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.
Less - Less extends CSS with dynamic behavior such as variables, mixins, operations and functions. Less runs on both the server-side (with Node. js and Rhino) or client-side (modern browsers only).
HabitBull - HabitBull
DrinkControl - iPhone app for tracking and moderating alcohol use
Todoist - Todoist is a to-do list that helps you get organized, at work and in life.
Sunnyside - Mindful Drinking - Sunnyside helps anyone who regularly drinks alcohol to build mindfulness and intentionality around when and how much they drink.