FracTree vs BioViewer
Price, ratings, monetisation and update history for both apps, side by side — with what reviewers say about each.
FracTree
Explore the fascinating world of fractal trees with this intuitive iOS app. Experiment with different shapes and appearances using touch gestures and sliders. Save your creations and export them as high-quality images or PDFs.
- Intuitive touch controls for shape manipulation
- Sliders to alter tree appearance
- Manual value input for controls
- Random tree generation
- Save favorite fractal trees
- Export art as PNG, JPG, or PDF
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FracTree is the most "fun" you can have exploring fractal trees on your iOS device! FracTree is a fun and intuitive way to discover the magic of branching and algorithms. Drag, tap, and pinch to find your favorite one! Nifty features: • drag the control targets to easily change the tree shape • use the sliders to alter the tree appearance • tap and double-tap controls to manually enter values • tap the dice for a completely random one; surprise! • save your favorites for later retrieval • export your fractal tree art as png/jpg or resolution-independent pdf • super-handy guide Seriously though, I really dig stuff like this and I hope you'll like it too. That's why I made it!
BioViewer
Visualize 3D molecular structures from .pdb files on iOS, iPadOS, and macOS. Features smooth rendering, drag-and-drop support, and publication-quality photo exports for detailed analysis.
- 3D molecular structure visualization
- Supports .pdb and .xyz files
- Drag and drop functionality
- Photo Mode with high-quality exports
- Multi-model PDB support
- Optimized for ProMotion displays
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A .pdb protein visualizer for iOS, iPadOS and macOS. View the 3D representation of any molecular structure from a .pdb file, using our custom Metal-based rendering engine based to allow for a smooth experience even in the biggest proteins. - Full drag and drop support for .pdb and .xyz files. - Photo Mode with publication-quality exports. - Support for multi-model PDBs. - Support for high refresh rate ProMotion displays.
Screenshots
Verdict
The clearest difference is review sentiment: FracTree at 100% against BioViewer's 33%. FracTree also leads on rating (5.0 vs 1.0) and iOS requirement (9.0 vs 17.0). BioViewer's advantage is update cadence (every 9 days vs every 7 months). On price, ratings volume, ads and in-app purchases there is nothing between them.
Scored on Price · Rating · Positive reviews · Number of ratings · Update frequency · Ads · In-app purchases · Monetization · Best chart rank · Devices · Requires iOS
Both are free to download. Neither carries in-app purchases, so what you see is what you pay.
FracTree holds the better App Store score, 5.0 against 1.0. Both are backed by a comparable volume of ratings — 2 and 1 respectively. Written reviews point the same way: 100% of FracTree's written reviews are positive against 33% of BioViewer's.
FracTree ships an update every 7 months, BioViewer every 9 days. The most recent releases landed on October 24, 2026 and October 14, 2026 respectively.
| Parameter | FracTree | BioViewer |
|---|---|---|
| Price | Free | Free |
| Rating | 5.0 (2 ratings) — better | 1.0 (1 ratings) |
| Positive reviews | 100.0% of reviews — better | 33.3% of reviews |
| Number of ratings | 2 — better | 1 |
| Update frequency | Every 7 months | Every 9 days — better |
| Ads | No | No |
| In-app purchases | No | No |
| Monetization | Free | Free |
| Devices | iPhone, iPad, iPod | iPhone, iPad, Mac |
| Requires iOS | 9.0 — better | 17.0 |
| Further details — not scored | ||
| Size | 2 MB | 9 MB |
| Age rating | 4+ | 4+ |
| Developer | Jeff Menter | Raul Monton Pinillos |
Customer experience
FracTree
BioViewer
In-app purchases
FracTree
No in-app purchases
BioViewer
No in-app purchases
