Skip to content

Don't rewatch.
Train.

AI turns any educational video into a course: questions inside the player, wrong answers rewind to the exact spot.

Start training freeSee pricing
Interactive demo. The answers are clickable.03:41
Video frame from the JSConf talk about the JavaScript event loop
What the heck is the event loop anyway?Chapter 1 of 4
 

Checkpoint. What does this print?

log("1"); setTimeout(() => log("2")); log("3");
1 · Call stack2 · Event loop, locked

Not a player. A trainer.

The video asks the questions

Chapters get cut automatically. The player pauses itself at checkpoints. You never decide when to test yourself.

Six ways to ask

The player never repeats itself twice in a row.

QuizFlashcardsRetellDrawingDiagramPredict next part

Rewind to the eureka moment

AI finds the exact 30-second segment instead of saying «watch it again».

Ch 1Ch 2Ch 3Boss

Chapters unlock like a map

Weak answers hide what's next, strong ones unlock an insider take.

useEffect
useMemo

Per-concept progress

Not «53% of the course»: useEffect 30%, useMemo 80%.

A boss-fight at the end

Coding videos end in a browser editor with Jest tests: no pass without green. Everything else gets a final exam graded by AI.

8 tests passed

Three steps from link to course

  1. 1

    Paste a link

    YouTube, Vimeo, direct .mp4. Captions or not: Whisper picks up videos up to 140 min.

  2. 2

    AI builds the course in 60s

    Chapters, varied checkpoints, secret branches, a final boss-fight.

  3. 3

    Learn and see your gaps

    Player pauses on questions. Wrong answers rewind. A health bar shows where you're weak.

Ready to learn the way they should've taught from day one?

Paste a link, get a course, start training for free. Upgrade when you outgrow 30-minute videos.

Start training freeSee pricing