Grambo
Grammar checker & AI writing assistant for Mac
Overview
Grambo is an intelligent writing assistant that detects and corrects grammar, spelling, and punctuation errors across all macOS applications. It runs offline by default using local AI models (Llama 3.2, Qwen 3) for privacy, with optional cloud connectivity and BYOK support for OpenAI, Anthropic, and Google APIs. Supporting 90+ languages, Grambo works system-wide in Safari, Chrome, Mail, Slack, Notion, Word, and more.
Pricing: $2.99/month (Cloud + offline + BYOK) | $14.99 one-time (offline + BYOK)
Minimum macOS: 14.0 (Sonoma)
Architecture: Apple Silicon
Key Features
- AI-powered grammar, spelling, and punctuation correction
- Offline by default with on-device processing for privacy
- Local AI models: Llama 3.2 3B and Qwen 3 1.7B with auto-setup
- Grambo Cloud for instant setup without local models
- BYOK support for OpenAI, Anthropic (Claude), and Google (Gemini) APIs
- System-wide support across all macOS applications
- Style enhancement and clarity suggestions
- Real-time analysis while typing
- Support for 90+ languages
- API keys secured in macOS Keychain
- Native macOS app with dark mode support
- 7-day free trial, no credit card required
Tags
Grambo Alternatives
Refine
Offline AI grammar checker that works everywhere on macOS
LanguageTool
AI-powered grammar, style, and spell checker for macOS
Writing Tools
Apple Intelligence-inspired system-wide grammar assistant
Poli
On-device AI writing tools that work everywhere on Mac