Best AI Grammar Checkers in 2026
Updated
Grammar checkers can support individual writing habits as well as shared team workflows. Compared on AI rewrite suggestions, custom rules, and supported languages, the entries also identify browser extensions, desktop apps, and document integrations. Outwrite, Sapling, and Trinka are among the tools to weigh against where you write and the editing controls you need. If colleagues will use the same tool, consider its team administration details; supported integrations may matter when your work spans documents. Free-plan availability and paid-from pricing provide additional context as you compare the capabilities and platforms listed.
AI Grammar Checkers, one module each. A lit port is something its maker publishes; 7 of the 25 on this page have a public API.
- 01 GrammarCheck.ai API yesOSS not on recordFREE yesDOCS 7.3$0.21/mo
- 02 Outwrite API yesOSS not on recordFREE yesDOCS 7.3$7.95/mo
- 03 Sapling API yesOSS not on recordFREE yesDOCS 7.3$5/mo
- 04 Trinka API yesOSS not on recordFREE yesDOCS 7.3Free
- 05 Harper API yesOSS not on recordFREE yesDOCS 7.2Free
- 06 Linguix API yesOSS not on recordFREE yesDOCS 7.2$5/mo
- 07 Ginger API yesOSS not on recordFREE not on recordDOCS 6.9$0.42/mo
- 08 LanguageTool API not on recordOSS not on recordFREE yesDOCS 6.0Free
- 09 ProWritingAid API not on recordOSS not on recordFREE yesDOCS 6.0$10/mo
- 10 Grammarly API not on recordOSS not on recordFREE yesDOCS 5.9$12/mo
- 11 QuillBot API not on recordOSS not on recordFREE yesDOCS 5.9Free
- 12 Wordvice AI API not on recordOSS not on recordFREE yesDOCS 5.9$0.70/mo
- 13 Writefull API not on recordOSS not on recordFREE yesDOCS 5.9Free
- 14 Grammalecte API not on recordOSS not on recordFREE yesDOCS 5.8Free
- 15 Poli API not on recordOSS not on recordFREE yesDOCS 5.8Free
- 16 Scribens API not on recordOSS not on recordFREE yesDOCS 5.8€499.17/mo
- 17 Slick Write API not on recordOSS not on recordFREE yesDOCS 5.7Free
- 18 Typlx API not on recordOSS not on recordFREE yesDOCS 5.7Free
- 19 ORFO API not on recordOSS not on recordFREE not on recordDOCS 5.6
- 20 Microsoft Editor API not on recordOSS not on recordFREE not on recordDOCS 5.5
- 21 Wordeep API not on recordOSS not on recordFREE not on recordDOCS 5.4$8.25/mo
- 22 Antidote API not on recordOSS not on recordFREE not on recordDOCS 5.2€4/mo
- 23 Correctly API not on recordOSS not on recordFREE not on recordDOCS 5.0Free
- 24 GrammarCheck.net API not on recordOSS not on recordFREE not on recordDOCS 5.0Free
- 25 SpellBoy API not on recordOSS not on recordFREE not on recordDOCS 5.0Free
Compare all 25 in a table
| # | Platform | Score | Free plan | From | Free plan | Paid from | Supported languages | Browser extension |
|---|---|---|---|---|---|---|---|---|
| 1 | GrammarCheck.ai | 7.3 | Free plan | $0.21/mo | Yes | — | — | Yes |
| 2 | Outwrite | 7.3 | Free plan | $7.95/mo | Yes | 7.95 /user/mo | — | Yes |
| 3 | Sapling | 7.3 | Free plan | $5/mo | Yes | 12 /user/mo | — | Yes |
| 4 | Trinka | 7.3 | Free plan | — | Yes | — | — | Yes |
| 5 | Harper | 7.2 | Free plan | Free | Yes | — | — | Yes |
| 6 | Linguix | 7.2 | Free plan | $5/mo | Yes | — | — | Yes |
| 7 | Ginger | 6.9 | No | $0.42/mo | Yes | — | — | Yes |
| 8 | LanguageTool | 6.0 | Free plan | Free | Yes | — | — | Yes |
| 9 | ProWritingAid | 6.0 | Free plan | $10/mo | Yes | — | — | Yes |
| 10 | Grammarly | 5.9 | Free plan | $12/mo | Yes | 12 /user/mo | — | Yes |
| 11 | QuillBot | 5.9 | Free plan | — | Yes | — | — | — |
| 12 | Wordvice AI | 5.9 | Free plan | $0.70/mo | Yes | — | — | Yes |
| 13 | Writefull | 5.9 | Free plan | — | Yes | — | — | Yes |
| 14 | Grammalecte | 5.8 | Free plan | Free | Yes | — | — | Yes |
| 15 | Poli | 5.8 | Free plan | Free | Yes | — | — | Yes |
| 16 | Scribens | 5.8 | Free plan | €499.17/mo | Yes | — | 40 languages | Yes |
| 17 | Slick Write | 5.7 | Free plan | Free | Yes | — | — | Yes |
| 18 | Typlx | 5.7 | Free plan | Free | Yes | — | — | Yes |
| 19 | ORFO | 5.6 | No | — | Yes | — | — | — |
| 20 | Microsoft Editor | 5.5 | No | — | Yes | — | — | Yes |
| 21 | Wordeep | 5.4 | No | $8.25/mo | No | — | — | Yes |
| 22 | Antidote | 5.2 | No | €4/mo | No | — | — | Yes |
| 23 | Correctly | 5.0 | Free plan | Free | — | — | 1 languages | Yes |
| 24 | GrammarCheck.net | 5.0 | Free plan | Free | Yes | — | — | Yes |
| 25 | SpellBoy | 5.0 | Free plan | Free | Yes | — | 13 languages | — |
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Numbered spots on this list can be sponsored, and a sponsored row is labelled as paid.