Harper
Harper is ranked #15 of 86 in grammar checkers on The Geeks Club. It runs on Web, Windows, macOS, Linux. There is a free plan.
Harper plans and pricing
All plansFree Free Grammar and spelling checking · Local processing · Apache-2.0 open-source license writewithharper.com · 20 Sept 2026
Compared on grammar checkers
- Free plan
- Yes
- Browser extension
- Yes
- Desktop app
- Yes
