A social reading app for organizing your library, discovering books, and sharing ideas with curious readers
Stage
Not given
Not given
Founded
Not given
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Based in
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CH
Pricing model
Open source
Freemium
Pricing
Not given
Free: Tracking your library and your reading, stats, Discover and the feed. Premium: Optional subscription available in the app with features including advanced reading stats, unlimited shelves, unlimited AI reading chats, AI assistants (20 actions a day free, unlimited on Premium), AI index scannin
Key features
GitHub city visualization showing repos as buildings and districts
Living profile with daily journal, activity score and streaks
End-to-end encrypted private note sharing
AI agent and coding activity visualization
World map showing all members' cities and neighborhoods
Asks and offers with gravity rewards
Read-only GitHub integration with no code access
Self-hosted profile export to static site
Mobile support on iOS and Android
Cryptographic identity key stored locally in vault
Page-by-page reading tracker
Book barcode scanner
Goodreads library import
AI reading chats
Social feed for book discussions
Reader matching
Half-star ratings
Private notes and highlights
In-app PDF reader
What makes it different
Free and open source with no telemetry
Visualizes GitHub activity as a living city that updates automatically
Privacy by default: nothing leaves your Obsidian vault unless you explicitly choose
Sign up with just GitHub, no installation required
Self-hosted option with open protocol
Built specifically for non-fiction readers with curated recommendations and discussion tuned to non-fiction
AI features connect insights across your personal books and notes
Reader matching against 300+ curated celebrity libraries
Highlights and notes stay linked to chapters for long-term reference
Caldera