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.
Iteration X - Iteration X allows teams to annotate and edit any live website or web app directly in Chrome.
Habitica - Habitica is a free habit building and productivity application.
Wized - Design your web application in Webflow, build it with Wized
HabitBull - HabitBull
Flycode - FlyCode (YC S22) makes web apps editable without coding so companies can iterate and release products faster - helping teams edit copy, images, and links in the code so their developers don’t have to.
Todoist - Todoist is a to-do list that helps you get organized, at work and in life.