# Project Monarch Science vs Stolpersteine.app

The clearest difference is device support: Project Monarch Science at 3 against Stolpersteine.app's —. Stolpersteine.app's advantage is iOS requirement (12.0 vs 15.0). On price 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.

## The numbers

| Metric | Project Monarch Science | Stolpersteine.app |
| --- | --- | --- |
| 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 | — |
| Update frequency | Every 9 days | — |
| Monetization | Free | — |
| Size | 83 MB | 52 MB |
| Requires iOS | 15.0 | **12.0** |
| Devices | **iPhone, iPad, iPod** | — |
| Age rating | 4+ | 17+ |
| Developer | [Cellular Tracking Technologies](https://appshunter.io/developer/1588087267) | [Stichting 18 september](https://appshunter.io/developer/1446652529) |

## 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


### Stolpersteine.app

[App page](https://appshunter.io/ios/app/stolpersteineapp/id6502823968)

**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 Stolpersteine.app free?

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

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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.*