Echo

Spaced-repetition review that meets you where you practice.

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Write your cards in the browser. Or start from a deck somebody already built.

Review

A handful of cards surface the moment they're ripe, then get out of your way.

Answer

Answers save on the spot and sync after. Desk, phone, offline train — one history.

A card can be more than a question

A shape on the neck, a passage to play, a character you either know or you don’t. One deck holds all of them, and the schedule behind them is the same.

Fretboard shape

A minor pentatonic, fifth position

5678

Answered by tapping the neck. Every position is checked, roots included.

Piano passage

Play bars 1–8

Beethoven, Op. 27 No. 2. Loop it, or take it at half speed.

Q&A

What does this mean?

xué — to learn, to study. Type it, or just say whether you knew it.

Whether you’re studying a language, working towards an exam, or picking apart an awkward bar of guitar or piano, there’s a card type shaped like what you’re practising.

Why spaced repetition

Anything worth knowing is forgotten on a curve, and re-reading it isn’t what stops that — being asked for it is. Six cards, exactly as they’d arrive.

How memory works1 / 6
Recall

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Read any of them right now — every card, no account. Add one in a click when you want it coming back. Your progress stays yours.

Review anywhere

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Start with one deck.

Ten cards is enough to feel the difference in a week.