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.
Simply.Digital - Goals & Tasks - Todo list to track your time & help set meaningful deadlines
Habitica - Habitica is a free habit building and productivity application.
Event Calendar App - A simple, easy to manage, way of displaying events
Todoist - Todoist is a to-do list that helps you get organized, at work and in life.
Thrive - Thrive is an intuitive tool to manage your business using the latest trends in Project Management, Dashboards, Customer Relationship Management & Accounting
HabitBull - HabitBull