# CitSci vs Zooniverse

The clearest difference is rating: CitSci at 4.5 against Zooniverse's 3.7. Zooniverse's advantage is ratings volume (37 vs 2). On price, update cadence, 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.

CitSci holds the better App Store score, 4.5 against 3.7. That said, the two scores are not equally well evidenced: Zooniverse has 37 ratings behind it against 2, so its average is the more settled of the two.

CitSci ships an update every 6 weeks, Zooniverse every 2 months. The most recent releases landed on September 10, 2026 and September 14, 2026 respectively.

## The numbers

| Metric | CitSci | Zooniverse |
| --- | --- | --- |
| Price | Free | Free |
| Rating | **[4.5 (2 ratings)](https://appshunter.io/ios/app/citsci/id657196305/reviews)** | [3.7 (37 ratings)](https://appshunter.io/ios/app/zooniverse/id1194130243/reviews) |
| Number of ratings | 2 | **37** |
| Positive reviews | — | 58.8% of reviews |
| In-app purchases | No | No |
| Ads | No | No |
| Update frequency | **Every 6 weeks** | Every 2 months |
| Monetization | Free | Free |
| Size | 33 MB | 50 MB |
| Requires iOS | **15.0** | 15.1 |
| Devices | iPhone, iPod | **iPhone, iPad, iPod** |
| Age rating | 4+ | 4+ |
| Developer | [Greg Newman](https://appshunter.io/developer/1536428997) | [Zooniverse](https://appshunter.io/developer/1851894671) |

## What reviewers say

### CitSci

[App page](https://appshunter.io/ios/app/citsci/id657196305)

Empower your community with a tool for collecting and uploading scientific observations. This app facilitates citizen science projects, allowing users to contribute valuable data directly to a central platform.

**Highlights:** Data collection for citizen science, Upload observations to CitSci.org, Empowers community science projects, Syncs with web platform, Facilitates observation contribution

**Features:** macOS Compatibility

**In-app purchases:** none


### Zooniverse

[App page](https://appshunter.io/ios/app/zooniverse/id1194130243)

Participate in real scientific research by classifying data for projects across various disciplines. Contribute to discoveries and datasets that advance knowledge, all from your mobile device. This platform connects volunteers with professional researchers for impactful citizen science.

**Highlights:** People-powered research platform, Volunteer opportunities, Access to mobile-friendly projects, Push notification updates, View publications, Contribute to scientific discoveries

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

**In-app purchases:** none


## Frequently asked questions

### Is CitSci free?

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

### Is Zooniverse free?

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

### Which has better reviews, CitSci or Zooniverse?

CitSci is rated higher. CitSci averages 4.5 out of 5 from 2 ratings, while Zooniverse averages 3.7 from 37 ratings.

### Do CitSci or Zooniverse have ads?

Neither CitSci nor Zooniverse shows ads.

### Which is updated more often, CitSci or Zooniverse?

CitSci ships an update every 6 weeks, and Zooniverse every 2 months. Most recently, CitSci was updated on September 10, 2026 and Zooniverse on September 14, 2026.

---

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