ProofKey
CuratedGrammarly-style grammar checks and rewrites in Chrome, sent only to your own LLM API key or a local model. No backend, no telemetry.
Curated listing — added by OSSDrop, not the maker.
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[](https://ossdrop.com/tool/proofkey)Frequently asked
What is ProofKey?
ProofKey is an open-source productivity tool — Grammarly-style grammar checks and rewrites in Chrome, sent only to your own LLM API key or a local model. No backend, no telemetry. It is written in TypeScript.
Is ProofKey free and open source?
Yes. ProofKey is free and open source, released under the MIT license. You can view and contribute to the source at https://github.com/jiru-labs/proofkey.
What language is ProofKey written in?
ProofKey is primarily written in TypeScript.
What are open-source alternatives to ProofKey?
Other open-source productivity tools on OSSDrop include PowerToys, Excalidraw, AppFlowy, Cal.com.
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