# Twin Science vs STEM Discovery Campaign

The clearest difference is rating: STEM Discovery Campaign at 5.0 against Twin Science's 4.4. STEM Discovery Campaign also leads on in-app purchases (none vs 10) and iOS requirement (11.0 vs 15.0). Twin Science's advantage is ratings volume (77 vs 1). On price, update cadence, ads and device support there is nothing between them.

Both are free to download. Twin Science sells 10 in-app purchases, starting at $2.49 per month. STEM Discovery Campaign asks for nothing beyond the download.

STEM Discovery Campaign holds the better App Store score, 5.0 against 4.4. That said, the two scores are not equally well evidenced: Twin Science has 77 ratings behind it against 1, so its average is the more settled of the two.

Twin Science ships an update every 2 months, STEM Discovery Campaign every 6 weeks. The most recent releases landed on October 25, 2026 and October 9, 2026 respectively.

## The numbers

| Metric | Twin Science | STEM Discovery Campaign |
| --- | --- | --- |
| Price | Free | Free |
| Rating | [4.4 (77 ratings)](https://appshunter.io/ios/app/twin-science-stem-learning/id1479559635/reviews) | **[5.0 (1 ratings)](https://appshunter.io/ios/app/stem-discovery-campaign/id1668152623/reviews)** |
| Number of ratings | **77** | 1 |
| Positive reviews | 57.1% of reviews | — |
| In-app purchases | Yes | **No** |
| Ads | No | No |
| Update frequency | Every 2 months | **Every 6 weeks** |
| Monetization | Free with in-app purchases | **Free** |
| Size | 93 MB | 39 MB |
| Requires iOS | 15.0 | **11.0** |
| Devices | iPhone, iPad, iPod | iPhone, iPad, iPod |
| Age rating | 4+ | 4+ |
| Developer | [Twin](https://appshunter.io/developer/1447423866) | [EUN Partnership AISBL](https://appshunter.io/developer/1293134978) |

## What reviewers say

### Twin Science

[App page](https://appshunter.io/ios/app/twin-science-stem-learning/id1479559635)

This app provides sustainability and environmental education for children aged 7-12 through gamified STEM+A content. It features interactive videos, hands-on projects, trivia, and AI-based skill reports for parents and educators.

**Highlights:** SDG-based sustainability content, Gamified learning experience, AI-based monthly skill reports, Interactive discovery videos, Hands-on DIY projects, STEM+A trivia games, Ad-free and moderated environment

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

**In-app purchases (10)**

| Purchase | Price | Billing |
| --- | --- | --- |
| Premium Membership | $2.49 | per month |
| Premium Membership | $2.99 | per month |
| Premium Membership | $3.49 | per month |
| Monthly Premium Plan | $7.99 | per month |
| Premium Membership | $23.99 | per year |
| Premium Membership | $27.99 | per year |
| Premium Membership | $29.99 | per year |
| 6 Months Education Pack | $44.99 | per 6 months |
| Yearly Premium Plan | $79.99 | per year |
| 1 Year Education Pack | $79.99 | per year |


### STEM Discovery Campaign

[App page](https://appshunter.io/ios/app/stem-discovery-campaign/id1668152623)

Explore and submit STEM activities worldwide on an interactive map. Discover partner projects, learn about different STEM events, and filter entries to find what interests you. Participate in exciting competitions and win awards.

**Highlights:** Browse STEM activities on a map, Submit your own STEM activities, View partner projects, Discover diverse STEM events, Filter map and feed entries, Participate in competitions

**Features:** macOS Compatibility

**In-app purchases:** none


## Frequently asked questions

### Is Twin Science free?

Twin Science is free to download, with in-app purchases available.

### Is STEM Discovery Campaign free?

STEM Discovery Campaign is free to download, with no in-app purchases.

### Which has better reviews, Twin Science or STEM Discovery Campaign?

STEM Discovery Campaign is rated higher. Twin Science averages 4.4 out of 5 from 77 ratings, while STEM Discovery Campaign averages 5.0 from 1 ratings.

### Do Twin Science or STEM Discovery Campaign have ads?

Neither Twin Science nor STEM Discovery Campaign shows ads.

### Which is updated more often, Twin Science or STEM Discovery Campaign?

Twin Science ships an update every 2 months, and STEM Discovery Campaign every 6 weeks. Most recently, Twin Science was updated on October 25, 2026 and STEM Discovery Campaign on October 9, 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.*