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.
Google Pay - Make secure payments right through your Android device.
Habitica - Habitica is a free habit building and productivity application.
PayPal - PayPal is the faster, safer way to pay online without sharing financial details, send and receive money or accept credit and debit cards as a seller
HabitBull - HabitBull
Vodafone Wallet - Vodafone Wallet is a significantly used platform developed and published by Vodafone Inc.
Todoist - Todoist is a to-do list that helps you get organized, at work and in life.