Instant Corrections
Grammar, spelling, and clarity fixed the moment you ask. Local AI, near-instant, no lag.
Please receive your file.
WRITING ASSISTANT FOR macOS
Write it once. Get it right.
GrammarGem fixes your grammar, sharpens your tone, and rewrites anything — instantly, in every app. 100% on-device. Your words never leave your Mac.
- 100% On-Device
- One-Time Purchase
- Works Everywhere
Loved by 4,000+ Founders
GrammarGem
You type
Press⌘;to fix
GrammarGem
…
Processed on-device · 0 bytes sent to the cloud
One hotkey. Every app you already use.
GrammarGem lives system-wide. Highlight text anywhere and fix or rewrite it in place — no copy-paste, no switching windows.
- Slack
- Notion
- Chrome
- Messages
- Docs
- VS Code
- X
- Word
FASTER EMAIL
Reply to email in half the time.
Dump a rough thought. GrammarGem shapes it into something you'd actually send — in your tone, not a robot's.
Rough note
got ur email — can do mon. will send the deck b4 then + loop in priya
GrammarGem
Thanks for your email — Monday works for me. I'll send the deck beforehand and loop in Priya.
EVERY CHANNEL
Sound sharp in every DM and post.
Punchy for X, warm for a teammate, formal for a client. GrammarGem matches the room automatically.
- Casual
yep shipping it today, will ping you when it's live 🚀
- Professional
We're shipping today — I'll let you know the moment it's live.
- Punchy
Shipping today. You'll know the second it's live.
FEATURES
Everything Grammarly does — minus the subscription and the surveillance.
Private by Design
Everything runs on your Mac's Neural Engine. Your writing is never uploaded, logged, or trained on. Ever.
0 bytes sent
processed on-device
Global Hotkey
Fix or rewrite selected text in any app with one keypress. Set your own shortcut.
Personal Dictionary
Teach GrammarGem your names, brand terms, and jargon once — it stops “correcting” them forever.
Ask & Rewrite
Select text, give a command: “make it shorter,” “more formal,” “translate to German.” Done in place.
make it shorterLet's meet Tuesday.
Writing Modes
Email, Slack, Post, Academic, Code-comment — switch the tone instantly while you write.
App-Aware
GrammarGem detects the app or site and applies the right Mode automatically.
WRITING MODES
Write for the moment.
Save a prompt for each context, then switch with a click.
You wrote
tell maria the onboarding copy is done and screenshots are coming
GrammarGemlight cleanup
Tell Maria the onboarding copy is done and the screenshots are coming.
APP-AWARE MODES
It knows where you are.
GrammarGem matches the active app to the right Mode — no manual toggling.
app-aware
App detected: Mail
Mode: Professional Email
Applied settings
- Tone
- Warm, professional
- Length cap
- 120 words
- Auto-format
- Greeting + sign-off
WALL OF LOVE
They stopped renewing Grammarly.
I was paying $144 a year to have my writing read by a server. Paid for GrammarGem once and never looked back.
Alex R.Indie founder It fixes things before I even notice them, and nothing leaves my laptop. That's the whole pitch and it delivers.
Sam K.Freelance writer Academic mode tightened my abstract in one keypress. Offline on the train, which Grammarly never managed.
Priya M.PhD candidate The app-aware modes are uncanny — punchy in X, buttoned-up in Mail, all automatic. I stopped thinking about it.
Jordan T.Product marketer It rewrites my commit messages and PR descriptions locally. No subscription, no telemetry, no nonsense.
Noah B.Software engineer English is my third language. GrammarGem makes me sound fluent in client emails without sending them anywhere.
Lena F.Non-native English speaker
Marcus D.
Startup founder
I was paying a subscription every month just to have my writing checked on someone else's servers. GrammarGem does the same thing — better, and entirely on my Mac. One payment and it's mine forever — such a bargain. 👍
PRICING
Buy once. Write forever.
No subscription. No per-seat fees. One payment, lifetime updates.
Grammarly Pro: ~$144 / year, every year. GrammarGem: pay once.
- One-time purchase
- Lifetime updates
- 14-day refund
- Most popular
Personal
$59lifetime2 Macs
- Everything in Solo
- Best value for desk + laptop
- Priority updates
Apple Silicon · macOS 14+ · 14-day money-back guarantee, no questions asked.
- 200k+Downloads
- 4.9Avg. rating
- $0/moNo subscription
Everything you might ask.
BUILT IN PUBLIC
Open about how it works.
GrammarGem is built in public. The grammar core is open-source, the codebase is permissively licensed, and there's no hidden telemetry — you can read exactly what the app does and how it handles your words. We sell the signed, notarized, auto-updating build and your license, not secrecy.