Harper
8.5#5 in grammar checkersFree planFree planAndroidiOSWebAPI
VisitHarper vs Writefull
What both publish
| Fact | Harper | Writefull |
|---|---|---|
| Browser extension | Yes | Yes |
| Free plan | Yes | Yes |
| Purpose | Harper is a free, open-source grammar checker that flags capitalization, spelling, awkward phrasing, and grammar errors. | Writefull provides AI language feedback, writing widgets, and data insights for research writing. |
Harper plans
- FreeFree
- HarperFree
Writefull plans
- FreeFree
- Premium$150 a year
- Group$285 a year
- InstitutionPriced on request
Pick Harper if…
Harper suits writers seeking grammar and spelling checks with style suggestions, especially those who want web, browser-extension, or desktop access. Its single supported language makes it a fit for users who need that language coverage.
Pick Writefull if…
You want what its maker publishes above — check its page for the details.