# Project Monarch Science vs SoulTuner

The clearest difference is price: Project Monarch Science at Free against SoulTuner's $0.99. Project Monarch Science also leads on iOS requirement (15.0 vs 18.6). SoulTuner's advantage is update cadence (every 2 days vs every 10 days). On ads, in-app purchases and device support there is nothing between them.

Project Monarch Science is free to download; SoulTuner costs $0.99 up front. Neither carries in-app purchases, so what you see is what you pay.

Project Monarch Science ships an update every 10 days, SoulTuner every 2 days. The most recent releases landed on November 3, 2026 and November 6, 2026 respectively.

## The numbers

| Metric | Project Monarch Science | SoulTuner |
| --- | --- | --- |
| Price | **Free** | $0.99 |
| Rating | **[4.0 (29 ratings)](https://appshunter.io/ios/app/project-monarch-science/id6460006970/reviews)** | — |
| Number of ratings | **29** | — |
| Positive reviews | 60.0% of reviews | — |
| In-app purchases | No | No |
| Ads | No | No |
| Update frequency | Every 10 days | **Every 2 days** |
| Monetization | Free | — |
| Size | 83 MB | 4 MB |
| Requires iOS | **15.0** | 18.6 |
| Devices | **iPhone, iPad, iPod** | iPhone, iPad |
| Age rating | 4+ | 4+ |
| Developer | [Cellular Tracking Technologies](https://appshunter.io/developer/1588087267) | [Techné Media](https://appshunter.io/developer/486076968) |

## 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


### SoulTuner

[App page](https://appshunter.io/ios/app/soultuner/id6820549671)

**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 SoulTuner free?

SoulTuner costs $0.99, with no in-app purchases.

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

Neither Project Monarch Science nor SoulTuner shows ads.

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

Project Monarch Science ships an update every 10 days, and SoulTuner every 2 days. Most recently, Project Monarch Science was updated on November 3, 2026 and SoulTuner on November 6, 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.*