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.
Habitica - Habitica is a free habit building and productivity application.
MyWed - MyWed Wedding Planner with Checklist and Budget app comes up with features to enable you to organize and manage all the information about wedding planning right on your mobile phone.
HabitBull - HabitBull
LadyMarry Wedding Planner - LadyMarry Wedding Planner is an app by Fotavo Inc.
Todoist - Todoist is a to-do list that helps you get organized, at work and in life.
Bridebook - Bridebook – The Wedding Planning app provides features to allow users to receive a fully customizable wedding plan with the time and date of completing all the tasks before the big moment.