Show HN: Habit-tracking app with GitHub-style grids

Checker is an iOS app designed to help users track and visualize their progress towards various goals, promoting accountability and motivation. Users can create boards for specific goals and check in whenever they make progress, with the frequency of check-ins making the corresponding cell more prominent on a visual grid. This feature allows users to identify gaps or hotspots in their progress over time. The app supports tracking various metrics, including time, distance, volume, mass, calories, money, percentages, and plain numbers.

Checker prioritizes user privacy by not collecting personal data; all information is stored locally on the device. The app is developed with user experience in mind, featuring a dark theme and a roadmap for future enhancements, such as additional tracking options, custom units, and Apple Health integration. Users can create up to three boards for free, with a one-time payment required to unlock unlimited boards. The app is ad-free, ensuring a clean user experience. Currently, Checker is only available for Apple platforms, with no plans for an Android version. The app is created by Mykola Harmash, emphasizing a user-centric approach in its design and functionality.