Stackling

Learn to buildapps by tapping.

Five-minute lessons from your first variable to web interfaces and native iOS apps. Tap and drag, no typing, no setup.

Start learning, freeI already have progress

No account needed · About 5 minutes

You won't type a line. You'll tap, drag and predict your way through real code, five minutes at a time.

A lesson, in motion

Predict the output.

Read a line of real code and guess what it prints.

Build it from tiles.

Tap the pieces into place. No typing, no syntax errors.

Match the pairs.

Connect each call to what it returns.

Get one wrong, see why.

A miss is a clue: you get the reason right away.

Finish the lesson.

Five minutes in, you have XP and something that stuck.

What does this print?

console.log("hello")
"hello"
hello
console.log
nothing

Create a variable called age that holds the number 30.

letage=30
30let"30"=age

Match each call to its result

Math.max(1, 5)
Math.min(1, 5)
Math.max(8, 3, 6)
Math.min(8, 3, 6)
3
8
1
5

What does this print?

console.log(42)
"42"
console
42
nothing
Not quite: 42.

console.log prints the value you give it. 42 is a number, so it prints 42.

Lesson complete!

+10 XP

Try one

What does this print?

console.log("hello")

Eight paths, one habit

Pick a road. Five minutes a day moves you along it.

  1. Frontend

    Web pages, JavaScript and React. Start here if you're new to code.

    4 tracks · 108 lessons

  2. Mobile

    Phone apps with React Native and iOS. Best after Frontend's React track.

    2 tracks · 118 lessons

  3. Backend

    Databases and APIs: SQL, Postgres, HTTP, auth, caching and operations.

    2 tracks · 136 lessons

  4. System Design

    The method, then interview classics broken down end to end. Best after Backend.

    2 tracks · 100 lessons

  5. Core Skills

    Data structures, how computers work, debugging and building with AI. Useful on any stack.

    4 tracks · 140 lessons

Beyond code

  1. Design

    See what makes a screen work and feel designed: hierarchy, type, colour, states, motion and the art behind them.

    5 tracks · 162 lessons

  2. Happiness

    What makes a life go well: the evidence, the old arguments, and what it means for your work. Not about code.

    6 tracks · 238 lessons

  3. Thinking Clearly

    How to judge a claim, read a number and make a call when you can't be sure. Not about code.

    2 tracks · 64 lessons
FundamentalsWebJS for the WebReactReact NativeiOSSQL & PostgresBackend & APIsDesign FoundationsProblem BreakdownsData structures & algorithmsCore CSDebuggingEngineering with AI
SeeingType and ColourStates and ContentInteraction and MotionSystems and ProductWhat happiness isGroundMindOthersMeaningWork and a lifeWhat clear thinking isNumbers

Built with what it teaches

Stackling is itself an Expo, React Native and TypeScript app, the stack its Mobile path teaches, with one codebase behind the web app at /learn.

Your first lesson is five minutes away.

Start learning