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.
MCS-rm - MCS-rm is a rental management software that manages and controls the efficiency & profitability of hire operation.
Habitica - Habitica is a free habit building and productivity application.
ProdEval - At tcwsoftware.
HabitBull - HabitBull
Pandell PA - Pandell PA is a production accounting software that offers remote-user convenience, automated government reporting, data integration and personalized product support.
Todoist - Todoist is a to-do list that helps you get organized, at work and in life.