Reimplementation · Productivity

Harper

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Summary

Check English spelling and grammar locally in your browser and editor, without sending text to a server.

Description

Harper provides Grammarly-style spelling and grammar suggestions with processing entirely on the user's device. Its Rust engine supports English proofreading through browser and editor integrations, a language server, JavaScript and Rust libraries, and a native macOS application.

Source repository ↗Website ↗Try it in your browser ↗Documentation ↗

Community

Discord server ↗

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Compatibility and scope

Status and compatibility are maintainer-reported. Inclusion is not an independent verification or certification.

Development status: Stable
Compatibility: Partial (claimed)
Languages: Rust, TypeScript
Platforms: Not documented
License: Apache-2.0

Known limitations

Supports English and its dialects only. Its scope is narrower than Grammarly's broader writing assistant; full feature parity and interface compatibility are not claimed. Available features vary by integration.