Last updated: 2026-05-21
macOS menu bar app that rewrites selected text in any app using a keyboard shortcut, with Claude, OpenAI, and Mistral support. Free plan, Pro at $10/month.
RewriteCmd is an AI ai writing assistant by Hyperstack Studio that macos menu bar app that rewrites selected text in any app using a keyboard short.
RewriteCmd is a macOS-native AI writing assistant built by Hyperstack Studio that rewrites text directly inside whatever application is currently open. Rather than switching to a separate writing tool or browser tab, users select text in any macOS application, press a customizable keyboard shortcut, and the selected text is rewritten in place. The workflow interruption is near-zero. The application sits in the macOS menu bar with no dock icon, keeping it accessible without cluttering the desktop. It uses the user's own API keys from Anthropic (Claude), OpenAI, or Mistral, meaning all rewrites go directly to the chosen provider without passing through a third-party server beyond the AI provider itself. API keys are stored in the macOS Keychain rather than written to disk, providing native macOS-level security for credentials. Users create custom instructions that define specific rewrite styles: make it more formal, shorten it, convert to bullet points, improve clarity, adopt a specific voice. The free plan includes one custom instruction, Pro includes five, and the Business plan provides unlimited instructions with team features. All plans support unlimited rewrites using the user's own API key, so the subscription cost covers the app features while AI compute costs are billed directly from the user's provider account. RewriteCmd works on macOS 13 Ventura and later, supporting both Apple Silicon and Intel processors. It targets Mac users who write across multiple applications daily: email in Apple Mail or Gmail in Safari, messages in Slack or Teams, code comments in VS Code, and documents in Pages or Notion, all without leaving each app to run AI-assisted rewrites. The model is relatively unique in the writing assistant space: a system-level native integration rather than a browser extension or standalone web app, making it faster and more universal across macOS applications.
Free plan: basic rewriting, 1 custom instruction. Pro: $10/month (5 custom instructions, priority support). Business: $20/month (unlimited instructions, team features). All plans: unlimited rewrites using your own API key.