How to Fix Grammar with Anthropic on Mac
Leverage Anthropic's Claude models to correct grammar and refine your writing directly on your Mac. Echoo connects to the Anthropic API so you can fix errors in any app with a single keyboard shortcut.
Why This Combination Works
Anthropic's Claude models are known for careful, nuanced text processing that respects context and authorial voice. Claude is particularly strong at understanding long, complex sentences and fixing them without oversimplifying the structure. Its instruction-following precision means it won't over-edit or inject unwanted stylistic changes into your writing.
Recommended Model
Claude Sonnet 4.5 strikes the ideal balance between speed and accuracy for grammar corrections. It handles multi-clause sentences, academic writing, and technical prose with high precision while keeping response times fast. For shorter, casual text, Claude Haiku offers blazing speed at minimal cost.
Example Prompt
Fix all grammar, spelling, and punctuation errors in the following text. Keep the original voice and sentence structure intact. Do not add or remove content. Return only the corrected text.
Setup Steps
Download Echoo
Install Echoo from echoo.ai. It lives in your Mac menu bar and works system-wide across all applications.
Add your Anthropic API key
Open Echoo settings, navigate to the Providers tab, choose Anthropic, and paste your API key from console.anthropic.com.
Select the Fix Grammar command
Use Echoo's built-in Fix Grammar command and set Claude Sonnet 4.5 as your preferred model for high-quality corrections.
Highlight text and press the shortcut
Select any text in any Mac app, trigger your keyboard shortcut, and Echoo replaces it with the grammar-corrected version from Claude.
Frequently Asked Questions
Claude tends to be more conservative with edits, preserving your original phrasing more closely. It's especially strong with long-form content and academic writing where maintaining the author's voice matters.
Anthropic's API usage policy states that API inputs and outputs are not used to train their models. Your text is processed and discarded, making it suitable for sensitive documents.
Claude Sonnet 4.5 costs about $3 per million input tokens. A full page of grammar corrections typically costs less than a penny, making it a cost-effective alternative to subscription-based grammar tools.
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