Overview

Refine is a privacy-focused, offline grammar and fluency checker for macOS that processes all text locally on your device without requiring internet connectivity or cloud uploads. It integrates with virtually every Mac app including Mail, Messages, Safari, Chrome, Pages, Word, Slack, and Notion, providing real-time grammar suggestions as you type. With support for 50+ languages and regional dialects, custom prompts for personalized checking, and optional BYOK integration with ChatGPT, Claude, and Gemini for advanced features, Refine offers instant, private writing assistance without compromising your data.

Pricing: $59 (lifetime, 3 devices)

Architecture: Apple Silicon, Intel

Key Features

100% offline AI processing - all text stays on your device
Real-time grammar and fluency suggestions as you type
AI explanations for each correction with one-click 'Explain' button
Support for 50+ languages and regional dialects
Works across Mail, Messages, Safari, Chrome, Pages, Word, Slack, Notion, and more
Custom prompts for personalized checking (tone, style guides, error types)
Automatic real-time checking or manual mode via keyboard shortcuts
BYOK support for OpenAI, Anthropic, and Google API keys
PopClip extension for quick text editing
7-day free trial with no credit card required
30-day money-back guarantee
One-time lifetime license with all v1.x updates included