NFAAS vs Shellback
Price, ratings, monetisation and update history for both apps, side by side — with what reviewers say about each.
NFAAS
This app provides emergency preparedness information for Navy personnel and their families. It helps users report their status, update contact details, manage contacts, and access checklists for disaster readiness. It also offers navigation to Navy installations and educational resources for before, during, and after emergencies.
- Emergency preparedness information
- Report accounting status
- Update contact and location
- Manage personal contacts
- Emergency preparation checklists
- Find nearby Navy installations
- Disaster readiness guidance
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The Navy Family Accountability and Assessment System (NFAAS) app brings together all the emergency preparedness information Sailors and their family members will need to prepare for and survive an emergency or disaster. It standardizes a method for the Navy to account for, assess, manage, and monitor the recovery process of those affected by a widespread catastrophic event. NFAAS also provides valuable information to all levels of Navy leadership, allowing commanders to make strategic decisions that facilitate a return to stability. Get up-to-date information on emergency preparedness, local weather and other local emergency situations with notifications and alerts. The NFAAS app allows users to: • Report accounting status • Update contact/location information • Manage your personal contacts • Use checklists to help prepare for an emergency • Use GPS and get turn-by-turn directions to the closest Navy installation • Learn what to do before, during and after an emergency or disaster • Watch videos showing you how to update your NFAAS information and why For more information on NFAAS, visit https://navyfamily.navy.mil.
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.
Screenshots
Verdict
The clearest difference is review sentiment: Shellback at 45% against NFAAS's 2%. Shellback also leads on rating (3.2 vs 1.5). NFAAS's advantage is ratings volume (193 vs 38) and iOS requirement (9.0 vs 15.0). On price, update cadence, ads and in-app purchases 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 holds the better App Store score, 3.2 against 1.5. That said, the two scores are not equally well evidenced: NFAAS has 193 ratings behind it against 38, so its average is the more settled of the two. Written reviews point the same way: 2% of NFAAS's written reviews are positive against 45% of Shellback's.
NFAAS ships an update every 8 months, Shellback every 10 months. Both last shipped on June 9, 2026.
| Parameter | NFAAS | Shellback |
|---|---|---|
| Price | Free | Free |
| Rating | 1.5 (193 ratings) | 3.2 (38 ratings) — better |
| Positive reviews | 1.7% of reviews | 45.2% of reviews — better |
| Number of ratings | 193 — better | 38 |
| Update frequency | Every 8 months — better | Every 10 months |
| Ads | No | No |
| In-app purchases | No | No |
| Monetization | Free | Free |
| Devices | iPhone, iPod | iPhone, iPad, iPod — better |
| Requires iOS | 9.0 — better | 15.0 |
| Further details — not scored | ||
| Size | 23 MB | 71 MB |
| Age rating | 4+ | 12+ |
| Developer | CNIC HQ | Program Executive Office for Enterprise Information Systems, Sea Warrior Program |
Customer experience
NFAAS
Shellback
In-app purchases
NFAAS
No in-app purchases
Shellback
No in-app purchases







