justRead.app vs Black Hole Sandbox
A side-by-side comparison built from both listings. Blank cells mean the company has not given that detail; we never guess.
justRead.app compared with Black Hole Sandbox
| Detail | 
justRead.app | 
Black Hole Sandbox |
|---|
| What it does | Native EPUB, PDF, comic and audiobook reader for iPhone and iPad with full customization and Calibre sync
| A realistic black hole, in your pocket
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| Stage | Startup
| Not given
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| Founded | 2024
| Not given
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| Based in | Not given
| Not given
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| Pricing model | Free trial
| Free
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| Pricing | Not given
| Not given
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| Key features | - Supports EPUB, PDF, CBZ, CBR comics, and audiobooks in m4b, mp3, m4a, aac and flac formats
- Customizable fonts, colors, margins, spacing and layout
- Cloud sync through iCloud, Dropbox, Google Drive or OneDrive
- Calibre library integration with two-way sync
- Reading statistics with streaks, heatmaps and achievements
- Full-text search across entire books
- Import custom fonts and apply them immediately
| - Real-time ray tracing through curved spacetime
- Augmented reality view of black hole
- 37 color palettes and custom colors
- Customizable accretion disc textures
- Emoji swarm replacement for accretion disc
- Upload custom photos to accretion disc
- Interactive orbit and zoom controls
- Save custom presets
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| What makes it different | - No account, no analytics, no tracking - your books and reading data stay on your devices and in your own cloud
- Four different book formats share one unified library with synchronized progress
- Complete customization of typography, colors, spacing and layout without compromises
- Native iOS experience built from the ground up for iPhone and iPad
- Handles libraries of 5,000+ books without slowdowns
| - Scientifically accurate simulation using general relativity equations
- Real-time physics applied to personal photos and emojis
- Blend between realistic and impossible designs
- Watch lensing effects on your actual room in AR
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| Community votes | 0 | 0 |
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| DR (Domain Rating by Ahrefs) | 20 ▲ +1 (up) since last check | 23 ▼ −1 (down) since last check |
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| Trust Flow (Majestic) | 25 | 0 |
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| Citation Flow (Majestic) | 26 | 21 |
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| Referring domains (Majestic) | 96 | 12 |
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4 details filled in for both companies.
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