GeoToolbox

Geo Toolbox is an offline geography studio for students and curious travelers. Convert coordinates, estimate distances and day length, compare city time zones, look up climate belts, quiz yourself, and keep private study notes—without an account, ads, or the cloud. WHY GEO TOOLBOX • 100% offline — works in airplane mode • Zero data collection — no tracking SDKs • No login, no ads, no in-app purchases • Built for learning, not professional surveying TOOLS • Lat/Lon Converter — switch between decimal degrees and DMS; North/South & East/West; Beijing & Shanghai examples • Great-Circle Distance — Haversine two-point distance in km, miles, or nautical miles • Time Zone Diff — compare cities with built-in UTC offsets (standard time; no daylight saving in V1.0) • Day Length — estimate sunrise, sunset, and daylight from latitude, longitude, and date, with a sun-path sketch • Climate Zones — classify latitude into tropical, subtropical, temperate, subarctic, or polar belts LEARN • Offline encyclopedia with search across coordinates, time, climate, and astronomy basics • Quiz bank in four categories with shuffled questions and local explanations NOTES • Create, edit, search, and delete geography notes on device • Optional coordinates, tags, and categories • Stored in local SQLite — uninstall clears your notes SETTINGS & TRANSPARENCY • Default distance units and 12/24-hour time • Clear local notes cache • In-app Privacy Notice, Terms, and About — plus How it works guides on every major screen IMPORTANT Results are theoretical offline estimates for geography homework and learning. Geo Toolbox is not a professional surveying, navigation, or meteorological instrument. Privacy: This app does not collect user data and does not request Location, Photos, Microphone, or Tracking permissions.