Improve your English writing in any app.
Select text in any application — Outlook, Word, a browser, Slack, anywhere — press the hotkey, and let AI improve your English instantly. Built for non-native English speakers who want to write with confidence.
- Set your API key — Choose a provider in Settings (Ollama Cloud, OpenRouter, or custom)
- Select text in any app
- Press the hotkey —
Ctrl + Alt + R - Choose a preset and click Rewrite
- Replace the original text with the improved version — or just Copy it
BrushUp supports multiple LLM providers:
- OpenRouter — Access 100+ models (GPT-4o, Claude, Gemini, etc.) with one API key. Get a key at openrouter.ai/keys
- Ollama Cloud — Run large models (gpt-oss, Mistral Large, Gemma 4) without a GPU. Get a key at ollama.com/settings/keys
- Custom endpoint — Any OpenAI-compatible API (e.g. self-hosted Llama, vLLM, LM Studio)
Tailored for non-native English speakers:
- Fix grammar — Correct mistakes without changing your style
- Improve English — Make your writing sound like a native speaker wrote it
- Make it formal — Business-professional tone for emails and reports
- Make it casual — Friendly, conversational tone
- Simplify — Shorter words, simpler sentences
- Translate to English — Translate any language into fluent English
- Make it polite — Soften direct statements, add courteous expressions
Download the latest .msi installer from GitHub Releases.
After installing, the app runs in the background. Press the hotkey with text selected to open the popup.
- Windows 10 or later
- An API key from your chosen provider:
- Ollama Cloud
- OpenRouter (pay-as-you-go, no subscription)
- Or any OpenAI-compatible endpoint
- The app itself costs nothing — you only pay the provider for the AI calls you make
Built with Tauri 2 (Rust + TypeScript/Vite). Text capture uses Windows UI Automation with clipboard fallback. AI rewriting uses OpenAI-compatible streaming chat completions — works with OpenRouter, Ollama Cloud, or any compatible provider.
MIT