Select the text
Choose only the content you want Keystro to process.
Keyboard-first AI for Windows
An AI writing assistant that works inside your Windows apps.
Select text in Outlook, Word, Teams, Slack, Gmail, or your browser. Press a shortcut and get the result where you are already working—without copy-paste or tab switching.
Free planNo card requiredWindows 10 and 11
Outlook
Microsoft Word
Microsoft Teams
Slack
Gmail
Google DocsOne deliberate workflow
Select. Press. Keep working.
Keystro removes the extra workflow around AI. You stay in the document, email, chat, or browser tab where the task started.
Press a shortcut
Trigger a focused action or add your own // instruction.
Use the result
The transformed text returns to the same app so you can continue.
See the real product
From rough text to client-ready work.
The demo shows Keystro operating across real Windows workflows: selected text, keyboard shortcuts, inline results, custom instructions, and user-controlled processing.
- No separate chat to manage
- No API key or local model setup
- No continuous monitoring of your writing
Keyboard-native actions
More than grammar correction.
Use focused shortcuts for recurring work, then extend them with inline // instructions whenever the task needs more context.
Ctrl + Shift + C
Correct and polish
Fix grammar, clarity, and structure while preserving the original meaning.
Ctrl + Shift + E
Draft a professional email
Turn rough notes into a clear message that is ready to send.
Ctrl + Shift + A
Ask anything about the selection
Summarize, translate, extract, rewrite, or answer a specific question.
Add your own instruction
Add // after selected text to translate, shorten, change tone, expand, or reuse a saved prompt.
Zero setup. Professional context. Explicit control.
Built for repeated professional writing.
Ready after sign-in
No model download, provider selection, or API key configuration before the first shortcut.
Personalized to your work
Your professional profile, vocabulary, and reusable prompts help keep results consistent.
Triggered only by you
Keystro processes only the selected text when you deliberately press a shortcut.
Honest fit
What Keystro is—and what it is not.
Keystro is designed for deliberate text actions across Windows. It complements conversational AI and app-specific copilots rather than replacing every AI tool.
Built for
Fast, repeated transformations on text you deliberately select.
Not designed for
Continuous writing surveillance or autonomous access to your apps and files.
Current limits
Windows 10/11 and an internet connection are required today.
Questions
AI writing assistant for Windows FAQ
Does Keystro work in every Windows app?+
Keystro works in Windows apps and editable text fields where text can be selected, including Outlook, Word, Teams, Slack, Gmail, Google Docs, and browsers. If an app cannot accept direct replacement, Keystro shows the result in a compact window for manual copying.
Is Keystro just a grammar checker?+
No. Correction is one quick action, but Keystro can also draft emails, summarize, translate, rewrite, extract information, and follow custom // instructions.
Do I need my own API key or a local AI model?+
No. Keystro includes the AI service and works after you sign in. There is no provider, API key, or local model to configure.
Does Keystro monitor everything I type?+
No. Keystro acts only when you deliberately select text and trigger a shortcut. It does not continuously monitor your writing.
Is selected text stored?+
No. Selected text is processed in memory and is not written to Keystro databases, logs, or persistent caches. Every OpenAI request uses store: false.
Does it work offline or on macOS?+
Keystro currently requires an internet connection and supports Windows 10 and Windows 11. A macOS version is planned for a future release.
Bring AI into the work you already have open.
Select text, press a shortcut, and keep working. Start with 50 AI actions per month for free.
Download free for WindowsNo card required · Windows 10 and 11