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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.
Norwegian 4x4 Protocol - Download the Norwegian 4x4 App for scientifically-proven HIIT workouts. Transform your fitness with structured interval training. Available on iOS and Android.
Habitica - Habitica is a free habit building and productivity application.
Intervally - Interval Timer - Sport & Health
HabitBull - HabitBull
Love HIIT - Free exercise timer, share your workouts
Todoist - Todoist is a to-do list that helps you get organized, at work and in life.