[ SUPPORT ]
Supported Browsers & Compatibility
Age & Sleep Calculator works on modern browsers, with sensible fallbacks when advanced features are missing.
Supported browsers
We support the latest two versions of Chrome, Edge, Firefox, and Safari — on desktop, on iOS, and on Android. If you are running an older browser, the site should still work, but you may miss out on some conveniences and we cannot guarantee pixel-perfect layouts.
Feature notes
| Feature | Notes |
|---|---|
| Date inputs and time pickers | Uses native browser controls wherever they are available. |
| Clipboard API | Copy buttons require HTTPS (or localhost during development). |
| Web Share API | Available on most mobile browsers for sharing results natively. |
| Service workers / PWA | Require HTTPS. Supported in Safari 11.1+ and iOS Safari 11.3+. |
| localStorage | Supported in all supported browsers for the theme preference. |
Graceful degradation
If your browser does not support service workers, the site still works fully online — offline caching is simply skipped. If native date and time pickers are unavailable, plain text inputs are shown instead, and you can type a date in the format yyyy-mm-dd.
If something does not behave as expected in your browser, check the Help page first. Curious how offline mode works? See our Offline page.