Questions
The ones worth answering before you spend any time in the app.
What does it cost?
Nothing, for everything the app does today — no account, no card and no trial period. If accounts and sync ever get built they’ll need a server, and that part might cost something. Pricing has the details.
Do I need an account?
No. There isn’t one to make — you open the page and start playing.
Where are my chords and sheets stored?
In your browser, in local storage. Nothing is uploaded to a server, and that cuts both ways: it also means nothing is backed up.
If you clear your browsing data, use private browsing, or switch to another browser or device, your sheets won’t be there. Export anything you’d be upset to lose as a PDF. Real backup and sync would need an account, which is the main reason one might eventually exist.
Does it work on a phone?
Yes, and it’s the same app rather than a reduced one. The keyboard scrolls sideways, saved chords sit in a tray under the sheet instead of a side panel, and the controls are sized for fingers. Long-press a chord card to drag it.
Which browsers work?
Recent Chrome, Firefox, Safari and Edge, on desktop and mobile. Safari gets tested on a real WebKit engine rather than a phone emulator in Chrome, because that difference once hid a bug that left the piano completely dead in Safari for a whole release.
Can I plug in a MIDI keyboard?
Not yet. Input today is mouse, touch and the computer keyboard, which has the full three-octave range mapped to it. MIDI would be a sensible thing to add and it isn’t in the app.
Does it need to be online?
Only for the piano sound. Chord detection is calculated in the page and works straight away. The sampled piano is about a megabyte of audio that downloads in the background, and if it hasn’t arrived — or you’re offline — the keyboard still works and still names chords. It goes silent, not dead.
How many notes does it need to name a chord?
Three. Two notes is an interval, and there isn’t enough information in one to name a chord confidently. When several names fit, the alternatives are shown next to the main one.
Can I print a sheet?
Yes. Export produces a PDF with a small keyboard diagram for every chord, laid out by section. It prints readably in black and white.
Who makes this?
One person, in their own time. It isn’t a company, and there isn’t a team behind the word “we”.