# Project Monarch Science vs CheckOut Master

The clearest difference is price: Project Monarch Science at Free against CheckOut Master's $1.00. Project Monarch Science also leads on ratings volume (29 vs 1) and iOS requirement (15.0 vs 18.0). CheckOut Master's advantage is rating (5.0 vs 4.0) and 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; CheckOut Master costs $1.00 up front. Neither carries in-app purchases, so what you see is what you pay.

CheckOut Master holds the better App Store score, 5.0 against 4.0. That said, the two scores are not equally well evidenced: Project Monarch Science has 29 ratings behind it against 1, so its average is the more settled of the two.

Project Monarch Science ships an update every 10 days, CheckOut Master every 2 days. The most recent releases landed on November 3, 2026 and October 30, 2026 respectively.

## The numbers

| Metric | Project Monarch Science | CheckOut Master |
| --- | --- | --- |
| Price | **Free** | $1.00 |
| Rating | [4.0 (29 ratings)](https://appshunter.io/ios/app/project-monarch-science/id6460006970/reviews) | **[5.0 (1 ratings)](https://appshunter.io/ios/app/checkout-master/id6748267777/reviews)** |
| Number of ratings | **29** | 1 |
| Positive reviews | 60.0% of reviews | — |
| In-app purchases | No | No |
| Ads | No | No |
| Update frequency | Every 10 days | **Every 2 days** |
| Monetization | **Free** | Paid |
| Size | 83 MB | 1 MB |
| Requires iOS | **15.0** | 18.0 |
| Devices | **iPhone, iPad, iPod** | iPhone, iPad |
| Age rating | 4+ | 4+ |
| Developer | [Cellular Tracking Technologies](https://appshunter.io/developer/1588087267) | [Michael Rosenblatt](https://appshunter.io/developer/1716144701) |

## 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


### CheckOut Master

[App page](https://appshunter.io/ios/app/checkout-master/id6748267777)

Easily manage and track important equipment, especially in educational settings. This application simplifies the checkout process for shared resources.

**Highlights:** Equipment checkout tracking, Classroom equipment management, Easy-to-use interface, Designed for educational settings

**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 CheckOut Master free?

CheckOut Master costs $1.00, with no in-app purchases.

### Which has better reviews, Project Monarch Science or CheckOut Master?

CheckOut Master is rated higher. Project Monarch Science averages 4.0 out of 5 from 29 ratings, while CheckOut Master averages 5.0 from 1 ratings.

### Do Project Monarch Science or CheckOut Master have ads?

Neither Project Monarch Science nor CheckOut Master shows ads.

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

Project Monarch Science ships an update every 10 days, and CheckOut Master every 2 days. Most recently, Project Monarch Science was updated on November 3, 2026 and CheckOut Master on October 30, 2026.

---

*Compared by [AppsHunter](https://appshunter.io/) from daily US App Store data. Review summaries are generated from verbatim App Store reviews.*