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

Hi HN! After ~9 months of development, I published my very first app to the App Store. It's called Checker, a habit/goal-tracking app that uses GitHub-style calendar grids to visualize your progress. It's relatively simple for now but I'll be adding quite a few features in the coming months, like board color themes, Apple Health integration, more widget styles, etc.

Hope you give it a try, and if you do, please let me know if you have any feedback.