Not Grammarly
Not Grammarly: A focused, free Mac editor for explanations, scoring, and style refinement. Ranked #46 of 88 in Grammar Checkers by our editors (4.1/10); pricing: Free plan; best for mac users wanting AI-assisted editing.
At a glance
- Editor score4.1 / 10
- PricingFree plan
- Best forMac users wanting AI-assisted editing
- Free planYes
- Paid fromFree
- Facts checked21 Sep 2026
Where it wins
- Grammar corrections include explanations and scoring.
- Refines text in formal, informal, and concise styles.
- Free, open-source macOS app with clipboard analysis.
Where it doesn't
- Currently limited to macOS.
- Requires users to provide their own OpenAI API key.
- Limited integrations beyond OpenAI API support.
Our verdict on Not Grammarly
Not Grammarly is a free, open-source desktop grammar checker for macOS. It analyzes copied text and provides grammar corrections, explanations, scoring, and style refinement. Users can choose formal, informal, or concise output, with support for English, Spanish, Portuguese, and additional languages. The product fits Mac users who want a focused writing assistant rather than a broad, cross-platform editing service. Its global keyboard shortcut is designed for analyzing clipboard text, while light, dark, and system appearance settings support different desktop preferences.
The strongest part of the product is its focused editing workflow. Grammar feedback is paired with explanations and scoring, giving users more context than a correction alone. Text refinement adds a practical second layer for changing tone or brevity. Transparency controls and always-on-top mode provide additional control over how the app appears on the desktop. The MIT License and open-source distribution also suit users who prefer software with an openly distributed codebase. However, the workflow centers on copied text and a desktop app, so it is less suited to users who need editing built directly into many writing environments.
Pricing is straightforward: Not Grammarly is free, with no paid tiers described. The application uses the OpenAI API, and users must provide their own API key. That requirement is an important part of the setup and separates the product from tools that bundle access to their own service. Platform coverage is also narrow: macOS is currently available, while Windows is listed as coming soon. Choose Not Grammarly if you want free Mac-based grammar explanations, scoring, and AI-assisted refinement. Choose an alternative if you need broader platform coverage or a wider integration ecosystem.
Your product? Our editors can test Not Grammarly in depth and publish a review, labelled as paid · from $149/mo →
Not Grammarly pricing
Not Grammarly fact sheet
| Free plan | Yes |
|---|---|
| Paid from | Free |
| Browser extension | Not verified |
| Desktop app | Yes |
| Mobile app | Not verified |
| Style suggestions | Yes |
| Tone detection | Not verified |
| Languages supported | Not verified |
| Deployment | Desktop |
| Platforms | macOS |
| Support | Community |
| Built for | Solo, Small business (editorial estimate) |
| Integrations | 1 integrations: OpenAI API |
| Pricing | Free plan |
| Website | not-grammarly.com |
| Facts checked | 21 Sep 2026 |
Not Grammarly integrations
Not Grammarly lists 1 integrations on its own site.
- OpenAI API
Alternatives to Not Grammarly
- GrammarlyA broad writing assistant with strong grammar, tone, rewriting, and AI coverage.9.4
- LanguageToolA broad multilingual checker with open-source and self-hosting options.9.2
- Microsoft EditorA strong Microsoft 365 writing assistant with focused platform coverage.9.0
See all Not Grammarly alternatives →
Used Not Grammarly? Be the first to review it
The editor score above is our own research. What this page doesn't have yet is a reader's view — what you used Not Grammarly for, what worked and what didn't. No stars are seeded and no review is paid for; an editor reads every one before it appears.
Write a reviewTwo minutes · verified accounts only · read by an editor before it appears
Featured on iTechGuides
Not Grammarly is listed in our Grammar Checkers directory. Add the badge to your site — it links back to this page.
<a href="https://www.itechguides.com/products/not-grammarly/"><img src="https://www.itechguides.com/best/badge/not-grammarly.svg" alt="Featured on iTechGuides" width="230" height="46"></a>
Reviewed by iTechGuides Editors · Editorial team · Updated Oct 2026
Advertiser disclosure: iTechGuides is reader-supported. Vendors can pay for top positions in our rankings and for a place on other products' pages, and we may earn a commission when you click some links. Bought places stand at the number bought; this page and our disclosure say so. Paying vendors may get a fuller, more detailed review from our editors, and that review can change their score. How we rank.
Last updated · How we research and update