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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.
Productivity.so - Shortcuts and hacks for your favorite tools
Habitica - Habitica is a free habit building and productivity application.
My Daily Planner - Organize your day with pen & paper. Free printable template.
HabitBull - HabitBull
Productivity Tools by Dropbox - Scan, share, collaborate & provide feedback on your ideas
Todoist - Todoist is a to-do list that helps you get organized, at work and in life.