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.
mention - Media monitoring made easy with Mention. Create alerts on your name, brand, competitors and be informed in real-time of any mention on the web and social networks
Habitica - Habitica is a free habit building and productivity application.
Critical Mention - Track. Measure. Share. Grow.
HabitBull - HabitBull
TVEyes - Founded in 1999, TVEyes' mission is to be the global search engine for TV and radio coverage. No matter where it appears in the world, if it aired on TV, you’ll find it on TVEyes.
Todoist - Todoist is a to-do list that helps you get organized, at work and in life.