ZONEFUL

Celestify

About this app

ZONEFUL is the dead-simple world clock. Add the people and places you care
about, and instantly see their local time and exactly how far ahead or behind
they are from you. That's the whole app — and that's the point.

WHY ZONEFUL
• One single screen — no tabs, no menus, nothing to dig through.
• Zero setup — no sign-up, no onboarding, no settings to wrestle with.
• Add a zone in about five seconds — search a city, tap it, done.
• Reads itself — plain "3h ahead" and "2h behind", no UTC math.
• Day awareness — a clear hint when a place is already on Tomorrow or Yesterday.
• 100+ cities — a searchable picker covering every continent.

PRIVATE BY DEFAULT
Everything is stored on your device. No account, no servers, no tracking, no
ads. ZONEFUL works fully offline and follows your system light/dark mode.

Stop doing time-zone math in your head. Add a place once and never guess again.

What’s new

ZONEFUL is here.

Add the people and places you care about and instantly see their local time, plus exactly how far ahead or behind they are from you.

No setup. No account. No clutter. Just a dead-simple world clock that helps you stop doing time-zone math in your head.