# Project Monarch Science vs Modus Rover

The clearest difference is update cadence: Project Monarch Science at weekly against Modus Rover's every 3 weeks. On price, ads, in-app purchases and device support there is nothing between them.

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

Project Monarch Science ships an update weekly, Modus Rover every 3 weeks. The most recent releases landed on September 21, 2026 and September 14, 2026 respectively.

## The numbers

| Metric | Project Monarch Science | Modus Rover |
| --- | --- | --- |
| Price | Free | Free |
| Rating | **[3.7 (18 ratings)](https://appshunter.io/ios/app/project-monarch-science/id6460006970/reviews)** | — |
| Number of ratings | **18** | — |
| Positive reviews | 45.5% of reviews | — |
| In-app purchases | No | No |
| Ads | No | No |
| Update frequency | **Weekly** | Every 3 weeks |
| Monetization | Free | — |
| Size | 83 MB | 169 MB |
| Requires iOS | 15.0 | 15.0 |
| Devices | iPhone, iPad, iPod | iPhone, iPad, iPod |
| Age rating | 4+ | 4+ |
| Developer | [Cellular Tracking Technologies](https://appshunter.io/developer/1588087267) | [InTech Software Solutions Inc](https://appshunter.io/developer/1608959502) |

## What reviewers say

### 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


### Modus Rover

[App page](https://appshunter.io/ios/app/modus-rover/id6740578807)

**Features:** macOS Compatibility

**In-app purchases:** none


## Frequently asked questions

### Is Project Monarch Science free?

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

### Is Modus Rover free?

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

### Do Project Monarch Science or Modus Rover have ads?

Neither Project Monarch Science nor Modus Rover shows ads.

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

Project Monarch Science ships an update weekly, and Modus Rover every 3 weeks. Most recently, Project Monarch Science was updated on September 21, 2026 and Modus Rover on September 14, 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.*