Shellback vs Mount Prospect EMA
Price, ratings, monetisation and update history for both apps, side by side — with what reviewers say about each.
Shellback
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.
- 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
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What is the Shellback app? Shellback, formerly known as eDivo, is a free mobile app developed to support US Naval Surface Force (SURFOR) personnel in an easy-to-access offline environment. What is a Shellback? In naval tradition, a Shellback is a nickname for a Sailor who has crossed the Equator and thus transitioned from a novice Sailor, or Pollywog, to an experienced Sailor. Why do I need Shellback? Shellback provides Sailors the ability to download key SURFOR information on their own portable devices and access it while underway without the need for an internet connection. Shellback provides the most relevant and current information to SURFOR Sailors in one location. Content is scheduled for annual updates. What type of info can I find in Shellback? The information in Shellback is separated into several main categories: -Admin/Training: Contains the Correspondence Manual and the SURFOR Training and Readiness Manual. -Medical: Includes the Manual of the Medical Department, information on medical and physical readiness, mental health, Medical Evaluation Board procedures, the Disability Evaluation System, family member readiness, and more. -Operations: Includes information and training on bridge management, navigation basics, watch team tools, crew endurance, operating procedures for air-capable ships, Air Certification for Naval Surface Force Ships, and manuals for amphibs, maintenance, and other general ship operation resources. -Personnel Management: Provides documents on Navy personnel policy and administration. Also includes legal handbooks and manuals, resources for Surface Warfare Officers, and a variety of general personnel management resources. -Safety: Provides documents related to lessons learned, mishap reporting, notices, safety-related awards, and general safety resources. -Rules of the Road: This quiz tests a Sailor’s knowledge of maritime navigation rules.
Mount Prospect EMA
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This mobile app offers the residents of Mount Prospect, Illinois, emergency preparedness guidance and resources. Users can find useful PDFs, videos, and readiness checklists that will help them prepare for emergencies in their area. News, FAQs, contact information, and an alerts module are also provided.
Screenshots
Verdict
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.
Scored on Price · Rating · Positive reviews · Number of ratings · Update frequency · Ads · In-app purchases · Monetization · Best chart rank · Devices · Requires iOS
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.
| Parameter | Shellback | Mount Prospect EMA |
|---|---|---|
| Price | Free | Free |
| Rating | 3.2 (38 ratings) — better | — |
| Positive reviews | 45.2% of reviews | — |
| Number of ratings | 38 — better | — |
| Update frequency | Every 11 months | Every 3 months — better |
| Ads | No | No |
| In-app purchases | No | No |
| Monetization | Free | — |
| Devices | iPhone, iPad, iPod — better | iPhone, iPad |
| Requires iOS | 15.0 — better | 18.6 |
| Further details — not scored | ||
| Size | 89 MB | 55 MB |
| Age rating | 12+ | 4+ |
| Developer | Program Executive Office for Enterprise Information Systems, Sea Warrior Program | Village of Mount Prospect (IL) |
In-app purchases
Shellback
No in-app purchases
Mount Prospect EMA
No in-app purchases








