3′
Three to six minutes, start to finish
Every lesson is 8–12 cards — one hook, a few concepts, four or more things you actually do, one win. Short enough for a coffee queue. Complete enough to matter.
Core lessons free · No app store
Short, sharp lessons
Short, sharp lessons
for grown-ups.
reps. is a micro-learning app for adults. Three to six minutes, a handful of swipeable cards, one idea that sticks. 60 courses on money, technology and life — no fluff, no jargon, no 40-minute videos you never finish.
Works offline. Installs straight from your browser — no App Store, no download, no ads.
60Courses
372Lessons
3,670Cards
FreeCore lessons
The idea
Duolingo-style learning, but the content is adult.
Most "learning apps" for grown-ups are just videos with a quiz bolted on. reps. is built the other way round: you're doing something every card or two, and every lesson is engineered to land exactly one idea.
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It re-asks what you got wrong
Missed cards come back at the end of the lesson, then again after a day and after a week. Spaced repetition is doing the real work in the background.
★
Streaks, XP and a reason to return
Daily goals, streak freezes, credits, daily quests and speed challenges. The game layer exists for one reason: getting you to come back tomorrow.
Eleven kinds of card
You act every card or two.
Never two reading screens in a row. That's the whole mechanic.
Concept — the idea, in 240 characters
Multiple choice
Scenario — what would you actually do?
Numeric — type the answer on a keypad
Select all that apply
Fill in the blank
Sort into buckets
Tap the diagram
Order the steps
Speed round — 6 seconds a call
Win screen
The library
60 courses. 372 lessons. 346 hand-drawn diagrams.
Money, technology, building things, and the life skills nobody taught you. Every course is free to learn today, and new ones land regularly.
Build · Backend
Backend with Supabase
6 lessons
Build · Web
Build a Site with WordPress
6 lessons
Build · Edge
Cloudflare Basics
6 lessons
Build · Web Infrastructure
DNS & Domains
6 lessons
Build · Containers
Docker Essentials
6 lessons
Build · Version Control
Git & GitHub
6 lessons
Build · npm
npm & Packages
6 lessons
Build · Dev Environment
OrbStack on the Mac
6 lessons
Build · Deploy
Ship with Vercel
6 lessons
Build · Data
SQL Basics
6 lessons
Build · Payments
Stripe Payments
6 lessons
Engineering · Craft
Async & the Event Loop
6 lessons
Engineering · Delivery
CI/CD & Pipelines
6 lessons
Engineering · Craft
Code Review & Pull Requests
6 lessons
Engineering · Craft
Coding with AI Agents
6 lessons
Engineering · Craft
Data Structures in Practice
6 lessons
Engineering · Craft
Debugging & Reading Errors
6 lessons
Engineering · Craft
How Fast Is Your Code
6 lessons
Engineering · Craft
Naming, Functions & Refactoring
6 lessons
Engineering · Craft
Programming Basics
6 lessons
Engineering · Craft
Reading a Codebase You Didn't Write
6 lessons
Engineering · Systems
System Design Basics
6 lessons
Engineering · Craft
Testing & Confidence
6 lessons
Finance · Accounting
Accounting Fundamentals
7 lessons
Finance · Credit
Credit Scores & Reports
7 lessons
Finance · Crypto
Crypto & Blockchain Basics
6 lessons
Finance · Debt
Debt Payoff Planning
7 lessons
Finance · Budgeting
Family Budgeting
7 lessons
Finance · Housing
Home Buying, Demystified
6 lessons
Finance · Banking
How Banks & Interest Work
6 lessons
Finance · Taxes
Income Taxes 101
6 lessons
Finance · Economy
Inflation & the Economy
6 lessons
Finance · Insurance
Insurance Basics
7 lessons
Finance · Investing
Investing Fundamentals
7 lessons
Finance · Career
Job Offers & Equity
6 lessons
Finance · Behavior
Money Psychology
6 lessons
Finance · Retirement
Retirement & Compounding
6 lessons
Finance · Spending
Smart Spending & Big Purchases
6 lessons
Finance · Estate
Wills & Estate Basics
6 lessons
Life · Career
Everyday Negotiation
6 lessons
Tech · AI
AI Fluency
7 lessons
Tech · How It Works
APIs & GraphQL
7 lessons
Tech · How It Works
Backend Servers
7 lessons
Tech · Tools
Command Line Basics
6 lessons
Tech · Security
Cybersecurity for Everyone
7 lessons
Tech · Frontend
Frontend Fundamentals
6 lessons
Tech · Databases
How Databases Work
6 lessons
Tech · Security
How Login Works
6 lessons
Tech · How It Works
How the Web Works
7 lessons
Tech · Engineering
Logs, Metrics & Traces
6 lessons
Tech · Security
Passkeys & Modern Login
6 lessons
Tech · Security
Password Managers & 1Password
6 lessons
Tech · Web Apps
PWAs & Service Workers
6 lessons
Tech · Text Processing
Regex Basics
6 lessons
Tech · Spreadsheets
Spreadsheet Essentials
6 lessons
Tech · Hands-on
SSH & Remote Access
6 lessons
Tech · Stats
Statistics Without Tears
7 lessons
Tech · TypeScript
TypeScript Essentials
6 lessons
Tech · Security
When You Get Hacked
6 lessons
Tech · Hands-on
Working with APIs
6 lessons
Put it on your phone
reps. installs from your browser in about 20 seconds.
It's a Progressive Web App — a website that installs like a real app. No App Store, no Play Store, nothing to download. You get a home-screen icon, a full-screen app with no browser bars, and lessons that keep working with no signal. Start without an account; sign in once (email or Google) whenever you want your progress to follow you to every device.
iPhone & iPad
You must use Safari — on iOS, Chrome and Firefox can't install web apps.
- Open the app in Safari Go to app.reps.school
- Tap the Share button The square with an arrow at the bottom of the screen (or top-right on iPad).
- Scroll down to "Add to Home Screen" It's below the row of share targets, in the list with Bookmark and Find on Page.
- Tap "Add" Top-right corner. You can rename it first if you like.
- Open it from your home screen The reps. icon is now on your home screen and launches full-screen.
Android
Use Chrome (Samsung Internet, Edge and Brave work the same way).
- Open the app in Chrome Go to app.reps.school
- Look for the install prompt Chrome often shows an "Install app" banner on its own — if it does, tap it and you're done.
- Otherwise, open the menu Tap the ⋮ three dots in the top-right corner.
- Tap "Install app" or "Add to Home screen" The wording depends on your Chrome version — both do the same thing.
- Confirm with "Install" reps. lands in your app drawer and on your home screen like any other app.
On a laptop? In Chrome or Edge, open the app and click the small install icon (a monitor with a down-arrow) at the right-hand end of the address bar — or use the ⋮ menu → Cast, save and share → Install page as app. Safari on macOS: File → Add to Dock.
Questions
The short answers.
Is it actually free?
Yes. All 60 courses and all 372 lessons are free today — no ads, no trial timer, no credit card. If a paid tier ever arrives, the core lessons stay free.
Do I need an account?
Not to start — tap Try a lesson first and you're in. Sign in when you're ready (an email and a password, or Google): that's what carries your progress to other devices and puts you on the leaderboard. Until then it lives on the device you're using.
Does it work without signal?
Yes. Once installed, the whole app is cached on your device. Lessons, diagrams and your streak all work on a plane or in a basement; XP syncs the next time you're online.
Why isn't it in the App Store?
It doesn't need to be. reps. is a Progressive Web App: it installs directly from your browser, updates instantly with no download, and takes up a fraction of the space. Same icon on your home screen, same full-screen experience.
How long is a lesson, really?
Three to six minutes. Eight to twelve cards, and you're interacting on most of them. It's designed to be finishable in a queue — not something you have to schedule.
Is the finance content investment advice?
No. The money courses teach how things work — what a fee is, how compounding behaves, how a credit score is built. They never recommend a specific stock, fund or product, and they aren't a substitute for a professional who knows your situation.
Who makes this?
An independent developer, built for adults who want to actually understand things rather than watch a video about them. There's a kids' version too, called Batch.
A few minutes a day is a real education.
Pick a course, do one lesson, and see whether it sticks. Nothing to install first.