Help / FAQ

First the cable: connect the keyboard directly to the computer over USB (some hubs drop instruments). Then the browser: when Clef asks for MIDI access, allow it. If you dismissed the prompt, click the permission icon in the address bar and re-enable it. Finally, open Settings inside Clef and pick your device in the list, then press a key to confirm. A page refresh after plugging in helps on some systems.

Chrome, Edge, and Firefox. Clef listens to your keyboard through the browser's built-in support for talking to instruments (Web MIDI), which Safari doesn't have. Firefox asks you to approve a one-time permission for the site.

Not yet, and it isn't only a matter of building one: on iPhone and iPad, no browser can reach a connected piano at all. Clef runs on a laptop or desktop on or near your instrument.

Nearly every digital piano and keyboard made in the last two decades. If it has a USB port (often labeled 'USB to Host' or MIDI), or it already works with other music software, it works with Clef.

No. Clef needs to know exactly which keys you pressed and when, and only a direct connection to the instrument provides that reliably. Microphone support does not exist.

Green means you played what's written: the score lights up and moves forward. Red marks a wrong note at the exact spot in the score where it happened, so you always know precisely what went wrong and where.

No. Chords tolerate a natural amount of rolling, so quick arpeggiation within a short window counts as the chord.

By design. Practice mode gives you a metronome and lets you start from any bar; a from-memory review gives you a restart and a 'Show me' when you're stuck. There is no playback speed slider and no section looping: Clef keeps you playing rather than configuring.

After a miss, you re-practice that spot with the score visible. A pass is clean when you play the tested bar with no wrong notes; two clean passes in a row and the bar returns to the normal review schedule.

Checkpoints. Every few memorized bars, Clef has you play the whole stretch you have just learned in one run, from memory. Each stretch overlaps the one before it, so individual bars weld into one continuous performance instead of staying separate.

The catalog runs from beginner Bach and the Petzold minuets through Für Elise, Gymnopédie No. 1 and Clair de Lune, up to Chopin's études and La Campanella. Every piece is engraved and checked by hand before publishing, so it is curated rather than scraped, and it grows on request instead of all at once. The library page lists all of it: https://playclef.com/library/

No. You can request any piece from inside the app (title, composer, and a source link) and vote on other people's requests. Requests steer what gets curated next, and right now most of them are engraved and published within a day.

14 days, full product, no credit card required. Add a payment method if you want to keep practicing afterward; if you do nothing, the trial simply ends and you pay nothing. Details are on the pricing page.

From inside the app: your account's billing section opens the Stripe customer portal, where cancellation is two clicks. Your access continues to the end of the paid period.

Yes. A 30-day no-questions money-back guarantee covers your first paid month, and EU customers additionally have the statutory right of withdrawal. See the refund policy.

Yes. Accounts work with email and password or with 'Continue with Google'.

Open Settings → Account and choose Delete account. Clef emails a one-time link that you confirm while signed in to the same account. Access ends immediately and the privacy policy describes the limited records retained for legal obligations.

English and German, fully translated. You can switch in Settings.