あれから何日 is a useful Android app developed by kk01. It allows you to record dates and automatically calculates the duration from the recorded date to the present or a set final date. You can also attach images to your records for better organization. The data is saved in text files, allowing you to keep separate records for different categories.

The app offers four different display formats for the number of days: year, month, day; year, month; month, day; and day. You can easily switch between these formats in the settings menu. Additionally, you can count up or count down depending on your needs.

One unique feature of あれから何日 is the ability to add a title (or label) below the icon. This allows you to give each icon a personalized meaning for your own convenience.

Please note that the app creates a folder for data storage upon initial launch. If you decide to uninstall the app, you will need to manually delete the folder (kk01app/Life_datecntmemo) if it's no longer needed.

Overall, あれから何日 is a simple yet powerful day counter app that helps you keep track of important dates and durations. It offers customization options and a user-friendly interface for a seamless experience.