# EDDMapS vs Project Monarch Science

The clearest difference is rating: EDDMapS at 4.7 against Project Monarch Science's 3.7. EDDMapS also leads on review sentiment (57% vs 45%) and ratings volume (120 vs 18). Project Monarch Science's advantage is update cadence (weekly vs monthly) and iOS requirement (15.0 vs 18.6). On price, ads, in-app purchases and monetization model there is nothing between them.

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

EDDMapS holds the better App Store score, 4.7 against 3.7. That said, the two scores are not equally well evidenced: EDDMapS has 120 ratings behind it against 18, so its average is the more settled of the two. Written reviews point the same way: 57% of EDDMapS's written reviews are positive against 45% of Project Monarch Science's.

EDDMapS ships an update monthly, Project Monarch Science weekly. The most recent releases landed on September 25, 2026 and September 21, 2026 respectively.

## The numbers

| Metric | EDDMapS | Project Monarch Science |
| --- | --- | --- |
| Price | Free | Free |
| Rating | **[4.7 (120 ratings)](https://appshunter.io/ios/app/eddmaps/id1497390237/reviews)** | [3.7 (18 ratings)](https://appshunter.io/ios/app/project-monarch-science/id6460006970/reviews) |
| Number of ratings | **120** | 18 |
| Positive reviews | **57.1% of reviews** | 45.5% of reviews |
| In-app purchases | No | No |
| Ads | No | No |
| Update frequency | Monthly | **Weekly** |
| Monetization | Free | Free |
| Size | 251 MB | 83 MB |
| Requires iOS | 18.6 | **15.0** |
| Devices | iPhone, iPad | **iPhone, iPad, iPod** |
| Age rating | 4+ | 4+ |
| Developer | [Charles T. Bargeron](https://appshunter.io/developer/381326173) | [Cellular Tracking Technologies](https://appshunter.io/developer/1588087267) |

## What reviewers say

### EDDMapS

[App page](https://appshunter.io/ios/app/eddmaps/id1497390237)

Document and map the distribution of invasive species with this user-friendly system. It allows for easy data submission, visualization, and querying, aiding in early detection and rapid response efforts. All data is reviewed by experts for accuracy.

**Highlights:** Document invasive species distribution, User-friendly mapping system, Data submission and querying, Interactive maps, Expert data verification, Early Detection and Rapid Response support

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

**In-app purchases:** none


### Project Monarch Science

[App page](https://appshunter.io/ios/app/project-monarch-science/id6460006970)

This app transforms your smartphone into a receiver for tiny tracking devices attached to monarch butterflies. By crowdsourcing data, it helps scientists monitor butterfly migration patterns in unprecedented detail, aiding conservation efforts.

**Highlights:** Crowdsourced tracking network, Monarch butterfly migration monitoring, Detailed movement data, Habitat conservation insights, Utilizes Bluetooth frequency, Citizen science participation

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

**In-app purchases:** none


## Frequently asked questions

### Is EDDMapS free?

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

### Is Project Monarch Science free?

Project Monarch Science is free to download, with no in-app purchases.

### Which has better reviews, EDDMapS or Project Monarch Science?

EDDMapS is rated higher. EDDMapS averages 4.7 out of 5 from 120 ratings, while Project Monarch Science averages 3.7 from 18 ratings.

### Do EDDMapS or Project Monarch Science have ads?

Neither EDDMapS nor Project Monarch Science shows ads.

### Which is updated more often, EDDMapS or Project Monarch Science?

EDDMapS ships an update monthly, and Project Monarch Science weekly. Most recently, EDDMapS was updated on September 25, 2026 and Project Monarch Science on September 21, 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.*