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offline-app

Offline voice changer app for Android and iOS with 24 voice presets (Helium, Robot, Demon, Ghost, Megaphone, Telephone and more), drag-and-drop effect chain, pitch/reverb/echo/distortion sliders, recording, audio import, direct sharing to WhatsApp/Telegram/Discord. Built with Flutter, native DSP. No ads, no internet, no tracking. Free download on Google Play and the App Store.

Fast offline percentage calculator for Android and iOS. Task-shaped templates for sale price, original price, discount, markup, margin, VAT, percentage change, reverse percentage, tip split, compound growth, and percentage points. Built with Flutter. Free, no ads, no tracking, no account. Free download on Google Play and the App Store.

Offline trip cost calculator for Android and iOS. Compute fuel costs from distance + consumption + price, split gas between carpool passengers, add tolls and parking, save vehicles and routes, review trip history. Both metric (km, L/100 km) and imperial (mi, mpg) units. Built with Flutter. No ads, no tracking, no account, no cloud sync. Free download on Google Play and the App Store.

Offline compass app for Android and iOS with True North (magnetic declination via World Magnetic Model 2025), real-time microtesla field-strength meter, magnetic interference detection, and Pin Direction bearing lock. Built with Flutter. No ads, no tracking, fully offline. Free download on Google Play and the App Store.

Simple Android App for MKU Christian Union