# Project Monarch Science vs Mahjong Card Studio

The clearest difference is review sentiment: Mahjong Card Studio at 100% against Project Monarch Science's 60%. Mahjong Card Studio also leads on rating (4.3 vs 4.0) and update cadence (every 3 days vs every 10 days). Project Monarch Science's advantage is in-app purchases (none vs 3) and ratings volume (29 vs 6). On price, ads, device support and iOS requirement there is nothing between them.

Both are free to download. Mahjong Card Studio sells 3 in-app purchases, starting at $1.99 per month. Project Monarch Science asks for nothing beyond the download.

Mahjong Card Studio holds the better App Store score, 4.3 against 4.0. Both are backed by a comparable volume of ratings — 29 and 6 respectively. Written reviews point the same way: 60% of Project Monarch Science's written reviews are positive against 100% of Mahjong Card Studio's.

Project Monarch Science ships an update every 10 days, Mahjong Card Studio every 3 days. The most recent releases landed on November 3, 2026 and November 5, 2026 respectively.

## The numbers

| Metric | Project Monarch Science | Mahjong Card Studio |
| --- | --- | --- |
| Price | Free | Free |
| Rating | [4.0 (29 ratings)](https://appshunter.io/ios/app/project-monarch-science/id6460006970/reviews) | **[4.3 (6 ratings)](https://appshunter.io/ios/app/mahjong-card-studio/id6774391648/reviews)** |
| Number of ratings | **29** | 6 |
| Positive reviews | 60.0% of reviews | **100.0% of reviews** |
| In-app purchases | **No** | Yes |
| Ads | No | No |
| Update frequency | Every 10 days | **Every 3 days** |
| Monetization | **Free** | Freemium |
| Size | 83 MB | 86 MB |
| Requires iOS | **15.0** | 16.6 |
| Devices | **iPhone, iPad, iPod** | iPhone, iPad |
| Age rating | 4+ | 4+ |
| Developer | [Cellular Tracking Technologies](https://appshunter.io/developer/1588087267) | [Lores Logic LLC](https://appshunter.io/developer/1871755948) |

## 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


### Mahjong Card Studio

[App page](https://appshunter.io/ios/app/mahjong-card-studio/id6774391648)

Easily design and print custom American Mahjong cards for leagues, parties, or personal events. Choose from numerous holiday and life-milestone templates, personalize them with thematic elements, and export print-ready PDFs.

**Highlights:** Design custom American Mahjong cards, Print-ready PDF export, Holiday and life-milestone templates, Personalize with thematic elements, Trifold format for US Letter, Create 55-hand cards

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

**In-app purchases (3)**

| Purchase | Price | Billing |
| --- | --- | --- |
| Mahjong Card Studio Monthly | $1.99 | per month |
| Mahjong Card Studio Yearly | $5.99 | per year |
| Mahjong Card Studio Print | $0.99 | one-time |


## Frequently asked questions

### Is Project Monarch Science free?

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

### Is Mahjong Card Studio free?

Mahjong Card Studio is free to download, with in-app purchases available.

### Which has better reviews, Project Monarch Science or Mahjong Card Studio?

Mahjong Card Studio is rated higher. Project Monarch Science averages 4.0 out of 5 from 29 ratings, while Mahjong Card Studio averages 4.3 from 6 ratings.

### Do Project Monarch Science or Mahjong Card Studio have ads?

Neither Project Monarch Science nor Mahjong Card Studio shows ads.

### Which is updated more often, Project Monarch Science or Mahjong Card Studio?

Project Monarch Science ships an update every 10 days, and Mahjong Card Studio every 3 days. Most recently, Project Monarch Science was updated on November 3, 2026 and Mahjong Card Studio on November 5, 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.*