# EMS Guidebook vs ER NAV

EMS Guidebook and ER NAV both sit at 4.8 stars, but that hides the real split: 86% of ER NAV's written reviews are positive against 33% of EMS Guidebook's. EMS Guidebook's advantage is ratings volume (90 vs 14) and iOS requirement (15.0 vs 17.5). On price, rating, update cadence and ads there is nothing between them.

Both are free to download. EMS Guidebook sells 7 one-off in-app purchases and ER NAV sells 1 in-app purchase, starting at $2.99 per month. Whichever you choose, the download price is not the number that matters.

On the App Store both sit at effectively the same score — 4.8 for EMS Guidebook against 4.7 for ER NAV. That said, the two scores are not equally well evidenced: EMS Guidebook has 90 ratings behind it against 14, so its average is the more settled of the two. Written reviews are what separate them: 33% of EMS Guidebook's written reviews are positive against 86% of ER NAV's.

EMS Guidebook ships an update every 6 months, ER NAV every 3 months. The most recent releases landed on September 10, 2026 and September 20, 2026 respectively.

## The numbers

| Metric | EMS Guidebook | ER NAV |
| --- | --- | --- |
| Price | Free | Free |
| Rating | **[4.8 (90 ratings)](https://appshunter.io/ios/app/ems-guidebook/id527102213/reviews)** | [4.7 (14 ratings)](https://appshunter.io/ios/app/er-nav/id6751308029/reviews) |
| Number of ratings | **90** | 14 |
| Positive reviews | 33.3% of reviews | **85.7% of reviews** |
| In-app purchases | Yes | Yes |
| Ads | No | No |
| Update frequency | Every 6 months | **Every 3 months** |
| Monetization | Free with in-app purchases | Freemium |
| Size | 3 MB | 32 MB |
| Requires iOS | **15.0** | 17.5 |
| Devices | **iPhone, iPad, iPod** | iPhone, iPad |
| Age rating | 17+ | 4+ |
| Developer | [Larry Owens](https://appshunter.io/developer/496138296) | [DirectTo Solutions LLC](https://appshunter.io/developer/1834555580) |

## What reviewers say

### EMS Guidebook

[App page](https://appshunter.io/ios/app/ems-guidebook/id527102213)

This app provides a digital reference for emergency medical service protocols, replacing traditional physical guidebooks. It includes essential medical charts, guidelines, and rhythm examples, with agency-specific protocols accessible via password.

**Highlights:** Digital EMS agency protocols, Replacement for physical guidebooks, Pediatric vital signs charts, Burn and c-spine clearance guides, Cardiac rhythm examples, AHA guidelines

**Features:** macOS Compatibility

**In-app purchases (7)**

| Purchase | Price | Billing |
| --- | --- | --- |
| 2009 Utah EMS for Children Off-Line Protocols | $1.99 | one-time |
| District 2B Protocols | $2.99 | one-time |
| 2009 West Virginia EMT Basic Protocols | $3.99 | one-time |
| 2012 North Carolina EMS Protocols | $4.99 | one-time |
| 2009 North Carolina EMS Protocols | $4.99 | one-time |
| 2010 Hawaii EMS Standing Orders | $4.99 | one-time |
| 2011-2013 St John New Zealand Protocols | $4.99 | one-time |


### ER NAV

[App page](https://appshunter.io/ios/app/er-nav/id6751308029)

This app provides EMS professionals with direct navigation to ambulance bays and critical hospital information. It offers features like specialty filtering, user-submitted bay images, and integrated medical references. Users can also access protocols, drug information, and a unique O2 tank calculator.

**Highlights:** Direct ambulance bay navigation, Hospital specialty designations, User-submitted bay images, Integrated medical references, NJ EMS protocol access, O2 tank duration calculator, Real-time traffic flow

**In-app purchases (1)**

| Purchase | Price | Billing |
| --- | --- | --- |
| All Access | $2.99 | per month |


## Frequently asked questions

### Is EMS Guidebook free?

EMS Guidebook is free to download, with in-app purchases available.

### Is ER NAV free?

ER NAV is free to download, with in-app purchases available.

### Which has better reviews, EMS Guidebook or ER NAV?

EMS Guidebook is rated higher. EMS Guidebook averages 4.8 out of 5 from 90 ratings, while ER NAV averages 4.7 from 14 ratings.

### Do EMS Guidebook or ER NAV have ads?

Neither EMS Guidebook nor ER NAV shows ads.

### Which is updated more often, EMS Guidebook or ER NAV?

EMS Guidebook ships an update every 6 months, and ER NAV every 3 months. Most recently, EMS Guidebook was updated on September 10, 2026 and ER NAV on September 20, 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.*