The Public Shelf

A crisis directory for Fresno: real phone numbers for mental-health, trauma, crime-victim, and grief services — every one checked against its official source (September 2026).

Why it's public: The moment someone needs it most is the worst possible moment for a login wall.

Tracking, honestly: No account required. No personal data collected — it's a directory of other people's official services.

Novice-to-journeyman curriculum, California's real DIR certification roadmap (hours, exam blueprint), an Ohm's Law trainer, NEC sizing drills, and a 40-question practice quiz.

Why it's public: A trade can change a family's whole trajectory — this knowledge isn't mine to gate.

Tracking, honestly: No account required. Curriculum progress saves only in your own browser.

Drop photos in, get smaller ones out — JPEG, WebP, or AVIF, whichever measures smallest per image. Compression runs entirely in your browser; your photos never leave your device.

Why it's public: It costs almost nothing to give, and it's useful to almost everyone.

Tracking, honestly: No account required. The only log: anonymous counts (a visit, a compression, a download, and raw byte totals). No filenames, no photos, no accounts, no IPs.

Drop in two or more CSV files and see exactly which rows they share and which are unique to each — computed entirely in your browser. It can even export itself as one offline HTML file you keep forever.

Why it's public: It runs 100% on your machine, so charging for it would be a toll booth, not a price.

Tracking, honestly: No account required. Nothing uploads — files are read and compared in the tab; close it and everything is gone.

Letters and numbers for tiny kids — tap an A, hear it spoken in your device's own voice, see a friendly picture, count to 10 along with the app.

Why it's public: Every parent with a tablet deserves a tracker-free version.

Tracking, honestly: No account required, and no analytics at all. Play progress saves only in your own browser; nothing about your child is recorded anywhere.

Import a spreadsheet, get a privacy scan that flags likely personal-data columns (emails, phones, IDs), redact them, compute honest stats, and download an audit report — all in-browser.

Why it's public: A privacy tool that uploads your data to someone else's server would defeat itself.

Tracking, honestly: No account required. Files never leave your browser — every step runs locally and the report downloads straight from the tab.

A 3D voxel city you carve with a glowing slice plane — and the cross-section you cut is a real 2D platformer that morphs live as you drag the blade. Orbs, levels, and two dimensions in one screen.

Why it's public: It's a whole game-engine demo that costs nothing to share and never asks who you are.

Tracking, honestly: No account required. No analytics, no uploads, no saves at all — close the tab and it's gone.

Six snails, five biome circuits, 3D grand-prix racing with slipstream drafting, a top-down garden gauntlet, a driveable hub — and a daily time trial against the ghost of your own best run.

Why it's public: "Free-to-play" usually means free-to-be-tracked; this one is free the honest way.

Tracking, honestly: No account required. The daily ghost is your own recorded replay, kept only in your browser — nothing is sent anywhere.

A cozy 3D shift: sweep the whole street clean before the timer runs out, then watch the sun come up on your work.

Why it's public: A calm little game like this shouldn't need an account, a store, or a data policy.

Tracking, honestly: No account required. No analytics at all — nothing leaves the tab.

The classic block-stacking arcade in one canvas — tap to drop, trim your overhangs, and chase your own high score.

Why it's public: Some games are too small to gate and too universal to keep.

Tracking, honestly: No account required. No analytics, no uploads — everything stays in the tab.

Bumpers, flippers, a charge-up launch, three balls, and physics in a single canvas — a tiny, honest pinball table.

Why it's public: Classic arcade, zero strings — the way it always should have been.

Tracking, honestly: No account required. No analytics, no uploads — nothing is stored anywhere.

Pure reflex: slide left and right, outlast the swarm, and watch it speed up the longer you survive.

Why it's public: The simplest game on the shelf proves the point best — free means free.

Tracking, honestly: No account required. No analytics at all; close the tab and it forgets you.

The Big Three of geometry as things you can drag: a Pythagorean explorer with the squares drawn on the sides, parallel-line angle pairs that stay labeled, and congruence postulates you can break on purpose. Built around "experience first, formalize later" and "label everything."

Why it's public: Tutoring is one of the most monetizable things in education — this is the study-aid version, free on purpose.

Tracking, honestly: No account required, and no analytics at all — nothing leaves the tab.

Pick any hue, re-anchor the whole 12-step color wheel around it, and get exact harmony palettes — complementary, analogous, triadic, split-complementary, tetradic — computed live as you drag.

Why it's public: Design tools sit inside paid suites for the same wheel math; this one computes it in your browser and states what HSL rotation can't model.

Tracking, honestly: No account required. No analytics, no uploads — every palette is computed in the tab.

A deterministic physics simulation: four particles constrained to a superellipsoid surface, 60,000 timesteps, graphed and animatable — with a one-click export of the whole experiment as a standalone offline HTML file.

Why it's public: Modeling and simulation software sells licenses; this one runs in a tab and gives itself away.

Tracking, honestly: No account required. No analytics, no uploads — and the standalone export runs offline forever.

The childhood fold-and-cut paper craft, rebuilt in your browser: pick your folds, cut with your cursor, and watch the symmetry unfold live with every snip — then keep the flake as a PNG.

Why it's public: Every December somebody sells this exact joy as a kids' app; the craft belongs to everyone.

Tracking, honestly: No account required. No analytics, no uploads — the snowflake is drawn entirely in the tab and the PNG saves straight from it.

Pick any date — tonight, a birthday, a night you remember — and see the moon that hung there: phase drawn to scale, age in days, percent lit, and the next full and new moons.

Why it's public: The moon's phase is pure math anyone can run; putting it behind a paywall would be tolling the sky.

Tracking, honestly: No account required, no analytics — the phase is computed in your browser from the standard synodic-month formula.

Three free stations on one arcade floor: a Repair Bay that diagnoses anything broken and prices the fixes, an Explainer that explains any concept three ways (kid, adult, expert), and a Decision Bench that scores a life decision with an honest lean. Every answer is a flip-up cue card with the no-fibs limitations printed on the back.

Why it's public: Everyone breaks things, gets confused, and makes hard calls — those moments don't deserve a paywall.

Tracking, honestly: No account required. Anonymous counts only: a visit and which station ran — nothing you type is stored.

A binaural-beat workbench: pick a carrier and a beat, put on headphones, and each ear gets a slightly different pure tone synthesized live by your own browser. Add pink or brown noise and a timer.

Why it's public: Focus-sound apps charge subscriptions for sine waves; this one gives the waves away and says plainly that the research is mixed.

Tracking, honestly: No account required. No analytics, no uploads — every tone and every noise is generated locally by your browser's own audio engine.

A calm-down page for younger people: bubble wrap to pop, a guided 4-4-6 breathing animation, and a let-it-go list — type a worry, watch it float off the screen.

Why it's public: Young people deserve a place to breathe that doesn't ask who they are or sell them anything.

Tracking, honestly: No account required. Nothing is saved and nothing is sent anywhere — close the tab and it's gone.

An arcade game built from an original cosmology theory — five playable stages of the First Light narrative, and every stage carries a note grading the story against the real physics.

Why it's public: Creative cosmology should be playable — and a game brave enough to argue with itself in public is worth more than a quiet paywall.

Tracking, honestly: No account required. No analytics, no uploads — the only thing saved is your best score, in your own browser.

Three playable prototype games off a cue-card wall — pick one, choose its visual style, and AI-generated key art plus a director's brief finish the package while the game runs live in the canvas.

Why it's public: A game-engine demo is the best proof of what this app is — and proofs belong in the open.

Tracking, honestly: No account required. Nothing you play is saved anywhere; the key art is generated fresh per pick, never stored against you.

A calm desktop in your browser — a terminal, sticky notes, a focus timer, breathing rings, and wallpapers you pick. A whole operating system metaphor, without the account.

Why it's public: The app's OS metaphor deserves an open front door anyone can walk through and try.

Tracking, honestly: No account required. Wallpapers, notes, and timers save in your own browser's storage — nothing is sent anywhere.

Five more calm labs: a Rain Room with rain you synthesize and dial up and down, a Pebble Stack timing game, Thought Seeds prompts, a Ripple Pond, and a one-line journal — plus links to ten more public pages.

Why it's public: Calm software shouldn't come with a data plan attached.

Tracking, honestly: No account required. The journal and seeds save in your browser's localStorage only; scores stay on your screen; no server round-trips at all.

A public aerospace lab: draft parts with an AI CAD engine right on the page, then jump into every aerospace room this app already has — with each card honest about which rooms need a login.

Why it's public: Aerospace is the app's flagship trade — the door should be open to anyone curious enough to knock.

Tracking, honestly: No account required. Nothing you draft leaves the tab — and the page itself says the AI CAD drafts specs but verifies nothing.

Every playable game in the app on one page — 43 of them, free. Each card is honest about whether it opens with no account at all or just needs a free sign-in.

Why it's public: A game shelf you have to log into first isn't really a game shelf.

Tracking, honestly: No account required to browse. The open-play games collect nothing; the free-account games keep scores tied to an account you choose.

What The Human Brain App is, explained in plain English on one page — with AI-generated illustrations, real/invented/not-yet examples, and the honest limits said plainly.

Why it's public: If an app can't explain itself simply, it's hiding something.

Tracking, honestly: No account required. Nothing you do on this page is recorded — it's a static explainer.

Five in-browser brain exercises — reaction tap, Stroop, digit span, math sprint, sequence memory — each tracking your personal best, and each honest that a workout is a workout, not a medical assessment.

Why it's public: Brain training apps charge subscriptions for reaction timers; these run in a tab and keep your scores to yourself.

Tracking, honestly: No account required. Best scores save only in your own browser's storage — nothing is sent anywhere.

Every original theory in the app laid on one bench and matched against the cited science — each card carries sources and a self-audited verdict of supported, partial, or contradicted.

Why it's public: A theory that grades itself in public is worth more than one that never faces the evidence.

Tracking, honestly: No account required. No analytics, no uploads — it's a read-and-think page.

Historical figures famous for taking color too far — their obsessions, their eras, and an 'obsession score' the page itself labels as editorial opinion, never peer-reviewed data.

Why it's public: Color history is the most human part of color science — it belongs to everyone, not just subscribers.

Tracking, honestly: No account required. No analytics, no uploads — nothing you click is recorded.

An interactive stress-test of an original color-vision theory — cone-evolution timelines, brown-mixing demos, and naming hierarchies you can break on purpose, with the verdict stating exactly where the theory holds and where it fails.

Why it's public: Science done in the open, failures included, beats a quiet paywall every time.

Tracking, honestly: No account required. No analytics, no uploads — the experiments run entirely in the tab.

The pitch pages ask you to believe; this one asks for sixty seconds — a live Stroop test measuring your own reaction time, a color-harmony engine, and any night's moon, all running in your browser right now.

Why it's public: Proofs belong in the open — if the math is real, there's nothing to gate.

Tracking, honestly: No account required. Nothing is saved or sent anywhere — every demo computes locally.

Describe a product and get a blueprint, a 3D factory floor, a bill of materials, honest financials, and a listing draft — with the manufacturing bridge labeled plainly as a manual handoff, not a working pipeline.

Why it's public: The build-planning step is free because the planning is where everyone gets stuck.

Tracking, honestly: No account required. Nothing you design is stored server-side — the page runs in your tab.

Describe an app in a sentence and download a working single-file prototype you can open anywhere — honestly labeled a browser-only prototype, not a product with accounts or a database.

Why it's public: The first working thing you own should cost nothing but one sentence.

Tracking, honestly: No account required. Your idea and the prototype live in your tab — download it and it's yours.

Type what you want in plain words and watch a real, working app get built in front of you — the AI writes one complete HTML file, it runs in a sandboxed window on the page, and you keep it.

Why it's public: Making software looks like magic only when you can't see it happen — this pulls back the curtain for free.

Tracking, honestly: No account required. Nothing is saved on a server — one AI pass writes the file, and it's yours to keep.

Ten of the biggest open questions about the universe — consciousness, dark matter, the origin of life — each attempted live by the app and each honest about what's settled science and what's speculation.

Why it's public: The biggest questions shouldn't be locked behind the biggest paywall.

Tracking, honestly: No account required. No analytics, no uploads — it's a read-and-think page.

Ask the app anything and get an answer with an explicit confidence score — a structured, honest read of your question, labeled as structured thinking, never advice.

Why it's public: A second opinion on a hard call shouldn't require an account or a card.

Tracking, honestly: No account required. Nothing you ask is saved — the answer is generated, shown, and forgotten.

Place what you're trying to remember into rooms of a palace you design, then walk back through and collect it — the classic method-of-loci technique, built as a browser exercise.

Why it's public: Memory athletes have trained this way for two thousand years with pen and paper; a subscription adds nothing.

Tracking, honestly: No account required. Your palace and its items save only in your own browser's storage.

Log last night's hours and how you woke feeling, then see a 7-night average, a rough sleep-debt figure, and a 14-night chart — with the page itself saying the debt concept is debated.

Why it's public: Sleep tracking apps charge monthly for what is honestly a form and a subtraction.

Tracking, honestly: No account required. Your log lives only in your browser — clearing browser data clears it.

The notorious working-memory task: track a moving square AND spoken letters N turns back — at the same time. The hardest exercise on the shelf, kept honest by its own difficulty.

Why it's public: The most famous brain-training exercise in cognitive science shouldn't be the property of a subscription app.

Tracking, honestly: No account required. Nothing is stored at all — your score lives on the screen only.

Tap the instant the signal changes and measure your reaction time in milliseconds across tries — best, average, and trend kept in your own browser.

Why it's public: A reaction timer is a stopwatch; nobody should pay rent on a stopwatch.

Tracking, honestly: No account required. Your times save only in your browser's storage — nothing is sent anywhere.

The classic color-word interference test: name the ink color while the word fights it — and see your own interference cost in milliseconds, computed live.

Why it's public: Psychology's most replicated demo belongs in the open, where anyone can run it on themselves.

Tracking, honestly: No account required. Nothing is stored — each run lives on the screen only.

Digits appear, then vanish — type back what you saw, forward or backward. It climbs until you miss, and your best span is kept in your browser.

Why it's public: A working-memory benchmark that's one input box and a counter shouldn't need a card on file.

Tracking, honestly: No account required. Your best span saves only in your own browser's storage.

Timed mental-arithmetic sprints at rising difficulty — addition, subtraction, multiplication, division — with your pace and accuracy tracked per session.

Why it's public: Mental math is free to practice everywhere except inside paid apps; this fixes that.

Tracking, honestly: No account required. Session history saves only in your browser's storage.

A focus timer with work/break cycles and a session log — start a sprint, take the break it gives you, and see your focused time build up over days.

Why it's public: Pomodoro is a technique, not a service — the timer belongs to whoever needs it.

Tracking, honestly: No account required. Your sessions save only in your browser's storage.

Paste a paragraph and it flags common fallacy patterns — ad hominem, strawman, slippery slope, false dichotomy — naming each match. It calls itself a dumb keyword matcher, because it is one.

Why it's public: An argument-checking nudge should be as free as the bad arguments it catches.

Tracking, honestly: No account required. Your text is scanned in the tab and never sent anywhere.

List your options, list your criteria, weight them, score each option — and get a ranked decision where the math makes your own assumptions explicit instead of hiding them.

Why it's public: The tool that surfaces what you actually value works the same whether or not you logged in.

Tracking, honestly: No account required. Options, criteria, and scores save only in your browser's storage.

Pick a topic, explain it in plain words as if to a kid, then grade your own honesty against a short checklist — the gaps you can't explain are the gaps you haven't learned.

Why it's public: A study method that's a century of common sense shouldn't sit behind a subscription.

Tracking, honestly: No account required. Your explanations save only in your browser's storage.

The classic three-part note page — cue column, notes, and a summary you write after — kept as a growing set of notes you can reread.

Why it's public: Good note-taking is a skill, not a product.

Tracking, honestly: No account required. Notes save only in your browser's storage; nothing is uploaded.

Paste any text and it blanks out words at a gap you choose, turning your own reading into a fill-in-the-blank self-test.

Why it's public: Active recall works on whatever you're actually studying — so the text should stay yours.

Tracking, honestly: No account required. The text you paste is processed in the tab and never sent anywhere.

Add ideas as nodes and link them to each other to build your own map of how a subject fits together.

Why it's public: Seeing how ideas connect is how they stick — and it needs nothing but a browser.

Tracking, honestly: No account required. Your map saves only in your browser's storage.

Make your own flashcards and review what's due on an SM-2 schedule — cards you know return less often, cards you miss come back sooner.

Why it's public: The scheduling algorithm is decades old and public; a flashcard deck shouldn't be a paywalled app.

Tracking, honestly: No account required. Your deck and schedule live only in your browser's storage.

A word of the day with an honest "I knew it" button — it tracks the words you really knew, not the ones you scrolled past.

Why it's public: Learning a word shouldn't require handing over an email.

Tracking, honestly: No account required. Known words and your streak save only in your browser's storage.

A timed word-generation task: name as many words as you can in a category or starting with a letter, then see your count.

Why it's public: It's a classic, free-to-run cognitive task — no reason to gate a stopwatch and a text box.

Tracking, honestly: No account required. Nothing is sent anywhere.

Flip through the named thinking traps — anchoring, confirmation bias, and more — and mark the ones you now recognize.

Why it's public: Knowing the name of a trap is the first step to spotting it; that knowledge is public.

Tracking, honestly: No account required. Which cards you've marked known saves only in your browser's storage.

Short quizzes on common statistics traps — misleading averages, correlation vs. causation, cherry-picked samples — with your score at the end.

Why it's public: Reading numbers critically protects people; it shouldn't be a premium feature.

Tracking, honestly: No account required. Your score isn't saved or sent anywhere.

Map a whole day in 30-minute blocks — sleep, work, scrolling, whatever it was — and see where the hours actually went.

Why it's public: An honest look at your day needs a grid, not a data-harvesting dashboard.

Tracking, honestly: No account required. Your day grid saves only in your browser's storage.

Log what you read, then honestly self-check what stuck — a reading tracker that measures remembering, not pages turned.

Why it's public: Remembering what you read is the whole point; the tracker shouldn't cost more than the books.

Tracking, honestly: No account required. Your reading log saves only in your browser's storage.

A daily ergonomic self-check you score yourself — workstation, breaks, and habits, with an honest running score.

Why it's public: Better desk habits shouldn't come bundled with a subscription.

Tracking, honestly: No account required. Your checks save only in your browser's storage.

The study techniques that actually survived real research — spaced practice, retrieval, interleaving — with real citations, and the popular fads called out honestly.

Why it's public: Evidence about learning should be as free as the learning.

Tracking, honestly: No account required. Nothing is saved or sent anywhere.

A self-assessment of your study preferences that is honest about the research: matching lessons to a 'style' doesn't improve learning — and it says so.

Why it's public: A myth-busting tool that hides behind a paywall would undercut its own honesty.

Tracking, honestly: No account required. Your answers save only in your browser's storage.

Water tracking without the '8 glasses' gospel — log your drinks and get your own honest picture, not a marketing target.

Why it's public: Drinking water is free; tracking it should be too.

Tracking, honestly: No account required. Your log saves only in your browser's storage.

Log your mood and the day's weather over time, then see YOUR personal correlation — not a claim about people in general.

Why it's public: It's your data and your weather; the tool just does the arithmetic.

Tracking, honestly: No account required. Your daily logs save only in your browser's storage.

Map your handedness and side preferences, then measure your own tap-speed asymmetry with a short test.

Why it's public: A stopwatch test and a checklist — nothing here needs an account.

Tracking, honestly: No account required. Nothing is saved or sent anywhere.

Meet five short spoken sentences, wait, then pick each voice out of a lineup — a memory game built on pre-recorded audio.

Why it's public: A listening game like this runs on files and a timer; there's nothing to gate.

Tracking, honestly: No account required. Nothing is saved or sent anywhere.

Study a synthetic week of lunches, pause, then recall what was eaten — a short-term memory experiment with no real meals or real people.

Why it's public: It's a psychology-class demo, and class demos belong in the open.

Tracking, honestly: No account required. Nothing is saved or sent anywhere.

Read six low-intensity AI-generated faces and see where your reads and the generator's intent part ways — a small perception study, honestly labeled as generated.

Why it's public: A tiny perception experiment should be free the way the science behind it is.

Tracking, honestly: No account required. Nothing is saved or sent anywhere.

Log your doses and see the real half-life decay curve of the caffeine still in your system — no crash-prediction magic.

Why it's public: A decay curve is middle-school math; the tool shouldn't pretend otherwise or charge for it.

Tracking, honestly: No account required. Your log saves only in your browser's storage.

Log your cold showers or plunges with an honest evidence note alongside — the app tracks your streak, it doesn't sell you a health claim.

Why it's public: The evidence on cold exposure is genuinely mixed; a tracker shouldn't be the thing pretending otherwise.

Tracking, honestly: No account required. Your session log saves only in your browser's storage.

A timed writing sprint that keeps the pen moving — set minutes, type, and keep your entries to reread later.

Why it's public: Freewriting needs a timer and a box, and both are free.

Tracking, honestly: No account required. Your entries save only in your browser's storage.

Track daily habits with honest streaks — miss a day and the streak says so, like a real streak should.

Why it's public: A habit tracker is a calendar with a checkbox; it doesn't need a login.

Tracking, honestly: No account required. Habits and your log save only in your browser's storage.

Pick the state you're in and get a search starter for music that tends to fit it — a nudge, not a diagnosis, and it plays nothing for you.

Why it's public: It hands you a search phrase, not a service — so it has nothing to charge for.

Tracking, honestly: No account required. Nothing is saved or sent anywhere.

List assets and liabilities, get one number — a point-in-time snapshot you take yourself, kept entirely on your side.

Why it's public: Your finances shouldn't have to leave your device to be organized.

Tracking, honestly: No account required. Your lists save only in your browser's storage — never uploaded.

List upcoming bills with due dates and amounts, and see days-until-due at a glance.

Why it's public: Remembering your own bills is personal bookkeeping — it stays personal here.

Tracking, honestly: No account required. Your bills save only in your browser's storage — never uploaded.

Log expenses with a category and see the current month broken down by category.

Why it's public: A spending ledger works the same on your device as on someone else's server — one of those is private.

Tracking, honestly: No account required. Your log saves only in your browser's storage — never uploaded.

Six honest questions about anything you're learning — what you know, what's shaky, how you'd explain it to a kid, and what would change your mind.

Why it's public: The best tutor doesn't answer — it asks. Now the asking is free.

Tracking, honestly: No account required. Answers save only in your browser's storage — never uploaded.

Rewrite a passage in your own words, then the page flags any shared phrases of five or more words — the honest check on whether you really understood it.

Why it's public: The difference between reading and learning is a rewrite.

Tracking, honestly: No account required. The overlap check runs entirely in the tab; your text saves only in your browser.

Break an unanswerable question into a chain of guesses, multiply, and see how close you land in orders of magnitude — with preset problems to start from.

Why it's public: Estimation is thinking in public with numbers, and it shouldn't cost anything.

Tracking, honestly: No account required. Nothing saves at all — reload and the lab forgets you.

A random shape appears in one orientation — see the rotation in your head, then rotate until it matches the target. Streaks included, clinical claims not.

Why it's public: A classic spatial-reasoning exercise, free of the standardized-test price tag.

Tracking, honestly: No account required. Only your best streak saves, in your browser.

Empty everything circling in your head onto one page — one item at a time, dated, sortable, and then sorted into actions, worries, and noise.

Why it's public: Offloading open loops is the cheapest mind-clearing there is.

Tracking, honestly: No account required. Entries save only in your browser's storage — never uploaded.

Every 20 minutes of screen time, the timer calls a 20-second distant-gaze break — plus a 60-second blink check and an honest note on what the rule can and can't do.

Why it's public: The simplest eye-strain habit known, free of an app-store subscription.

Tracking, honestly: No account required. Break counts save only in your browser.

Log the last 7 nights against your own target and see the honest arithmetic — with a straight answer about what 'catch-up sleep' can and cannot repay.

Why it's public: Sleep math is subtraction; nobody should pay to see their own numbers.

Tracking, honestly: No account required. Entries save only in your browser's storage — never uploaded.

Log outdoor daylight minutes, morning versus later, and watch your week chart itself — with the window-vs-outdoors honesty baked in.

Why it's public: Most people get a fraction of the daylight they assume; seeing it is free.

Tracking, honestly: No account required. Entries save only in your browser's storage — never uploaded.

A guided six-move desk stretch — 30 seconds each, with plain-language instructions and an honest note about what stretching actually relieves.

Why it's public: A desk-break routine is a gift, not a product.

Tracking, honestly: No account required. Session count saves only in your browser.

Rate your energy 1–5 across six points of the day; after a few days, your personal curve emerges — and you plan hard work around your real peak, not a cliché.

Why it's public: Chronotype quizzes sell personality; your own data beats a quiz.

Tracking, honestly: No account required. Ratings save only in your browser's storage — never uploaded.

Six tasks, ranked, worked strictly top-down with no skipping ahead — the century-old rule that forces you to admit what matters, with the origin story honestly flagged as folklore.

Why it's public: A 1918 productivity rule costs nothing and has no upsell.

Tracking, honestly: No account required. Lists save only in your browser's storage — never uploaded.

Dump a task pile, then split every item: under two minutes (batched into a queue you do in one sitting) or bigger (promoted to a list that needs real calendar slots).

Why it's public: The most useful sorting rule in productivity, minus the course it usually comes inside.

Tracking, honestly: No account required. Your pile saves only in your browser's storage — never uploaded.

Every time you notice you've drifted, one tap logs what pulled you. The tally builds itself — and the honest fix is moving the pull, not summoning willpower.

Why it's public: Self-knowledge about your own attention shouldn't be a paid feature.

Tracking, honestly: No account required. The log saves only in your browser's storage — never uploaded.

Write the worry, box it, and only open the box at your scheduled 15-minute worry window — with an outcome ledger that counts how many worries resolved without your attention.

Why it's public: Scheduled worry time is a real CBT technique; a version of it should be free.

Tracking, honestly: No account required. Entries save only in your browser's storage — never uploaded.

For one avoided task: the first physical step, the feeling attached to it, and the smallest five-minute version — then archive it when you've started.

Why it's public: Procrastination is emotion regulation, and the decomposition prompts are public knowledge.

Tracking, honestly: No account required. Sessions save only in your browser's storage — never uploaded.

Principal, monthly addition, an assumed rate, years — and a chart of the gap between what you put in and what the assumption produces, with volatility and inflation named.

Why it's public: The most important chart in personal finance, free of the product it usually sells.

Tracking, honestly: No account required. Nothing saves — reload and it resets.

List your debts, pick avalanche or snowball, and simulate month by month — months to freedom, interest paid, and knock-out order. Flags debts whose minimums can't cover interest.

Why it's public: A payoff simulator is arithmetic; it shouldn't be behind a credit-card ad.

Tracking, honestly: No account required. Your list saves only in your browser's storage — never uploaded.

Every recurring charge on one page: monthly cost, the yearly truth, and the honest per-use price — with a flag for anything over $10 every time you use it.

Why it's public: Per-use cost is the number subscriptions hope you never compute.

Tracking, honestly: No account required. Your list saves only in your browser's storage — never uploaded.

The WWII bomber puzzle, interactive: where returning planes were shot, where the armor actually goes, and why every success story is a returning-bomber map.

Why it's public: The most useful thinking error to know, taught for free.

Tracking, honestly: No account required. Nothing saves — reload and the lab forgets you.

Play the three-door problem by hand with a running stay-vs-switch win record, then let the machine simulate 10,000 rounds and prove why switching wins twice as often.

Why it's public: The most counterintuitive result in probability, free of any course paywall.

Tracking, honestly: No account required. Your play record saves only in your browser.