つづけるスタンプ - 写真やアイコンで楽しく習慣化アプリ - App Store

This is an app where you can enjoy recording your daily habits in a fun stamp book. Visualize things you want to continue doing, such as studying, exercising, and reading, with stamps and experience a sense of accomplishment. You can create your own original stamps using photos and icons, and manage up to 10 stamp books simultaneously. Check consecutive days on a calendar, prevent forgetfulness with reminders, and get solid support for building habits. It's a simple stamp book app that can be used by children and adults alike.

Android: https://play.google.com/store/apps/details?id=com.tanukidevelop.tsuzukeru