TATEditor is an application that allows you to create and edit text in vertical writing.
You can write novels, scripts, scenarios, etc. ​​in vertical writing mode on Android.
Using your Google / Apple / Microsoft account, you can synchronize texts and memos between iOS app, Android app, and website of TATEditor.
It also supports dark mode, and you can choose your favorite colors in the editor.
It also has a PDF output function, and you can create manuscript data only with this app.

Main functions:
- Automatic backup of text being edited
- Incremental search and replacement of strings
- Regular expressions
- Copy / Cut / Paste
- Real-time character counter
- Dark mode on / off
- Font switching
- Change background color / text color
- Vertical PDF output
- Supports ruby in Aozora Bunko format, etc.
- Supports emphasis marks, side points, tate-chu-yoko
- Notes associated with projects and texts
- Management of stories and chapters of series works
- Character code can be automatically detected from texts other than Unicode.

Website: https://tateditor.app/
Author account: https://twitter.com/496_
Development blog: https://www.pixiv.net/fanbox/creator/13749983