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.
NaturalReader - Main Feature: Full Common Functions: Read Text Files o Text files o MS Word files
Habitica - Habitica is a free habit building and productivity application.
TexTalky - Turn any text or script to a lifelike neural human voice, a powerful A.I text to speech realistic voiceover that covers more than 130 international languages & Accent and over 900 kinds of lifelike human voices that meets most of your needs.
Todoist - Todoist is a to-do list that helps you get organized, at work and in life.
Voicepods - Convert any text to human-like voice
HabitBull - HabitBull