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World Clocks
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Time Shifter
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▶ Use ZoneSync offline & install on your phone

ZoneSync is a Progressive Web App (PWA) — you can install it on your phone's home screen and use it completely offline, with no app store required.

iPhone / iPad (Safari)

  1. Open this page in Safari
  2. Tap the Share button (box with arrow)
  3. Scroll down and tap "Add to Home Screen"
  4. Tap Add — done!

Android (Chrome)

  1. Open this page in Chrome
  2. Tap the ⋮ menu (top right)
  3. Tap "Add to Home Screen" or "Install App"
  4. Tap Add — done!
Once installed, ZoneSync works fully offline. Your saved clocks are stored on your device and persist between sessions.