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.
Day One - A simple journal application for the Mac, iPhone, and iPad. AboutTo learn more about Day One, see these two excellent reviews . PublishPublish is not available in Day One 2.
Habitica - Habitica is a free habit building and productivity application.
Journey - A diary that keeps your private memories forever.
HabitBull - HabitBull
Diaro - Multiplatform online diary and mobile app designed to record your activities, experiences, thoughts and ideas. Join now for free and keep your secret diary or diet, travel or life journal securely.
Todoist - Todoist is a to-do list that helps you get organized, at work and in life.