markor

Markor is a text editor app for Android phones and tablets. It focuses on note-taking and to-do list management using plain text files. Rather than a proprietary format that only one app can open, Markor stores everything as standard text files, which means any other text editor on any device or computer can read and edit the same files.

The app supports several text formatting styles. The most common is Markdown, a lightweight way of adding formatting to plain text by using symbols like asterisks and pound signs. It also supports todo.txt, a simple system for managing tasks in a plain text file, as well as Zim (a wiki-style format), AsciiDoc, Org-Mode, CSV, and a handful of data formats like JSON and YAML. You can preview formatted documents as HTML or PDF and share them from within the app.

Markor is built around three main areas: a general Notebook folder where you store all your documents, a QuickNote section for fast access to a single notes file, and a To-Do section for task management. The notebook folder can be set to any location on the device's storage, including folders that a file syncing app such as Syncthing keeps in sync with other devices.

The app works entirely offline. It has no ads and requests no unnecessary permissions. Optional encryption for text files is available using AES256, which requires setting a password in the app settings. Customization options include a dark theme, font choices, line numbers in the editor, and auto-save with undo and redo support.

Markor is free and open source. It is available through F-Droid (an app store for open-source Android apps) and through direct download from the GitHub releases page. Community translations are managed through Crowdin.