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.
CPU-Z - CPU-Z is a freeware that gathers information on some of the main devices of your system : Processor name and number, codename, process, package, cache levels.
Habitica - Habitica is a free habit building and productivity application.
Speccy - Speccy - find the details of your computer's specs. Great for spotting issues or finding compatible upgrades. Download the latest version free.
HabitBull - HabitBull
AIDA64 - AIDA64 is a system information, diagnostics and benchmarking solution for Windows PC.
Todoist - Todoist is a to-do list that helps you get organized, at work and in life.