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Harper

Open-source · self-hostable · replaces 1 SaaS tool on os-alt

Automattic/harper · alive · ★ 10.5k · last commit 1d ago · 506 open issues

License: Apache-2.0

Good fit for Devs who want grammar/style checking that runs fully on-device with low latency and zero data leaving the box.

Weak at Younger project — fewer rules than LanguageTool; English-only at the moment.

In a terminal? npx -y github:SolvoHQ/os-alt-cli grammarly prints the Grammarly comparison table including Harper. how the CLI works →

Replaces these SaaS

  • Grammarly · Writing assistant / grammar + style checker

    Install the Harper VSCode / Obsidian / Zed plugin or the browser extension. There is no migration data in Grammarly to bring over — switch the extension and point your IDE at the Harper LSP. For self-hosted as a server, run `harper-ls --stdio` behind any LSP-aware proxy or run the WASM bundle in your own page.

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