# Biosphere 2 vs Durango Public Library Catalog

Biosphere 2 and Durango Public Library Catalog both sit at 3.5 stars, but that hides the real split: 22% of Biosphere 2's written reviews are positive against 0% of Durango Public Library Catalog's. Biosphere 2 also leads on ratings volume (30 vs 5). On price, rating, update cadence and ads there is nothing between them.

Both are free to download. Neither carries in-app purchases, so what you see is what you pay.

On the App Store both sit at effectively the same score — 3.5 for Biosphere 2 against 3.4 for Durango Public Library Catalog. That said, the two scores are not equally well evidenced: Biosphere 2 has 30 ratings behind it against 5, so its average is the more settled of the two. Written reviews are what separate them: 22% of Biosphere 2's written reviews are positive against 0% of Durango Public Library Catalog's.

Both ship on a similar rhythm, roughly every 3 months. Both last shipped on November 3, 2026.

## The numbers

| Metric | Biosphere 2 | Durango Public Library Catalog |
| --- | --- | --- |
| Price | Free | Free |
| Rating | **[3.5 (30 ratings)](https://appshunter.io/ios/app/biosphere-2/id1512454025/reviews)** | [3.4 (5 ratings)](https://appshunter.io/ios/app/durango-public-library-catalog/id1526328296/reviews) |
| Number of ratings | **30** | 5 |
| Positive reviews | **22.2% of reviews** | 0.0% of reviews |
| In-app purchases | No | No |
| Ads | No | No |
| Update frequency | Every 3 months | Every 3 months |
| Monetization | Free | Free |
| Size | 137 MB | 29 MB |
| Requires iOS | **15.1** | 16.2 |
| Devices | **iPhone, iPad, iPod** | iPhone, iPad |
| Age rating | 4+ | 12+ |
| Developer | [University of Arizona](https://appshunter.io/developer/437682109) | [City of Durango (Durango Public Library)](https://appshunter.io/developer/1526328298) |

## What reviewers say

### Biosphere 2

[App page](https://appshunter.io/ios/app/biosphere-2/id1512454025)

Explore the history, architecture, and science of a unique research facility. This family-friendly guide offers an accessible way to learn about its groundbreaking discoveries and 30 years of operation.

**Highlights:** Explore facility history, Learn about architecture, Discover groundbreaking science, Family-friendly guide, Accessible educational content

**Features:** macOS Compatibility, Vision Pro support

**In-app purchases:** none


### Durango Public Library Catalog

[App page](https://appshunter.io/ios/app/durango-public-library-catalog/id1526328296)

Manage your library account on the go. Search the catalog, place holds, and renew borrowed items directly from your mobile device.

**Highlights:** Manage library account, Search catalog, Renew books, Reserve books, Access from mobile device

**In-app purchases:** none


## Frequently asked questions

### Is Biosphere 2 free?

Biosphere 2 is free to download, with no in-app purchases.

### Is Durango Public Library Catalog free?

Durango Public Library Catalog is free to download, with no in-app purchases.

### Which has better reviews, Biosphere 2 or Durango Public Library Catalog?

Biosphere 2 is rated higher. Biosphere 2 averages 3.5 out of 5 from 30 ratings, while Durango Public Library Catalog averages 3.4 from 5 ratings.

### Do Biosphere 2 or Durango Public Library Catalog have ads?

Neither Biosphere 2 nor Durango Public Library Catalog shows ads.

### Which is updated more often, Biosphere 2 or Durango Public Library Catalog?

Biosphere 2 ships an update every 3 months, and Durango Public Library Catalog every 3 months. Most recently, Biosphere 2 was updated on November 3, 2026 and Durango Public Library Catalog on November 3, 2026.

---

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