# CitSci vs Gaiaxus

The clearest difference is rating: Gaiaxus at 5.0 against CitSci's 4.5. On price, ratings volume, 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.

Gaiaxus holds the better App Store score, 5.0 against 4.5. Both are backed by a comparable volume of ratings — 2 and 1 respectively.

CitSci ships an update every 6 weeks, Gaiaxus every 2 months. The most recent releases landed on October 23, 2026 and October 11, 2026 respectively.

## The numbers

| Metric | CitSci | Gaiaxus |
| --- | --- | --- |
| Price | Free | Free |
| Rating | [4.5 (2 ratings)](https://appshunter.io/ios/app/citsci/id657196305/reviews) | **[5.0 (1 ratings)](https://appshunter.io/ios/app/gaiaxus/id6748620502/reviews)** |
| Number of ratings | **2** | 1 |
| In-app purchases | No | No |
| Ads | No | No |
| Update frequency | **Every 6 weeks** | Every 2 months |
| Monetization | Free | Free |
| Size | 33 MB | 75 MB |
| Requires iOS | **15.0** | 15.1 |
| Devices | iPhone, iPod | iPhone, iPod |
| Age rating | 4+ | 4+ |
| Developer | [Greg Newman](https://appshunter.io/developer/1536428997) | [GaiaXus LLC](https://appshunter.io/developer/1826606292) |

## 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


### Gaiaxus

[App page](https://appshunter.io/ios/app/gaiaxus/id6748620502)

This app enables users to monitor water quality using a connected sensor, collecting data on temperature, turbidity, salinity, and more. It offers interactive learning modules for environmental education, suitable for students and citizen scientists.

**Highlights:** Real-time water quality data collection, Temperature, turbidity, salinity, pH, chlorophyll monitoring, Interactive educator-designed learning modules, Field data collection and viewing, Supports K-12 students, citizen scientists, and researchers

**Features:** macOS Compatibility

**In-app purchases:** none


## Frequently asked questions

### Is CitSci free?

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

### Is Gaiaxus free?

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

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

Gaiaxus is rated higher. CitSci averages 4.5 out of 5 from 2 ratings, while Gaiaxus averages 5.0 from 1 ratings.

### Do CitSci or Gaiaxus have ads?

Neither CitSci nor Gaiaxus shows ads.

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

CitSci ships an update every 6 weeks, and Gaiaxus every 2 months. Most recently, CitSci was updated on October 23, 2026 and Gaiaxus on October 11, 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.*