OpenHabit

The bot keeps the loop a habit tracker needs and nothing else: you define what you want to do and how often — daily, on set weekdays, monthly, or a custom pattern — and each day you mark it done. The history becomes a heatmap and a streak counter, which is the part that actually keeps people going, and a short note can be attached to a day when the number alone would not tell you why the week broke down.

Reminders are set per habit rather than globally, so the morning stretch and the evening reading do not share one alarm. The project is open source under the MIT licence and can be run on your own server with Docker, which matters for something that accumulates a year of personal data. The core is free with no cap on habits; a Premium tier adds an AI digest of your patterns, several reminders for one habit and CSV export, with a 14-day trial that does not ask for a card.