Koda

Koda combines habits, tasks and a calendar into one heatmap-grid view, built around the small-daily-actions idea from Atomic Habits rather than long to-do lists. The interface is intentionally plain: a calm, distraction-free grid instead of gamified streak pressure.

It works offline and is free to use, with optional Pro features for people who want more. Koda is an Android app today, with iOS listed as coming soon.