I guess it's really safe cause it's open source, you can make notes on your habits but don't really do that. Its simple. Really fast. Haven't found a way to connect it to notion. In general it's a great app to track you habits. Does its job. Not more, not less.
No Zero Days - Foster personal growth and be someone you're proud of 🙌
Habitica - Habitica is a free habit building and productivity application.
stickK - stickK enables users to form commitment contracts to help them achieve their personal goals.
HabitBull - HabitBull
Habit List - Create good habits and break bad ones with the app that keeps you focused.
Todoist - Todoist is a to-do list that helps you get organized, at work and in life.