AI-powered macOS writing assistant for grammar, translation, and productivity
Turn Substack articles into viral social posts
Stage
Not given
Startup
Founded
Not given
2025
Based in
DE
Not given
Pricing model
Paid
Freemium
Pricing
$29 one-time for Standard license (1 device), $59 one-time for Pro license (3 devices). Optional RewriteBar Gateway Credits: 100 once for $29 plan, 100 once for $59 plan, 3 million per month available. Free trial with up to 100 corrections.
Free: 10 credits (one-time). Monthly: $7/mo for 70 credits. Yearly: $65/yr for 600 credits.
Key features
Custom AI actions and workflows
Side-by-side text comparison
Keyboard shortcuts
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
Works in any macOS app without switching applications
Lightweight and privacy-focused design
Customizable AI workflows with preset templates
One-time purchase with lifetime access
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
RewriteBar
Quick Viral Notes