Last updated: 2026-07-01
RewriteCmd is a macOS menu bar app that rewrites selected text in any app via shortcut, powered by Claude, OpenAI, or Mistral. Free plan, Pro at $10/month.
RewriteCmd is a macOS menu bar app by Hyperstack Studio that rewrites selected text in any application using a keyboard shortcut. It connects to Claude, OpenAI, or Mistral with your own API key, stores credentials in the macOS Keychain, and runs on macOS 13 Ventura and later. The Free plan includes 1 custom instruction, Pro is $10/month with 5 instructions, and Business is $20/month with unlimited team instructions.
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.
RewriteCmd is a macOS-native AI writing assistant built by Hyperstack Studio that lives in the menu bar with no dock icon. It lets a user select text in any application, email, Slack, Notion, an IDE, press a customizable keyboard shortcut, and have the selected text rewritten in place within about a second. There is no copy-pasting and no switching to a separate browser tab or app. The application is written in native Swift with no external dependencies, which keeps it lightweight on macOS. It connects to one of three AI providers using the user's own API key: Anthropic (Claude), OpenAI, or Mistral. RewriteCmd requires macOS 13 Ventura or later and runs on both Apple Silicon and Intel Macs, making it usable across most Macs sold since 2022.
RewriteCmd has three tiers. The Free plan includes basic rewriting with 1 custom instruction. The Pro plan costs $10 per month and includes 5 custom instructions plus priority support. The Business plan costs $20 per month and includes unlimited custom instructions along with team features for shared use across an organization. Every tier, including Free, supports unlimited rewrites because the app uses the user's own API key from Anthropic, OpenAI, or Mistral rather than billing AI usage itself. That means the monthly subscription only covers the app's features and instruction limits, while the cost of the underlying AI model calls (Claude, GPT, or Mistral) is billed separately and directly by whichever provider the user connects.
RewriteCmd's main differentiator is that it is a system-level native macOS integration written in Swift rather than a browser extension or standalone web app, so it works inside any application on the Mac, not just a browser tab. Most AI rewriting tools either require pasting text into a separate window or only function inside specific apps like Google Docs. RewriteCmd instead rewrites text in place, in under a second, inside whatever app currently has focus, whether that is Apple Mail, Slack, VS Code, or Pages. It also supports three separate AI providers (Claude, OpenAI, Mistral) under a single bring-your-own-key model, and stores API keys in the macOS Keychain rather than on disk, giving credential handling the same protection macOS gives passwords and other secrets.
RewriteCmd and RewriteBar are both macOS menu bar apps that rewrite selected text in any application via a keyboard shortcut, and both target the same workflow: select text, hit a hotkey, get a rewrite in place. The main practical difference is the billing model. RewriteCmd uses a bring-your-own-API-key approach across Claude, OpenAI, and Mistral, with the app subscription priced separately from AI usage, currently Free, $10/month Pro, or $20/month Business. RewriteBar is positioned more broadly as a macOS AI writing assistant covering grammar, translation, and general productivity tasks. For a Mac user who already pays for an Anthropic or OpenAI API key and wants a lightweight, native rewrite-in-place tool with custom instructions, RewriteCmd's model can work out cheaper since the subscription itself stays flat regardless of how much text is rewritten.
Yes, RewriteCmd has a Free plan that includes basic text rewriting and 1 custom instruction, with unlimited rewrites since the AI calls run through the user's own API key rather than a metered allowance from RewriteCmd itself. The Free plan does not include the additional custom instructions or team features available on paid tiers. To get 5 custom instructions and priority support, the Pro plan costs $10 per month, and for unlimited custom instructions plus team features, the Business plan costs $20 per month. Because every plan, including Free, requires the user to supply their own API key from Anthropic, OpenAI, or Mistral, the real ongoing cost for a Free-tier user is whatever that provider charges for the tokens used during rewrites, which is typically a small fraction of a cent per rewrite for short text selections.
RewriteCmd is best for Mac users who write across many different applications during the day, email in Apple Mail or Gmail through Safari, messages in Slack or Microsoft Teams, code comments in VS Code, and documents in Pages or Notion, and want one consistent AI rewrite shortcut everywhere instead of switching tools. It particularly suits users who already have an API key for Claude, OpenAI, or Mistral and are comfortable managing their own AI usage costs. It is less suited to users who want an all-in-one subscription with AI usage bundled into the price, since RewriteCmd's tiers cover the app only, not model usage. It is also Mac-only, requiring macOS 13 Ventura or later, so Windows and Linux users cannot run it at all.
No, RewriteCmd requires an internet connection because every rewrite is processed by sending the selected text to whichever AI provider the user has configured, Anthropic's Claude, OpenAI, or Mistral, over that provider's API. The app itself is a lightweight native Swift menu bar utility with no bundled offline model, so without connectivity to the chosen provider's API endpoint, the keyboard shortcut will not return a rewritten result. This is consistent with how most AI writing assistants work in 2026, since running a capable rewriting model locally on a Mac would require significantly more storage and compute than a small menu bar app is designed to use. Users on unreliable connections should expect rewrite requests to fail or time out until connectivity is restored.
RewriteCmd is designed so that rewrite requests go directly from the user's Mac to the chosen AI provider, Claude, OpenAI, or Mistral, using the user's own API key, without passing through a third-party server beyond that provider itself. API keys are stored in the macOS Keychain, which encrypts credentials at the system level and never writes them to disk in plain text. Whether the rewritten text itself is used for model training depends on the data-handling policy of whichever provider is selected, Anthropic, OpenAI, or Mistral, each of which publishes its own API data-usage terms separate from RewriteCmd. Users with strict confidentiality requirements should check their chosen provider's API terms, since RewriteCmd's role is limited to capturing the selected text, sending it to that provider's API, and pasting back the result.
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.
Hyperstack Studio · Free tier available