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.
Flickr - image and video hosting website
HabitBull - HabitBull
Imgur - Imgur is a free and simple image hosting service with image editing feature. Signup is optional.
Todoist - Todoist is a to-do list that helps you get organized, at work and in life.
PhotoPrism.app - PhotoPrism® is an AI-Powered Photos App for the Decentralized Web. It makes use of the latest technologies to tag and find pictures automatically without getting in your way. You can run it at home, on a private server, or in the cloud.