Workflow comparison

Keystro vs Grammarly: two different ways to improve writing.

Grammarly is built around continuous suggestions and writing feedback. Keystro is built around deliberate keyboard actions on selected text. This page explains the practical differences so you can choose the workflow that fits.

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Keystro

Deliberate keyboard actions

compared with
Grammarly

Continuous writing assistance

Start with the workflow

The main difference is when the assistant appears.

Keystro: explicit action

  1. 1Select the exact text you want to process.
  2. 2Press Correct, Draft Email, or Ask.
  3. 3Review the result in the same app.

Best when you want the AI to remain invisible until you deliberately call it.

Grammarly: ongoing assistance

  1. 1Start typing while Grammarly is active.
  2. 2Review underlines, widget suggestions, or the AI side tab.
  3. 3Accept, dismiss, or request a generative rewrite.

Best when you want automatic proofreading and suggestions while you write.

Side-by-side

Keystro and Grammarly compared.

Product descriptions are based on publicly documented capabilities. Features can change, so official Grammarly sources are linked below.

Primary workflow+

Keystro

Select text → press a shortcut → use the result

Grammarly

Write with a floating widget, underlines, suggestions, or an AI side tab

Best suited to+

Keystro

Repeated, deliberate text actions without leaving the active app

Grammarly

Continuous proofreading, writing feedback, and broader writing assistance

Custom AI requests+

Keystro

Inline // instructions and Ask on selected text

Grammarly

Suggested prompts, Revise with AI, and AI Chat

Activation model+

Keystro

Runs only after an explicit keyboard shortcut

Grammarly

Provides suggestions while the Grammarly product is active; it can be disabled per app

Personal context+

Keystro

Professional profile, vocabulary, and reusable prompt presets

Grammarly

Style, tone, brand, and feature customization depending on plan

Availability+

Keystro

Windows 10/11, across desktop apps and browser text fields

Grammarly

Windows, macOS, browser extensions, and mobile offerings

Choose Keystro when

You want AI on command, not always in view.

  • You prefer keyboard shortcuts over a floating widget or side tab.
  • You repeatedly draft, summarize, translate, or transform selected text.
  • You want professional profile, vocabulary, and prompt presets in one workflow.
  • You want text processing to begin only after an explicit trigger.

Choose Grammarly when

You want continuous proofreading and broad platform coverage.

  • You want automatic spelling, grammar, and tone suggestions while typing.
  • You prefer reviewing suggestions through a widget or side panel.
  • You need official macOS, browser, or mobile offerings today.
  • You rely on Grammarly-specific writing feedback and organization features.

Privacy models

Different interaction models, not a simplistic privacy ranking.

Grammarly publishes privacy controls, security certifications, and data-use explanations. Keystro uses a narrower trigger model: only selected text is processed after a shortcut, and text content is never stored by Keystro.

Keystro trigger

Only the text deliberately selected when a shortcut is pressed.

Keystro retention

No text in databases, logs, or persistent caches; store: false on every OpenAI call.

Grammarly model

Suggestions are provided while Grammarly is active, with documented controls and per-app disabling.

Questions

Keystro vs Grammarly FAQ

Is Keystro a direct replacement for Grammarly?+

Not necessarily. Grammarly is strong for continuous proofreading and suggestions. Keystro is designed for deliberate keyboard-triggered actions such as correcting, drafting, summarizing, translating, and following custom instructions. Some users may prefer one workflow; others may use both.

Do both products work across Windows apps?+

Yes, both offer broad Windows coverage. Grammarly uses a floating widget, underlines, and a side tab in supported contexts. Keystro acts on selected text after a global keyboard shortcut and can fall back to a compact result window when direct replacement is unavailable.

Which one is better for continuous grammar feedback?+

Grammarly is the clearer fit if you want automatic underlines and suggestions while typing. Keystro deliberately avoids continuous monitoring and runs only when you trigger it.

Which one is better for custom transformations?+

Both support generative AI. Keystro emphasizes reusable keyboard actions, inline // instructions, and selected-text prompts. Grammarly offers suggested prompts, Revise with AI, and AI Chat through its interface.

Does Keystro claim to be more private than Grammarly?+

No broad superiority claim is made. The products use different interaction and data models. Keystro processes only deliberately selected text, does not store text content, and sends every OpenAI request with store: false. Grammarly publishes its own privacy controls, certifications, and data-use explanations.

Can I try Keystro for free?+

Yes. Keystro Free includes 50 AI actions per month, all three shortcuts, inline // instructions, profile-aware personalization, and reusable prompt presets. No payment card is required.

Grammarly sources checked August 17, 2026

Grammarly is a trademark of its respective owner. Keystro is not affiliated with or endorsed by Grammarly or Superhuman.

Prefer a keyboard-first workflow?

Try Keystro with 50 AI actions per month, all three shortcuts, and no payment card.

Download free for Windows