Brain Bell is for every learner

What you can do

• Display settings (the Display button in the header): light, dark and high-contrast colors, three text sizes, wider letter and line spacing, and reduced motion.
• Read aloud: every question has a button that reads it out using your device's own voice.
• Extra time: when a teacher turns it on, any student can ask for double time on timed questions when they join. It is a private choice; the class sees only a small "Extra time on" note.
• Keyboard and switch access: everything works without a mouse. Ordering uses Move up and Move down buttons, so nothing needs dragging.
• Screen readers: questions, answers, scores and countdowns have text labels. Focus moves to the new heading when a screen changes, and feedback is announced.
• Not just color: answers are marked with letters, and correct answers are labeled in words as well as color.
• Zoom and small screens: text can be enlarged to 200% and pages reflow without sideways scrolling, down to 320 pixels wide.
• Any language: quizzes can be written in any script. Right-to-left text is shown in the right direction.

How we check

Every release is run through automated accessibility checks on the main pages in light, dark and high-contrast colors, and through keyboard-only and mobile-size tests in Chrome, Safari (WebKit) and Firefox. Automated checks cannot find every problem, so we also test by hand. We have not yet had an independent audit.

Known limits

• Live countdowns are visual and announced by screen readers only when you ask for the time. Use extra time, or ask your teacher to turn the timer off.
• Read aloud depends on voices installed on your device, so quality and language support vary.
• Questions are written by teachers. We cannot check that quizzes they write are accessible, but the editor encourages short, clear text.

Tell us about a problem

If something does not work for you, please let us know and we will try to fix it. Contact details will be listed here before launch. See also our privacy policy.