What kind of notebook software is the safest for mobile phones?

Secure and easy-to-use note-taking software on mobile phones can use dedicated cloud notes:

Both Apple phones and Android phones can use desktop note-taking software, and dual-system phones can automatically synchronize notes.

To use the dedication sign, you need to register a member account to log in, and the edited notes are automatically stored in the cloud database to avoid the problem that local data is easily lost.

There is a log timeline list on cloud notes, which keeps the backup records of accounts for a long time, including modified and deleted notes, and the wrongly deleted notes can be retrieved at any time through the timeline.