# Project Monarch Science vs RoadFixSTP

The clearest difference is device support: Project Monarch Science at 3 against RoadFixSTP's 1. Project Monarch Science also leads on iOS requirement (15.0 vs 17.0). 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.

Project Monarch Science ships an update every 9 days, RoadFixSTP every 11 days. The most recent releases landed on October 8, 2026 and October 10, 2026 respectively.

## The numbers

| Metric | Project Monarch Science | RoadFixSTP |
| --- | --- | --- |
| Price | Free | Free |
| Rating | **[4.0 (24 ratings)](https://appshunter.io/ios/app/project-monarch-science/id6460006970/reviews)** | — |
| Number of ratings | **24** | — |
| Positive reviews | 57.1% of reviews | — |
| In-app purchases | No | No |
| Ads | No | No |
| Update frequency | **Every 9 days** | Every 11 days |
| Monetization | Free | — |
| Size | 83 MB | 11 MB |
| Requires iOS | **15.0** | 17.0 |
| Devices | **iPhone, iPad, iPod** | iPhone |
| Age rating | 4+ | 4+ |
| Developer | [Cellular Tracking Technologies](https://appshunter.io/developer/1588087267) | [DB Tech LLC (MN)](https://appshunter.io/developer/1875759376) |

## 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


### RoadFixSTP

[App page](https://appshunter.io/ios/app/roadfixstp/id6764143445)

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

**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 RoadFixSTP free?

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

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

Neither Project Monarch Science nor RoadFixSTP shows ads.

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

Project Monarch Science ships an update every 9 days, and RoadFixSTP every 11 days. Most recently, Project Monarch Science was updated on October 8, 2026 and RoadFixSTP on October 10, 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.*