# Shellback vs Mount Prospect EMA

The clearest difference is update cadence: Mount Prospect EMA at every 3 months against Shellback's every 11 months. Shellback's advantage is iOS requirement (15.0 vs 18.6). On price, ads, in-app purchases and device support there is nothing between them.

Both are free to download. Neither carries in-app purchases, so what you see is what you pay.

Shellback ships an update every 11 months, Mount Prospect EMA every 3 months. Both last shipped on October 4, 2026.

## The numbers

| Metric | Shellback | Mount Prospect EMA |
| --- | --- | --- |
| Price | Free | Free |
| Rating | **[3.2 (38 ratings)](https://appshunter.io/ios/app/shellback/id955157952/reviews)** | — |
| Number of ratings | **38** | — |
| Positive reviews | 45.2% of reviews | — |
| In-app purchases | No | No |
| Ads | No | No |
| Update frequency | Every 11 months | **Every 3 months** |
| Monetization | Free | — |
| Size | 89 MB | 55 MB |
| Requires iOS | **15.0** | 18.6 |
| Devices | **iPhone, iPad, iPod** | iPhone, iPad |
| Age rating | 12+ | 4+ |
| Developer | [Program Executive Office for Enterprise Information Systems, Sea Warrior Program](https://appshunter.io/developer/1477503418) | [Village of Mount Prospect (IL)](https://appshunter.io/developer/1689442757) |

## What reviewers say

### Shellback

[App page](https://appshunter.io/ios/app/shellback/id955157952)

This app provides US Naval Surface Force personnel with offline access to essential information. It includes manuals and resources for administration, medical, operations, personnel management, safety, and navigation rules. Content is updated annually for relevance.

**Highlights:** Offline access to SURFOR information, Admin/Training manuals, Medical readiness resources, Operations and navigation training, Personnel management documents, Safety information and lessons learned, Rules of the Road quiz

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

**In-app purchases:** none


### Mount Prospect EMA

[App page](https://appshunter.io/ios/app/mount-prospect-ema/id6449500912)

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

**In-app purchases:** none


## Frequently asked questions

### Is Shellback free?

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

### Is Mount Prospect EMA free?

Mount Prospect EMA is free to download, with no in-app purchases.

### Do Shellback or Mount Prospect EMA have ads?

Neither Shellback nor Mount Prospect EMA shows ads.

### Which is updated more often, Shellback or Mount Prospect EMA?

Shellback ships an update every 11 months, and Mount Prospect EMA every 3 months. Most recently, Shellback was updated on October 4, 2026 and Mount Prospect EMA on October 4, 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.*