SentenceNest — Grammar & Writing Assistant

Fix grammar and rewrite text where you write, using your own AI provider API key. Review, apply, and undo.

SentenceNest helps you edit a message before you send it, using your own AI provider API key. WHAT YOU CAN DO • Correct spelling, punctuation and grammar. • Improve clarity; make text formal, friendly, playful, confident or considerate. • Shorten, expand, format as bullet points, or give your own editing instruction. • Translate meaning into a chosen language or convert Romanized writing into a native script. • Review and edit a suggestion, apply it to a compatible field, copy it, or undo the last replacement. LANGUAGES AND SCRIPTS Includes English and presets for India’s 22 scheduled languages: Assamese, Bengali, Bodo, Dogri, Gujarati, Hindi, Kannada, Kashmiri, Konkani, Maithili, Malayalam, Manipuri, Marathi, Nepali, Odia, Punjabi, Sanskrit, Santali, Sindhi, Tamil, Telugu and Urdu. You can also enter another language name. Romanized Telugu and Hindi can be preserved or converted to native letters. Language and transliteration quality depends on the model; always review the result. BRING YOUR OWN KEY Supports OpenRouter (including its free-model router), OpenAI, Anthropic Claude, Google Gemini, and custom HTTPS OpenAI-compatible APIs. OpenRouter free-only mode does not silently fall back to paid models. Free model availability and usage limits can change. Other providers may charge for requests. A ChatGPT or Cursor subscription is not an API key for this tool. YOU CONTROL THE TEXT Text is sent directly to your chosen provider only when you request a revision. SentenceNest does not send the whole webpage, automatically send messages, save draft history, or use its own processing server. Keys are session-only by default; optionally remember a key locally on your computer without encryption. Provider privacy policies apply. Disable individual sites in settings. COMPATIBILITY Designed for ordinary text fields, textareas and standard contenteditable message editors. Some app-managed editors, canvas editors, protected Chrome pages and closed shadow roots are unsupported. Select a passage when editing rich drafts with formatting or signatures; copying is the fallback. Password and other sensitive fields are excluded using field metadata, which does not detect every kind of sensitive content. GET STARTED Open SentenceNest settings from the extensions toolbar, choose a provider, add its API key and model, and save. Reload your website, focus a text field and click the pen button. Generate, review, then apply. SentenceNest never presses Send for you. This is a desktop Chrome extension. A responsive layout does not make it a phone keyboard or a mobile Chrome extension. AI can make mistakes and change meaning.