# Zooniverse vs iSeaTree

The clearest difference is rating: iSeaTree at 5.0 against Zooniverse's 3.7. iSeaTree also leads on review sentiment (100% vs 59%) and iOS requirement (10.0 vs 15.1). Zooniverse's advantage is ratings volume (38 vs 7). 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.

iSeaTree holds the better App Store score, 5.0 against 3.7. That said, the two scores are not equally well evidenced: Zooniverse has 38 ratings behind it against 7, so its average is the more settled of the two. Written reviews point the same way: 59% of Zooniverse's written reviews are positive against 100% of iSeaTree's.

Both ship on a similar rhythm, roughly every 2 months. The most recent releases landed on October 24, 2026 and October 20, 2026 respectively.

## The numbers

| Metric | Zooniverse | iSeaTree |
| --- | --- | --- |
| Price | Free | Free |
| Rating | [3.7 (38 ratings)](https://appshunter.io/ios/app/zooniverse/id1194130243/reviews) | **[5.0 (7 ratings)](https://appshunter.io/ios/app/iseatree/id1513633272/reviews)** |
| Number of ratings | **38** | 7 |
| Positive reviews | 58.8% of reviews | **100.0% of reviews** |
| In-app purchases | No | No |
| Ads | No | No |
| Update frequency | Every 2 months | Every 2 months |
| Monetization | Free | Free |
| Size | 50 MB | 36 MB |
| Requires iOS | 15.1 | **10.0** |
| Devices | iPhone, iPad, iPod | iPhone, iPad, iPod |
| Age rating | 4+ | 4+ |
| Developer | [Zooniverse](https://appshunter.io/developer/1851894671) | [DemocracyLab](https://appshunter.io/developer/1690712597) |

## What reviewers say

### 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


### iSeaTree

[App page](https://appshunter.io/ios/app/iseatree/id1513633272)

Identify trees using AI or manual input, calculate their environmental benefits, and share your findings on an interactive map. This free app is designed for users of all ages and skill levels across the USA and Canada.

**Highlights:** AI-powered tree identification, Manual tree identification, Tree benefits calculator (CO2, H2O, air quality), In-app map for sharing tree data, Suitable for all ages and skill levels, Supports USA and Canada

**In-app purchases:** none


## Frequently asked questions

### Is Zooniverse free?

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

### Is iSeaTree free?

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

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

iSeaTree is rated higher. Zooniverse averages 3.7 out of 5 from 38 ratings, while iSeaTree averages 5.0 from 7 ratings.

### Do Zooniverse or iSeaTree have ads?

Neither Zooniverse nor iSeaTree shows ads.

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

Zooniverse ships an update every 2 months, and iSeaTree every 2 months. Most recently, Zooniverse was updated on October 24, 2026 and iSeaTree on October 20, 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.*