FixKey is a Mac utility that intercepts your keystrokes and sends selected text to an AI model, rewriting, polishing, or transforming it in place — without ever leaving the app you're already in.
What is fixkey?
FixKey is a system-wide AI writing assistant that lives in your menu bar and activates on a global keyboard shortcut. Select any text in any app — a Notion doc, a Slack message, an email draft in Apple Mail — press your hotkey, and FixKey rewrites it according to the command you give: fix grammar, change tone, make it shorter, translate it, or run a custom instruction. The result lands back in the text field instantly, replacing your selection.
The concept sounds simple, but the execution matters enormously. I've been using it daily for several weeks across everything from technical documentation to client emails, and the thing that keeps drawing me back is the absence of friction. There is no context-switching to a chat interface, no copy-paste shuffle, no browser tab. You stay in the flow of whatever you're doing.
What does FixKey do best?
FixKey excels at the quick, unglamorous writing fixes that accumulate across a workday — tightening a verbose sentence, softening an accidentally blunt reply, or snapping a bulleted list into parallel structure. These tasks aren't glamorous enough to open ChatGPT for, but they're exactly the kind of micro-friction that kills writing momentum.
The in-place replacement model is what separates it from tools like Raycast AI (which opens a separate result pane) or macOS's own Writing Tools (limited to certain text fields). FixKey works almost everywhere — text editors, terminals with GUI input, web forms, Obsidian, VS Code comments. I've had it fix a commit message mid-keystroke, which felt genuinely magical the first time.
- Global hotkey activation — one shortcut from any app
- In-place text replacement — no separate result window to manage
- Custom slash commands — build your own reusable prompts for recurring tasks
- Tone and style controls — formal, casual, concise, expansive on demand
- Multi-language support — translate or rewrite in a target language inline
How much does FixKey cost?
FixKey offers a free tier that covers a limited number of AI invocations per month — enough to evaluate the workflow seriously, not enough for heavy daily use. A paid plan unlocks unlimited rewrites and access to more capable underlying models. Pricing is subscription-based; check the official site for current tiers, as they've evolved since launch.
If you're comparing value against Grammarly Premium or the AI tier of tools like Notion AI, FixKey's system-wide reach is a meaningful advantage: you're not paying per-app but getting AI editing everywhere on your Mac at once.
Who should use FixKey?
FixKey is purpose-built for anyone who writes in many different apps throughout the day and doesn't want a single dedicated writing environment. Founders drafting cold outreach in one window and Slack updates in another, developers writing issue comments and documentation, content editors who bounce between a CMS and a notes app — these are the power users who feel the copy-paste tax most acutely.
It is less compelling if your writing all happens in one app that already has strong AI integration. If you live in Notion, Notion AI is already there. If you write exclusively in VS Code, GitHub Copilot covers prose comments adequately. FixKey's value multiplies with the diversity of your writing surface.
What are the best FixKey alternatives?
The closest system-wide competitor on Mac is Raycast AI, which also activates globally and can rewrite selected text — but it opens results in the Raycast window rather than injecting back in place, which adds a step. PopClip with an AI extension comes close to the in-place model but requires mouse-driven selection rather than a keyboard-first flow. Apple's own Writing Tools (macOS Sequoia+) handle basic grammar and rewriting natively in supported apps, but coverage is inconsistent across third-party software and customisation is minimal.
For users who want a chat-style companion alongside their editor, Claude.ai or ChatGPT in a persistent window is still unbeatable for longer, iterative drafts. FixKey fills the space below that threshold — the sub-paragraph edits that aren't worth a full conversation.
How does FixKey compare to macOS Writing Tools?
Apple's Writing Tools are free and deeply integrated, but they require macOS Sequoia and only activate reliably in first-party and select third-party apps. FixKey works on older macOS versions, reaches across virtually every text field on the system, and — critically — supports fully custom prompts rather than a fixed menu of proofreading options. For a power user with a nuanced editing style, that flexibility is the whole point.
