RewriteBar

What is RewriteBar?

RewriteBar is a macOS AI writing assistant that rewrites, edits, and improves text across any application using keyboard shortcuts and custom workflows. Built as a native Mac utility, it integrates directly into the system to let users fix grammar, adjust tone, translate content, and execute custom AI actions without leaving their current app.

The tool operates through PopClip integration and keyboard shortcuts, allowing users to select text in any application and trigger RewriteBar's actions instantly. Core features include grammar and spelling correction, translation into 500+ languages, and a side-by-side comparison view to see exactly what changed in rewrites. Users can chain multiple actions together in a single workflow—for example, expanding text, adding formatting, translating, and rewriting in sequence. Preset actions cover common tasks like simplifying language, humanizing AI-generated text, converting tone from formal to personal, creating user story titles, fixing JSON errors, generating TL;DR summaries, and creating ASCII art. All actions can be customized or fully custom-built to match specific writing workflows.

RewriteBar supports both cloud-based AI models and local offline models through Ollama, LM Studio, and Apple Intelligence, providing users control over privacy and processing speed. The tool includes prompt injection guards to harden custom prompts against input safety issues, and can handle specialized formatting tasks like removing smart quotes, normalizing dashes, and preserving code elements during text transformation. It works with keyboard-only navigation for power users and maintains formatting, proper nouns, and code integrity across rewrites.

The product operates on a paid licensing model with a free trial available for download. No subscription pricing is mentioned on the site. Similar tools in the macOS writing assistant space include Quill (AI-powered editor), Grammarly for Mac (grammar-focused), and Typeface (offline-