Last updated 07-01-2026
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Steer
Steer is a native desktop writing assistant for macOS and Windows that fixes spelling, tightens wording, and polishes tone without leaving the app you are already in. Select text in Slack, Teams, Apple Mail, Word, or Chrome, run a shortcut, and get rewritten copy in about two seconds.
Instead of opening a separate editor, Steer runs as a system-level helper that reads app context to adjust tone for professional channels. Its advanced improve mode analyzes the goal of each message, shows the detected tone while it rewrites, and highlights changes in green so you can spot edits quickly.
Selected text is sent through an open-source backend to OpenAI's API for rewriting, and Steer only processes text you explicitly choose to improve. The app fits managers, marketers, and non-native English speakers who spend their day rewriting emails and chat messages.
Rewrites selected text in about two seconds without switching apps
Press ??????F to proofread or ??????G to improve writing on macOS
Adjusts tone automatically based on which app you are writing in
Advanced improve shows the detected goal and tone while it rewrites
Follows your English locale for US, British, or Australian spelling
Works inside Slack, Teams, Mail, Word, and Chrome without opening a separate editor.
Free Starter tier includes 10 fast requests per day before you upgrade.
Open-source backend on GitHub documents how selected text is processed.
Desktop-only with no browser extension or mobile app listed on the site.
Free tier limits you to 10 fast requests per day.
Non-English languages are supported through GPT-4 but English delivers the best results.
Does Steer have a free plan?
Yes. Steer's Starter plan is free and includes 10 fast requests per day, grammar and wording improvements, app-based tone adjustment, and support across any application. You can download it without paying upfront.
What platforms does Steer support?
Steer runs on macOS 12 and above and on Windows 10 and Windows 11. The latest macOS release listed on the downloads page is version 3.4.1, and the Windows installer is version 0.9.6.
Is my writing data private with Steer?
Steer only processes text you explicitly select for rewriting. That text is sent to OpenAI's API through Steer's open-source backend on GitHub, and Steer states it does not store rewritten text after the result is returned.
What languages does Steer support?
Steer uses GPT-4, which handles multiple languages out of the box. The site notes that English delivers the best results and that quality in other languages may vary.
How much does Steer Pro cost?
Steer Pro is listed at $3.60 per month when billed yearly, with unlimited fast requests and everything in Starter. A Lifetime plan is also available for a one-time $149 payment with lifetime updates.
Does Steer need accessibility permissions on macOS?
Yes. Steer needs macOS accessibility permission to work across applications. The site links to a Notion help guide that walks through granting that permission during setup.