Accessibility statement

What we aim for

Our target is the Web Content Accessibility Guidelines (WCAG) 2.2 at level AA, across the app and the website, and we check it automatically on every main screen.

How we check

Every main screen (home, the course and a lesson, the workout, a song and Sing, the studio and its sheets, Settings, sign-in and Contact us) is checked automatically on every change to the app: at phone, tablet and desktop widths, in light and dark, in both looks (game and serious), and with reduced motion on. We also go through it by keyboard. These are our own checks, not a formal audit or certification. What a screen reader announces while you sing, and where focus goes, is checked by automated tests; we haven't yet tried it with VoiceOver or TalkBack on real phones. This statement was last updated on 30 October 2026.

What the app does

• Contrast: text meets WCAG 2.2 AA contrast (4.5:1, and 3:1 for large text) in light and dark, in both looks.
• Keyboard: everything works from the keyboard, and focus is always visible. An open sheet keeps focus inside it until you close it, and Escape closes it. You can start a lesson and move through its steps by keyboard alone. In Sing and the studio, Space plays, or stops a recording, and the single-letter shortcuts (like R to record) can be turned off in Settings.
• Screen readers: every button, link and field has a name, and every picture has a text alternative. Each screen has one main region, its headings never skip a level, and its heading is also the tab's title. When you move to a new screen, focus moves to its heading, so your screen reader says where you are. While you sing, it speaks plainly and only when it matters: lesson 1 says what it hears once it settles, then names your note in one line; Sing says the count-in once and when recording starts, never every beat; and after a take, focus moves to its result, so the measure is read first. In the song editor, notes also have a list view.
• Not by colour alone: your pitch is also given in words and note names, like "Now G4, next F#4" and "On the note", and each part's colour is picked to stay distinct.
• Reduced motion: if your device asks for less motion, the app's animations (celebrations, moving lesson drawings and game effects) stay still, and nothing moves on its own while you're idle.
• Size and zoom: every control is at least 24 by 24 pixels, and most are 44 or more on phones. The app works from 320 pixels wide without scrolling sideways, and pinch zoom is never blocked.
• High contrast: Windows High Contrast (forced colours) is supported, and controls keep their borders and focus rings.
• Calmer or quieter: sounds and game effects can each be turned off, and the serious look drops stars, XP, badges and streaks.
• Captions: when a song has words, share videos can show them as they're sung, so they work with the sound off.
• Password managers work with our sign-in forms.

Where we know it falls short

• It's an audio app. Learning harmony means hearing the other parts and singing your own, and the feedback on your pitch comes from your microphone. Much of Stackapella will be of little use without hearing, or without a voice and a microphone.
• The note lane, waveforms and pitch line are drawn as pictures. Their main information is also in words, but a screen reader can't follow the picture note by note while you sing, and we haven't yet tested singing with VoiceOver or TalkBack users.
• Timing depends on your device. Speakers and headphones add a delay, which the timing check measures by playing short chirps into your microphone. If that fails, you can use your browser's own estimate instead, which can be tens of milliseconds off, and then move a part's timing by ear in the studio. Recording a guide voice needs the measured delay.
• No captions without words. A song with no words, or a share video made without them, has nothing to caption.
• English only, at launch.
• Content from others, such as coaches' voice notes and exercise packs, may not have a text version.

Tell us about a problem

If something stops you using Stackapella, or you need something in another form, please write to [email protected], or use Contact us in the app. Tell us what you were trying to do, and the device and browser you use. We aim to answer within 2 working days, and we'll tell you what we can fix and when.