# COSI Science vs Hide & Keep

The clearest difference is in-app purchases: COSI Science at none against Hide & Keep's 3. COSI Science also leads on ratings volume (27 vs 5) and iOS requirement (11.0 vs 16.4). Hide & Keep's advantage is update cadence (weekly vs every 2 months). On price, rating, ads and device support there is nothing between them.

Both are free to download. Hide & Keep sells 3 one-off in-app purchases. COSI Science asks for nothing beyond the download.

On the App Store both sit at effectively the same score — 4.1 for COSI Science against 4.2 for Hide & Keep. That said, the two scores are not equally well evidenced: COSI Science has 27 ratings behind it against 5, so its average is the more settled of the two.

COSI Science ships an update every 2 months, Hide & Keep weekly. The most recent releases landed on October 12, 2026 and October 16, 2026 respectively.

## The numbers

| Metric | COSI Science | Hide & Keep |
| --- | --- | --- |
| Price | Free | Free |
| Rating | [4.1 (27 ratings)](https://appshunter.io/ios/app/cosi-science/id1251512700/reviews) | **[4.2 (5 ratings)](https://appshunter.io/ios/app/hide-and-keep/id6793730133/reviews)** |
| Number of ratings | **27** | 5 |
| Positive reviews | 64.3% of reviews | — |
| In-app purchases | **No** | Yes |
| Ads | No | No |
| Update frequency | Every 2 months | **Weekly** |
| Monetization | **Free** | Free with in-app purchases |
| Size | 21 MB | 45 MB |
| Requires iOS | **11.0** | 16.4 |
| Devices | **iPhone, iPad, iPod** | iPhone, iPad |
| Age rating | 4+ | 4+ |
| Developer | [COSI](https://appshunter.io/developer/1251512698) | [DAVONNE LEE](https://appshunter.io/developer/6793730136) |

## What reviewers say

### COSI Science

[App page](https://appshunter.io/ios/app/cosi-science/id1251512700)

Explore science at home with engaging videos and hands-on activities. Participate in citizen science projects or take virtual tours. This app brings the Center of Science and Industry's educational content to your family.

**Highlights:** At-home science discovery, Engaging science videos, Hands-on science activities, Citizen science participation, Virtual museum tours, Science challenges

**Features:** macOS Compatibility

**In-app purchases:** none


### Hide & Keep

[App page](https://appshunter.io/ios/app/hide-and-keep/id6793730133)

This interactive app guides children on a journey through Scripture to help them know, understand, and live God's Word. It features daily Bible study, memory videos, devotionals, and practical missions to build a lifelong relationship with Jesus.

**Highlights:** Interactive Bible memory videos, Daily Bible study (10-15 mins), Scripture reading and listening, Kid-friendly devotionals and reflection, Practical discipleship missions, Bible games and activities, Multiple student profiles

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

**In-app purchases (3)**

| Purchase | Price | Billing |
| --- | --- | --- |
| Exodus Base Camp | $9.99 | one-time |
| Exodus | $17.99 | one-time |
| Exodus (Book + Base Camp) | $24.99 | one-time |


## Frequently asked questions

### Is COSI Science free?

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

### Is Hide & Keep free?

Hide & Keep is free to download, with in-app purchases available.

### Which has better reviews, COSI Science or Hide & Keep?

Hide & Keep is rated higher. COSI Science averages 4.1 out of 5 from 27 ratings, while Hide & Keep averages 4.2 from 5 ratings.

### Do COSI Science or Hide & Keep have ads?

Neither COSI Science nor Hide & Keep shows ads.

### Which is updated more often, COSI Science or Hide & Keep?

COSI Science ships an update every 2 months, and Hide & Keep weekly. Most recently, COSI Science was updated on October 12, 2026 and Hide & Keep on October 16, 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.*