Open-Source, Self-Host-Friendly Browser Grammar Checker, Because LanguageTool's Extension Is Going Premium-Only And Is Closed-Source
LanguageTool is locking its browser extension to Premium subscribers within weeks; the official 'just self-host it' workaround is only half a fix because the extension itself is proprietary and the Chrome build often refuses to talk to a self-hosted server. Privacy-minded writers want a trustworthy open-source, cross-browser extension that points at their own LanguageTool instance, so dictated text never leaves their machine. The server side is already open and Dockerizable; the missing piece is the client.
The server's already open, so the whole product is a trustworthy open-source extension that targets the user's instance and fixes the Chrome CORS mess. Ship that, not another grammar engine.
landscape (3 existing solutions)
The grammar engine is open and self-hostable, but the actual gap is an open-source, cross-browser extension that reliably points at your own instance instead of a closed binary you can't audit.