EngToolBox

EngToolBox is an offline engineering and productivity app that brings calculators, technical tools, timers, and wellbeing features into one place. **Calculators** Includes basic arithmetic, binary, octal, hexadecimal, number base conversion, logarithmic and exponential calculations, symbolic mathematics, and numerical integration. **Engineering Lab** A collection of engineering tools and reference notes for technical calculations and learning. **Timers** Four timers for different tasks: Pomodoro, Focus Timer, Countdown, and Stopwatch with lap tracking. Supported timers also provide Live Activities on compatible iPhones. **Wellbeing** Daily Reset offers a quick personal check-in. Guided Breathing provides adjustable breathing exercises, while Desk Recovery offers short breaks for screen-heavy work. The Private Journal allows you to write and store personal entries locally. Entries are encrypted using Apple's CryptoKit, with encryption keys protected through Keychain. Access is secured using Face ID, Touch ID, or your device passcode. **Settings** Choose between Light and Dark Mode, customize supported sounds, and enable or disable haptic feedback. EngToolBox is designed to work offline, without requiring an internet connection for its core features. If you encounter a bug or have a suggestion, feel free to get in touch.