RewriteBar is a lightweight macOS menu bar application that brings AI-powered writing improvements to any app on your Mac. Highlight text in Slack, email, code editors, or browsers, and instantly fix grammar, rephrase content, adjust tone, or translate without switching windows. It connects directly to AI providers like OpenAI and Anthropic, keeping your text private with no server storage.

• System-Wide Integration: Works in any macOS application including Slack, Gmail, code editors, Figma, and browsers without switching contexts.
• Multiple AI Models: Choose from many AI providers like OpenAI, Anthropic, Groq, Mistral and more, select preferred models for different tasks, and even use local models via tools like Ollama or LM Studio.
• Grammar and Style Fixes: Highlight text to correct grammar errors, rephrase for clarity, simplify complex sentences, or expand brief notes into full paragraphs.
• Tone Adjustment: Transform writing to match formal, casual, or editorial styles while preserving original meaning.
• Humanize AI Text: RewriteBar can adjust tone and phrasing so text sounds more natural and conversational, making rough or AI‑generated text feel clearer and easier to read.
• Multi-Language Support: Write confidently in German, English, Spanish, and other languages with translation capabilities.
• Custom Keyboard Shortcuts: Set up hotkeys for instant access to frequently used features without menu navigation.
• Privacy-First Architecture: Direct communication with AI providers means your text and API keys never touch external servers, weighing just 25 MB.

• Works Everywhere on Mac: Integrates into any macOS application without needing plugins or extensions for each app.
• Fast and Lightweight: Processes text instantly with no loading spinners, and uses minimal system resources at 25 MB.
• Natural-Sounding Results: Produces text that maintains your intended tone and doesn't sound robotic or over-edited.
• Flexible Pricing: Offers both subscription ($5/month) and one-time purchase ($29) options instead of subscription-only models.
• Privacy Focused: Your text goes directly to AI providers with no data stored on third-party servers.

• macOS Only: No Windows or Linux version exists, and none is planned for the future.
• API Setup Required: The one-time license requires manual OpenAI API key configuration, which may confuse beginners.
• Limited Documentation: Homepage lacks usage examples for new users to understand full capabilities before purchasing.
• Cloud AI Costs: One-time license users pay separately for OpenAI API usage, which can add up with heavy use.

• Email Communication: Clean up drafts in Mail or Gmail by fixing grammar mistakes and adjusting tone from casual to professional before sending. Select rough text, apply the formal tone preset, and send polished messages without leaving your email client.
• Slack and Team Chat: Improve quick messages to colleagues by correcting errors and clarifying meaning in real-time. Non-native English speakers can write confidently knowing grammar and phrasing will be fixed before hitting send.
• Meeting Documentation: Transform messy voice transcripts into clean, readable notes by removing filler words and formatting content properly. Copy recorded meeting text, apply the "Format Transcribed Text" command, and get organized bullet points ready to share.
• Code Documentation: Write clearer code comments and README files by simplifying technical explanations for broader audiences. Highlight complex technical descriptions in your code editor and simplify them without switching to another app.
• Content Translation: Translate sentences between German, English, Spanish, and other languages directly in your browser or document without opening Google Translate. Perfect for international teams collaborating across language barriers.
• Social Media Posts: Expand brief ideas into full posts or condense long thoughts into concise messages that fit character limits. Draft in any app, adjust length and tone, and post immediately.