# ✒️ GrammarGem
### Write it once. Get it right.
**The private, on-device writing assistant for Mac.**
Fix grammar, sharpen tone, and rewrite anything — in every app — for one payment, forever.
[**⬇️ Download GrammarGem**](https://www.grammargem.com/#pricing) · [Docs](https://www.grammargem.com/docs) · [How it works](https://www.grammargem.com)
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## Stop renting your grammar checker.
Grammarly costs around **$144 every year**, reads everything you type, and sends it to their servers. GrammarGem does the same job — **better** — entirely on your Mac, for a **single payment**.
Select text in any app, press one hotkey, and it’s polished in place. No copy-paste, no switching windows, and **nothing ever leaves your machine**.
> “One payment and it’s mine forever — such a bargain.” 👍
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## Why people switch
| | Grammarly | **GrammarGem** |
|---|:---:|:---:|
| **Price** | ~$144 / year, forever | **Pay once** |
| **Your words** | Sent to the cloud | **Never leave your Mac** |
| **Works offline** | ❌ | ✅ |
| **Where it works** | Where the extension reaches | **Every app, system-wide** |
| **Speed** | Round-trip to a server | **Instant, on-device** |
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## What you get
- ⚡ **Instant corrections** — grammar, spelling, punctuation, and clarity, fixed the moment you ask.
- 🔒 **Private by design** — everything runs on your Mac’s Neural Engine. Your writing is never uploaded, logged, or used to train a model.
- ⌨️ **One global hotkey** — fix or rewrite the selected text in any app: Mail, Slack, Notion, Chrome, Messages, VS Code, and more.
- ✨ **Ask & rewrite** — “make it shorter,” “more formal,” “translate to German” — done in place.
- 🎚️ **Writing Modes** — Email, Post, Team Chat, Academic, Code — switch the tone instantly, or let GrammarGem pick the right one for the app you’re in.
- 📖 **Personal dictionary** — teach it your names, brand terms, and jargon once; it stops “correcting” them forever.
- 🖥️ **A clean management app** — manage your devices, shortcuts, modes, and privacy from one tidy window.
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## Buy once. Write forever.
No subscription. No per-seat fees. One payment, lifetime updates.
| Plan | Price | Devices |
|------|:-----:|:-------:|
| **Solo** | $39 | 1 Mac |
| **Personal** ⭐ | $59 | 2 Macs |
| **Studio** | $89 | 4 Macs |
| **Startup License** | $159 | 10 Macs |
*Apple Silicon · macOS 14+ · 14-day money-back guarantee, no questions asked.*
[**⬇️ Get GrammarGem**](https://www.grammargem.com/#pricing)
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## FAQ
**Is my writing really private?**
Yes. Every correction and rewrite runs on your Mac. Your text is never uploaded, logged, or used for training.
**Do I need internet?**
No. Core features work fully offline.
**Is this a subscription?**
No — it’s a one-time purchase with lifetime updates and a 14-day money-back guarantee.
**What about plagiarism detection?**
GrammarGem is private-first, so it doesn’t do cloud plagiarism scanning — that would require sending your writing to a server. Everything else you’d expect is here.
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## Built in public
GrammarGem is open source under the **MIT License**. We believe a privacy tool should be one you can actually inspect. Issues and pull requests are welcome.
**[grammargem.com](https://www.grammargem.com)**
© 2026 FounderGem LLC · 1309 Coffeen Avenue STE 1200, Sheridan, WY 82801, USA