Caldera vs Tell the Sky
A side-by-side comparison built from both listings. Blank cells mean the company has not given that detail; we never guess.
Caldera compared with Tell the Sky
| Detail | 
Caldera | 
Tell the Sky |
|---|
| What it does | The social network for GitHub and Obsidian
| Send a message on a paper lantern and let it drift across the world on the real wind until a stranger catches it and sends it on
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| Stage | Not given
| Not given
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| Founded | Not given
| Not given
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| Based in | Not given
| Not given
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| Pricing model | Open source
| Free
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| Pricing | Not given
| Not given
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| 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
| - Send messages on digital lanterns that drift on real wind patterns
- Add messages to lanterns and send them on
- Catch up to three lanterns per day
- Live world map showing lantern journeys
- Sign in with email, Google or Apple
- Customizable notifications and quiet hours
- Report and block users with moderation system
- Set location to receive lanterns
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| 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
| - Messages drift on real wind patterns across a live world map
- Messages are added by multiple strangers as lanterns travel
- Emphasis on safety and kindness with content moderation
- Location-based delivery of messages to nearby users
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| Free plan | Not given
| Not given
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| Open source | Not given
| Not given
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| Platforms | Not given
| Not given
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| Public API | Not given
| Not given
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| Community votes | 0 | 0 |
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| DR (Domain Rating by Ahrefs) | 30 ▼ −1 (down) since last check | 2 ▲ +1 (up) since last check |
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| Trust Flow (Majestic) | 7 | 0 |
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| Citation Flow (Majestic) | 26 | 0 |
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| Referring domains (Majestic) | 21 | 0 |
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4 details filled in for both companies.
More alternatives to Caldera More alternatives to Tell the Sky