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.
Creator - Robot-made burgers 🍔
HabitBull - HabitBull
Foodcratic - Find places with good food. Who cares about everything else.
Todoist - Todoist is a to-do list that helps you get organized, at work and in life.
Impossible Burger - A burger made from plants for people who love meat.