# Shell Shockers vs Mars 2501

The clearest difference is price: Mars 2501 at Free against Shell Shockers's $0.29. Mars 2501 also leads on update cadence (every 3 months vs every 33 months). Shell Shockers's advantage is in-app purchases (none vs 1) and iOS requirement (9.0 vs 15.0). On ads and device support there is nothing between them.

Mars 2501 is free to download; Shell Shockers costs $0.29 up front. Mars 2501 sells 1 one-off in-app purchase. Shell Shockers asks for nothing beyond the download.

Shell Shockers ships an update every 33 months, Mars 2501 every 3 months. The most recent releases landed on September 20, 2026 and July 25, 2026 respectively.

## The numbers

| Metric | Shell Shockers | Mars 2501 |
| --- | --- | --- |
| Price | $0.29 | **Free** |
| In-app purchases | **No** | Yes |
| Ads | No | No |
| Update frequency | Every 33 months | **Every 3 months** |
| Size | 25 MB | 111 MB |
| Requires iOS | **9.0** | 15.0 |
| Devices | iPhone, iPad, iPod | iPhone, iPad, iPod |
| Age rating | 4+ | 12+ |
| Developer | [Ranz Ursal](https://appshunter.io/developer/1116871834) | [Janek Soomets](https://appshunter.io/developer/1315295062) |

## What reviewers say

### Shell Shockers

[App page](https://appshunter.io/ios/app/shell-shockers/id1526050390)

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

**In-app purchases:** none


### Mars 2501

[App page](https://appshunter.io/ios/app/mars-2501/id6746960028)

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

**In-app purchases (1)**

| Purchase | Price | Billing |
| --- | --- | --- |
| Upgrade Mars 2501 | $4.99 | one-time |


## Frequently asked questions

### Is Shell Shockers free?

Shell Shockers costs $0.29, with no in-app purchases.

### Is Mars 2501 free?

Mars 2501 is free to download, with in-app purchases available.

### Do Shell Shockers or Mars 2501 have ads?

Neither Shell Shockers nor Mars 2501 shows ads.

### Which is updated more often, Shell Shockers or Mars 2501?

Shell Shockers ships an update every 33 months, and Mars 2501 every 3 months. Most recently, Shell Shockers was updated on September 20, 2026 and Mars 2501 on July 25, 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.*