zilvestro / grammai

grammai 
 AI writing assistance. Free & open source. 
 Offline English, German and Romanian grammar checks, with rewrites and translation through your own Claude Code or Codex account. 
 Sponsored by Affonso 
 Get started · Connect your AI · Contribute · GPL 3.0 
grammai is an open-source writing assistant for Chrome and Chromium browsers such as Helium. It checks what you write, highlights issues in place, and lets you apply corrections without leaving the editor.
**The extension is free.** English, German and Romanian spelling and grammar work on your device, without an account or extra software. Optional AI features use your own signed-in Claude Code or Codex CLI. Your provider's access requirements and usage limits apply; grammai does not include an AI subscription.
## A little help, right where you write
- **Spelling and grammar, offline.** English, German and Romanian engines and dictionaries are bundled with the extension.
- **Context matters.** Local grammar rules and targeted word-confusion checks cover constructions such as “Ist das wirklich war?” → “Ist das wirklich wahr?” An optional AI context check handles a broader passage.
- **Corrections in place.** Hover to highlight a marked word, click to review, then accept or dismiss. Undo restores the last grammai edit.
- **Rewrites in your voice.** Improve clarity, shorten a passage, change the tone, or save your own named prompts.
- **Translate and keep writing.** Translate between English and German or Romanian and replace the selection, or the active field, in one action.
- **Quiet by default.** The action pill appears only when you select text. Light and dark modes, keyboard shortcuts and per-site controls are included.
## See it in action
| Automatic German checking | Rewrites with your own AI |
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| English ↔ German translation | Your prompts, in dark mode |
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Screenshots use sample drafts in a separate browser profile. The rewrite shown was generated through the installed AI CLI. They contain no personal browsing session or account data.
## Installation
**Chrome Web Store — coming soon.** The button above is a placeholder until the first listing is available. Store users will install the extension once; ordinary grammar checks need no additional setup.
To try the current source build:
 [code] 
Use **Node.js 22 or newer** to build the project. Open `chrome://extensions`, enable **Developer mode**, choose **Load unpacked**, and select the generated `dist` directory. Helium uses the same extension management screen.
Open a supported text field and start writing. English, German and Romanian are detected automat