| Price from | $12/mo | — |
| Free plan | — | — |
| Free trial | Yes | — |
| Open source | — | — |
| Web | Yes | — |
| Windows | — | Yes |
| macOS | — | Yes |
| Linux | — | Yes |
| API | Yes | — |
| Plans published | 3 | 0 |
| Spec score · Writing Style Checkers | 8.5 (#6) | 7.0 (#27) |
| Integrations | Official pages list Dropbox and Slack applications as integrations. | The project lists integrations or packages for Atom, Emacs, Vim, WordPress, IntelliJ IDEA, Sublime Text, and Visual Studio Code. |
| Purpose | Readable is an online toolkit for analyzing and improving writing readability and quality. | RedPen is a proofreading tool for writers and programmers who write technical documents or manuals that must follow a writing standard. |
| Support | Readable advertises an extensive knowledge base plus in-app and email support. | The project lists documentation, a mailing list, and English and Japanese chat rooms for support. |
