OpenGrammar Open-source, self-hostable Grammarly alternative

Show HN: OpenGrammar Open-source, self-hostable Grammarly alternative

OpenGrammar Open-source, self-hostable Grammarly alternative is active in the show hn launch space.

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OpenGrammar is a free, privacy-first browser extension that gives you Grammarly-like writing help everywhere (Gmail, Google Docs, Notion, Reddit, etc.) without sending your data anywhere. Key points: • Core engine runs 100% locally in your browser (rule-based detection of passive voice, repetition, long sentences, readability). No internet needed. • Optional AI power: just paste your own OpenAI/Groq/OpenRouter/Ollama key. You pay only pennies for what you use. Your key never leaves the browser. • Tone rewriting (Formal, Casual, Professional, etc.) with one right-click. • Writing stats dashboard (Flesch score, reading time, vocabulary diversity). • Underlines suggestions in red/yellow/blue —

Within the show hn launch space, the company focuses on its core offering rather than a broad product line.

It is recorded at the Show HN launch stage.

Website: swadhinbiswas.github.io/opengrammar