Comparison · AI writing assistants
LanguageTool vs ProWritingAid: which is better in 2026?
LanguageTool ranks higher in our list of AI writing assistants (#2 against #4, score 87.5 against 82.0).
Choose LanguageTool if you want
Multilingual proofreading with an open-source core.
Checks grammar and style across dozens of languages, with add-ons for browsers, Gmail, Outlook and Office. Its core is open source under LGPL 2.1, but paraphrasing is limited without Premium.
Choose ProWritingAid if you want
Book-length editing with story planning.
A story canvas, plot analysis and detailed style reports, with a free plan. Premium at $30 a month is aimed at committed book writers, and the tool is less suited to short copy.
The main differences
- Only LanguageTool runs on Windows.
- Only LanguageTool runs on macOS.
- LanguageTool is open source; ProWritingAid is not.
Side by side
 LanguageTool |  ProWritingAid | |
|---|---|---|
| Score | 87.5 | 82.0 |
| Rank in list | #2 of 6 | #4 of 6 |
| Price | Free plan, paid upgradesFree grammar checking; Premium adds unlimited paraphrasing and more features | Free plan, paid upgradesFree plan; Premium $30 a month billed monthly; Premium Pro $36 a month billed monthly |
| Free to use | Yes | Yes |
| Open source | Yes | No |
| Platforms | WebWindowsmacOSBrowser extensionWeb, Windows, macOS, Browser extension | WebWeb |
| Made by | Not stated | Not stated |
| Main focus | Grammar and style checking | Long-form editing |
| AI writing features | AI-based checks and paraphrasing | Not listed |
| Story and plot tools | Not listed | Story canvas and plot analysis |
| Team plans | LT for Business | Not listed |
| Best for | Multilingual proofreading with an open-source core | Book-length editing with story planning |
| Strengths |
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| Limits |
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| Links | Visit site | Visit site |
Questions about LanguageTool vs ProWritingAid
- Is LanguageTool better than ProWritingAid?
- LanguageTool ranks higher in our list of AI writing assistants (#2 against #4, score 87.5 against 82.0). LanguageTool is best for: multilingual proofreading with an open-source core. ProWritingAid is best for: book-length editing with story planning.
- Which is cheaper, LanguageTool or ProWritingAid?
- LanguageTool: Free grammar checking; Premium adds unlimited paraphrasing and more features. ProWritingAid: Free plan; Premium $30 a month billed monthly; Premium Pro $36 a month billed monthly.
- Do LanguageTool and ProWritingAid run on the same platforms?
- LanguageTool supports Web, Windows, macOS, Browser extension. ProWritingAid supports Web.