Grammar Checker &
AI Writing Assistant
for Mac

Fix grammar mistakes instantly with Grambo's intelligent grammar checker. Get grammar correction, spelling fixes, and style improvements everywhere you type. Private by default, blazing fast, and works offline. Prefer zero setup? Enable Grambo Cloud.

Download for Mac

macOS 15+ 7-day free trial No credit card required

Private by default Fast offline AI Grambo Cloud for instant setup

See Grambo in Action

Watch how Grambo fixes grammar instantly with a single keyboard shortcut.

How to Use Grambo

Get started in seconds. Perfect writing is just a keyboard shortcut away.

Write Anywhere

Grambo works seamlessly across all your Mac applications.

Select Text

Select the text you want to check for grammar.

Press the Shortcut Key

⌘ ⇧ G

Perfect Writing

Apply fixes automatically and write with confidence.

Powerful Features for Perfect Writing

Offline by default for privacy and speed. Optional Cloud mode for non-technical users who want zero setup.

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Grammar Correction

Instantly detect and fix grammar mistakes with AI-powered suggestions tailored to your writing style.

Contextual Deep Learning

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Spelling & Punctuation

Catch typos, spelling errors, and punctuation mistakes before they reach your audience.

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Style Enhancement

Improve clarity, conciseness, and readability with intelligent style recommendations.

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Real-Time Analysis

Instant results with on-device processing. Enable Grambo Cloud mode only if you prefer zero setup.

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Privacy First

Your writing stays on your Mac by default. Nothing is sent to our servers unless you enable Grambo Cloud.

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Native Mac App

Beautiful, lightweight interface designed specifically for macOS with dark mode support.

Developer Freedom

More Power When You Need It

Grambo runs offline on your Mac by default for maximum privacy and speed. For extra flexibility, you can enable Grambo Cloud (instant setup) or connect your own API keys for premium models.

🔑

Bring Your Own Key

Use your own API keys from OpenAI, Anthropic, or Google. No middleman, just you and the provider.

✨

Access Premium Models

Use premium models by GPT, Claude and Gemini directly within the app.

🛡️

Your Keys Stay Private

Stored securely in your Mac's keychain. We never see or access them.

⚡

Switch Instantly

Toggle between local and cloud models with one click.

Default: 100% Offline – Grambo runs locally on your Mac for maximum privacy and speed. Nothing is sent to our servers unless you enable Grambo Cloud. You can also use BYOK to connect premium models with your own keys.

📖 Learn how to get your own API keys from OpenAI, Anthropic, or Google →

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Works Seamlessly Across Your Mac

Zero configuration required. Begin typing anywhere, and receive real-time grammar assistance instantly.

Safari

Chrome

Mail

Messages

Slack

Notion

Word

Pages

Notes

Discord

Obsidian

Bear

And all other Mac apps

90+

Languages

Write fluently across the globe. Grambo supports over 90 languages, making it the perfect companion for multilingual creators and global teams.

English Spanish French German Portuguese Chinese Japanese Korean Italian Russian Arabic Hindi Dutch Polish Swedish Turkish Ukrainian Romanian +72 More

Simple, transparent pricing

Grambo is offline by default for privacy and speed. Choose Monthly for Grambo Cloud + Offline + BYOK, or Lifetime for Offline + BYOK.

Monthly

$ 2.99 /month

Best for Grambo Cloud (instant setup)

check_circle Grambo Cloud (instant setup)
check_circle Offline AI processing
check_circle Bring your own API key
check_circle All grammar checking features
check_circle Works across all apps
check_circle 90+ languages support
check_circle Cancel anytime
check_circle Use on up to 3 devices

Get Monthly Access

Lifetime

🚀 Launch Offer

$ 14.99

$39.99 one-time

Pay once, use forever

check_circle Offline AI processing
check_circle Bring your own API key
check_circle All grammar checking features
check_circle Works across all apps
check_circle 90+ languages support
check_circle All future updates included
check_circle No recurring payments
check_circle Use on up to 3 devices
cancel Grambo Cloud not included

Get Lifetime Access

Grambo runs offline by default. Grambo Cloud is optional and available with the Monthly plan. Start with a 7-day free trial, no credit card required.

Frequently asked questions

Can't find the answer you're looking for? Feel free to send us an email at support@gramboapp.com

How does Grambo protect my privacy? expand_more

Grambo is private by default. Everything runs locally on your Mac for maximum privacy and speed. We don't send your writing to our servers unless you enable Grambo Cloud.

Which applications are supported? expand_more

Grambo integrates with virtually all Mac applications—from Mail and Messages to Safari, Chrome, Pages, Word, Slack, Notion, and countless others.

What are the system requirements? expand_more

You'll need macOS 14.0 or newer running on Apple Silicon (M1/M2/M3 chips). 8GB RAM is typically sufficient for smooth performance.

Can I try before purchasing? expand_more

Yes! Download Grambo and enjoy 7-day free access. Offline mode works instantly, and you can enable Grambo Cloud anytime if you prefer zero setup.

What's included with lifetime access? expand_more

Lifetime access covers all updates, bug fixes, and feature additions within the current major version. Our commitment is to continuously improve your experience.

What is Grambo Cloud? expand_more

Grambo Cloud is an optional mode that gives you instant setup with no local downloads or API keys. Your writing stays on your Mac by default, and only selected text is processed when you choose to use Cloud mode.

How do I get my own API keys for BYOK? expand_more

Getting your own API keys is easy! You can obtain them directly from OpenAI, Anthropic (Claude), or Google (Gemini). Read our step-by-step guide to learn how to get API keys and set them up in Grambo.

How do I set up Local AI models in Grambo? expand_more

Setting up Local AI is simple with our auto setup feature! Choose "Local AI" as your service type in Settings, select your preferred model (Llama 3.2 3B or Qwen 3 1.7B), and click the Auto Setup button. Read our complete Local AI setup guide for detailed instructions, model comparisons, and troubleshooting tips.

Transform Your Writing Today

Join Mac users who write with more confidence using Grambo every day.