Support

No. All calculations, the formula library, history, and settings work fully offline. An internet connection is only used by Firebase Analytics and Crashlytics for anonymous usage stats and crash reports.

All history is stored locally on your device in a SQLite database. It is never uploaded to any server. You can clear your history at any time from the History screen.

Open the App, tap the Settings icon, and choose from 5 themes: Light, Dark, Amoled Black, High Contrast, and Solarized. Your selection is saved automatically.

WeltekxCalc covers arithmetic, scientific functions, algebra (simplify, factor, solve), calculus (differentiate, integrate, limits), matrices, statistics (distributions, regression), financial maths (interest, NPV, IRR), CS math (base conversion, bitwise ops), discrete maths, and built-in physics constants.

Tap the formula icon from the main calculator screen. The library contains 96 searchable formulas across 8 categories: Algebra, Trigonometry, Calculus, Statistics, Geometry, Physics, Financial Mathematics, and Discrete Mathematics. Tap any formula to insert it into the calculator.

Crash reports are sent automatically via Firebase Crashlytics. If the issue persists, try clearing the App’s cache in your device settings. If it still crashes, contact us with your device model, Android version, and the steps before the crash.