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Harper

Private, open-source grammar checker

Fast open-source grammar checker that runs locally in editors, browsers and Obsidian without sending text to a server.

Visit Harper ↗

Pricing: Free

Platforms: Browser extension, Mac, Windows, Linux, Web

Categories: Writing

Harper is an alternative to

Grammarly

Harper compared with similar tools

Product	Price	Open source	Self-host	Platforms
Harper	Free	Yes	–	Browser extension, Mac, Windows, Linux, Web
LanguageTool	Free plan	Yes	–	Web, Mac, Windows, Browser extension, API
Jan	Free	Yes	–	Mac, Windows, Linux
KeePassXC	Free	Yes	–	Windows, Mac, Linux, Browser extension
Anytype	Free plan	Yes	–	Mac, Windows, Linux, iOS, Android
Tuta	Free plan	Yes	–	Web, Mac, Windows, Linux, iOS, Android
KeePassium	Free plan	Yes	–	iOS, Mac

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Questions

Is Harper free?

Harper is free.

Is Harper open source?

Yes, Harper is open source.

What platforms does Harper run on?

Harper is available for Browser extension, Mac, Windows, Linux, Web.

What are some alternatives to Harper?

Similar indie products include LanguageTool, Jan, KeePassXC, Anytype and 4 more.

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