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// overview
What is Harper?
Harper is listed under Writing on ListMySaaS. A free, private, open-source grammar checker that runs on your device
Harper is a free, open-source grammar and spell checker that runs entirely on your device, so your writing never leaves your computer. It is built for writers and developers who want a private alternative to Grammarly.
Key features
- Fully local: Every check runs on your device, with no cloud requests, telemetry or AI model in the loop.
- Fast: Suggestions appear in under 10 ms as you type.
- Works everywhere: Browser extensions for Chrome, Edge and Firefox, a macOS desktop app, and plugins for VS Code, Obsidian, Neovim, Zed and WordPress.
- Developer friendly: Available as a language server, a JavaScript library and a Rust crate.
- English variants: Covers US, UK, Canadian, Australian and Indian English.
// audience
Who is Harper for?
Good fit if
- You want a fully local grammar checker that never sends text to the cloud
- You write in code editors like VS Code, Neovim, or Zed and want native plugins
- You need grammar and spell checking across multiple regional English variants
Good to know
- The software is free and open-source without cloud requests or telemetry
- Integrations include browser extensions, a macOS desktop app, and editor plugins
- Developers can use it as a language server, JavaScript library, or Rust crate
// pricing
How is Harper priced?
Harper is listed as free. Confirm that on the vendor site before you rely on it, because plans change.
// alternatives
How does Harper compare to alternatives?
Harper is listed as Free. In Writing, the closest listings are Outwrite, Grubby AI, and Grammarly. Outwrite is listed in the same category. Grubby AI is listed as Freemium · from $6.99/month. Grammarly is listed as Freemium · from $12/month. See the alternatives page for the rest of the Writing list.
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// reviews
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