# FracTree vs BioViewer

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.

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.

## The numbers

| Metric | FracTree | BioViewer |
| --- | --- | --- |
| Price | Free | Free |
| Rating | **[5.0 (2 ratings)](https://appshunter.io/ios/app/fractree/id1198055195/reviews)** | [1.0 (1 ratings)](https://appshunter.io/ios/app/bioviewer/id1593006498/reviews) |
| Number of ratings | **2** | 1 |
| Positive reviews | **100.0% of reviews** | 33.3% of reviews |
| In-app purchases | No | No |
| Ads | No | No |
| Update frequency | Every 7 months | **Every 9 days** |
| Monetization | Free | Free |
| Size | 2 MB | 9 MB |
| Requires iOS | **9.0** | 17.0 |
| Devices | iPhone, iPad, iPod | iPhone, iPad, Mac |
| Age rating | 4+ | 4+ |
| Developer | [Jeff Menter](https://appshunter.io/developer/403539646) | [Raul Monton Pinillos](https://appshunter.io/developer/1576884003) |

## What reviewers say

### FracTree

[App page](https://appshunter.io/ios/app/fractree/id1198055195)

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.

**Highlights:** 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

**Features:** macOS Compatibility

**In-app purchases:** none


### BioViewer

[App page](https://appshunter.io/ios/app/bioviewer/id1593006498)

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.

**Highlights:** 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

**In-app purchases:** none


## Frequently asked questions

### Is FracTree free?

FracTree is free to download, with no in-app purchases.

### Is BioViewer free?

BioViewer is free to download, with no in-app purchases.

### Which has better reviews, FracTree or BioViewer?

FracTree is rated higher. FracTree averages 5.0 out of 5 from 2 ratings, while BioViewer averages 1.0 from 1 ratings.

### Do FracTree or BioViewer have ads?

Neither FracTree nor BioViewer shows ads.

### Which is updated more often, FracTree or BioViewer?

FracTree ships an update every 7 months, and BioViewer every 9 days. Most recently, FracTree was updated on October 24, 2026 and BioViewer on October 14, 2026.

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*Compared by [AppsHunter](https://appshunter.io/) from daily US App Store data. Review summaries are generated from verbatim App Store reviews.*