simplesolat

Prayer times app with auto-updating widgets. Works worldwide.

Free, no ads.

Features

• All 7 prayer times including Imsak and Syuruk
• Swipe to see tomorrow's prayer times
• Qibla compass
• Home screen widgets (multiple styles, dark mode)
• Automatic zone detection via GPS
• Official prayer time data for supported countries
• Client-side calculation fallback for unsupported regions
• Works offline after initial setup

See Architecture for details on how the app works internally.

How Zone Resolution Works

When the app detects your GPS location, it determines your prayer zone using a country-first approach:

1. Country detection — Bundled Natural Earth ADM0 geojson → country ISO code
2. Official zone lookup — For supported countries (driven by countries.yaml), geojson + mapping files are fetched from CDN and cached locally. Point-in-polygon lookup resolves the exact zone.
3. Calculated fallback — For unsupported countries, prayer times are calculated locally using adhan-js with region-appropriate methods.

Supported countries are managed in the simplesolat-data repo. Adding a new country requires no app update.

Calculation Fallback (Worldwide)

For countries without official data sources, prayer times are calculated client-side using adhan-js. See simplesolat-data README for the full method table.

All calculations use Shafi madhab for Asr timing. Imsak is derived as Fajr minus 10 minutes.

Development

npm install
npx expo start

Data Sources

• Prayer times (official): simplesolat-data — aggregates from JAKIM, MUIS, Kemenag, KHEU, ACJU, and more
• Prayer times (worldwide): adhan-js (client-side calculation)
• Zone boundaries: geoBoundaries (CC-BY 4.0)
• Country boundaries: Natural Earth (public domain)