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.
Habitica - Habitica is a free habit building and productivity application.
HiHello - Exchange contacts, seamlessly.
HabitBull - HabitBull
100AM - Next gen business cards: always up-to-date, bright design
Todoist - Todoist is a to-do list that helps you get organized, at work and in life.
PING - PING (Partimage Is Not Ghost) is a free software Linux-based live CD ISO built upon the partimage...