AI-powered grammar checker and writing assistant for clear, error-free communication
Turn Substack articles into viral social posts
Stage
Established
Startup
Founded
2018
2025
Based in
US
Not given
Pricing model
Freemium
Freemium
Pricing
Free plan includes grammar and spelling checks, basic AI suggestions, limited paraphrasing, typing shortcuts, and browser extension. Linguix Pro costs $11.67/month (billed $140 annually) and includes advanced grammar and style suggestions, more AI-powered writing help, advanced paraphrasing, unlimit
Free: 10 credits (one-time). Monthly: $7/mo for 70 credits. Yearly: $65/yr for 600 credits.
Key features
AI-based writing assistant with grammar, punctuation and style suggestions
Text Rewriter to instantly rewrite sentences
Content Quality Score analyzing sentence length and vocabulary complexity
Intelligent shortcuts to reduce typing time by 90%
Style Guides for consistent corporate communications
Team Management with performance stats and employee activity reports
Works across multiple platforms including Gmail, Google Docs, and millions of websites
Advanced paraphrasing with tone, length, and clarity adjustments
Priority support for Pro subscribers
TYPE-FORMULA pipeline that extracts insight types (diagnostic, wisdom, contrarian, data-backed, framework, story) and applies viral structures
Knowledge Bank to store, browse, and reuse extracted insights
10+ viral formula structures including parallel repetition, conditional framework, and bridge analogy
Chrome extension for scheduling posts directly to Substack
Rich-text editor with HTML and plain text export
MCP integration for Claude and Cursor
Automatic article URL processing from published or draft posts
Priority processing for paid plan users
What makes it different
Supports six languages for global teams
Rewriting technology makes sentences compelling and native-sounding
Helps teams maintain brand voice consistency through shared style guides
Available across multiple apps and devices with single account
Designed specifically for Substack writers with formulas trained on viral patterns
Two-stage TYPE-FORMULA process instead of generic AI summarization
Knowledge Bank compounds over time as more articles are processed
From URL to scheduled post in minutes with no copy-paste needed
Linguix
Quick Viral Notes