Not Grammarly
What Not Grammarly is
Not Grammarly is a free desktop writing app for macOS, Windows, and Linux. It checks grammar, explains its corrections, and provides a score for the text. Style controls offer formal, informal, and concise rewrites, with support for English, Spanish, Portuguese, and additional languages. You can change the interface with light or dark themes and transparency controls. An always-on-top window keeps the app available while you work elsewhere, while Ctrl+Shift+G analyzes text copied from any application. The project says it uses OpenAI to improve writing, and each user must supply a personal OpenAI API key. macOS downloads are available as DMG and ZIP files for Apple Silicon Macs with M1, M2, or M3 chips. Windows 10/11 and Linux versions are listed as coming soon. The app is MIT licensed and links to GitHub issues and Buy Me a Coffee for support.
Who it suits
It suits writers who want desktop grammar explanations and style options across multiple languages. It is also useful for people who work across applications and can provide their own OpenAI API key.
What it does well
- Grammar corrections include explanations and scoring
- Formal, informal, and concise style options
- Clipboard shortcut works from any application
- Light, dark, and transparent appearance controls
- MIT-licensed desktop project
What to know first
- Requires your own OpenAI API key
- Windows 10/11 version is listed as coming soon
- Linux version is listed as coming soon
- macOS downloads target Apple Silicon chips
Plans
| Plan | Billed and limits | Price |
|---|---|---|
| Not Grammarly | Requires your own OpenAI API key | Free |
As not-grammarly.com lists them, read 12 Oct 2026. The maker's own page has the final word.
Verdict
Not Grammarly combines grammar feedback, style refinement, and cross-application clipboard analysis in a free desktop package. Check platform availability and the requirement for your own OpenAI API key before choosing it.
Facts from Not Grammarly's own pages
- AI provider
- The project says it uses OpenAI to improve writing. · github.com, 12 Oct 2026
- API key
- Users need to provide their own OpenAI API key. · github.com, 12 Oct 2026
- Appearance
- It offers light and dark themes and transparency controls. · not-grammarly.com, 12 Oct 2026
- Desktop app
- Yes · not-grammarly.com, 21 Sept 2026
- Free plan
- Yes · not-grammarly.com, 21 Sept 2026
- Grammar checking
- It provides grammar corrections with detailed explanations and scoring. · not-grammarly.com, 12 Oct 2026
- Languages
- It supports English, Spanish, Portuguese, and more. · not-grammarly.com, 12 Oct 2026
- License
- The project README identifies the software as MIT licensed. · github.com, 12 Oct 2026
- Linux availability
- The Linux version is listed as coming soon. · not-grammarly.com, 12 Oct 2026
- macOS availability
- Downloads are offered for Apple Silicon Macs with M1, M2, or M3 chips as DMG and ZIP files. · not-grammarly.com, 12 Oct 2026
- Product
- Not Grammarly is a lightweight desktop app for improving writing. · not-grammarly.com, 12 Oct 2026
- Shortcut
- Ctrl+Shift+G analyzes clipboard text from any application. · not-grammarly.com, 12 Oct 2026
- Style suggestions
- Yes · not-grammarly.com, 21 Sept 2026
- Support
- The site links to GitHub issues and a Buy Me a Coffee support page. · not-grammarly.com, 12 Oct 2026
- Text refinement
- It offers formal, informal, and concise style options. · not-grammarly.com, 12 Oct 2026
- Window mode
- An always-on-top mode keeps the app accessible while working in other applications. · not-grammarly.com, 12 Oct 2026
- Windows availability
- The page lists Windows 10/11 and marks it as coming soon. · not-grammarly.com, 12 Oct 2026
Where Not Grammarly stands on Freedom251
- Grammar checkers#38 of 88