prosed
GitHub

sed for your prose.

A grammar checker that runs on your machine.

Download for macOSSource on GitHub

Apple siliconMIT license

Other downloads:WindowsBrowser extension

Animated example: prosed underlines two mistakes in a message, fixes them, then rewrites a long sentence.

Runs on

What it does

Fixes one word at a time

Mistakes are underlined inside the field you type in. Hover one, click the fix, and that word changes. Nothing else does, and Cmd+Z or Ctrl+Z undoes it.

Rewrites when you ask

Select a sentence to get three versions of it. A version that drops a number, a name or a link is never shown.

Remembers what you refused

Words in your dictionary are never changed. A fix you ignore once is never proposed again, on any site.

On your machine

Where it runs

  • Browser extension

    For Chromium browsers such as Chrome and Arc. Works in text areas and rich editors.

    • Chrome
    • Arc
    • Brave
    • Edge
    • Vivaldi
    • Opera

  • Desktop app

    Checks the text you type in any app on macOS and Windows.

    • macOS
    • Windows

  • Firefox and Safari: use the desktop app.

    • Firefox
    • Safari

Which model

Checks run on a local model by default: Ollama, or Gemini Nano built into Chrome. With either one, your text stays on your computer.

  • Ollama
  • Gemini Nano

You can also add your own API key for OpenAI, Anthropic, Mistral or another provider. Checks then go straight from your computer to that provider.

  • OpenAI
  • Anthropic
  • Gemini API
  • Mistral
  • OpenRouter
  • Groq
  • DeepSeek

Privacy policy

Measured

Graded on the default local model, on an M2 Pro. How it’s measured

short sentences fixed
14/14
fast-typed messages fixed
10/10
rewrite variants kept
30/30
median time per check
0.4–0.6 s

Keep typing. prosed reads along.

Download for macOS