# CDC Yellow Book vs ABOHNS

The clearest difference is in-app purchases: ABOHNS at none against CDC Yellow Book's 2. ABOHNS also leads on iOS requirement (9.3 vs 15.0). CDC Yellow Book's advantage is update cadence (every 17 months vs every 47 months) and device support (3 vs 1). On price and ads there is nothing between them.

Both are free to download. CDC Yellow Book sells 1 one-off in-app purchase. ABOHNS asks for nothing beyond the download.

CDC Yellow Book ships an update every 17 months, ABOHNS every 47 months. The most recent releases landed on November 2, 2026 and November 7, 2026 respectively.

## The numbers

| Metric | CDC Yellow Book | ABOHNS |
| --- | --- | --- |
| Price | Free | Free |
| Rating | **[4.2 (69 ratings)](https://appshunter.io/ios/app/cdc-yellow-book/id1235766820/reviews)** | — |
| Number of ratings | **69** | — |
| Positive reviews | 20.0% of reviews | — |
| In-app purchases | Yes | **No** |
| Ads | No | No |
| Update frequency | **Every 17 months** | Every 47 months |
| Monetization | Free with in-app purchases | — |
| Size | 10 MB | 5 MB |
| Requires iOS | 15.0 | **9.3** |
| Devices | **iPhone, iPad, iPod** | iPad |
| Age rating | 17+ | 17+ |
| Developer | [Unbound Medicine, Inc.](https://appshunter.io/developer/300420400) | [Internet Testing Systems (ITS)](https://appshunter.io/developer/546817214) |

## What reviewers say

### CDC Yellow Book

[App page](https://appshunter.io/ios/app/cdc-yellow-book/id1235766820)

Access the U.S. government's most current travel health guidelines, including vaccine recommendations and destination-specific advice. This app offers comprehensive information for staying healthy abroad, with features like search, notes, and favorites.

**Highlights:** Pre-travel vaccinations and preventative care, Destination-specific guidelines, Advice for travelers with specific health needs, Full text search, Custom notes and highlights, Reference maps, tables, and charts

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

**In-app purchases (1)**

| Purchase | Price | Billing |
| --- | --- | --- |
| CDC Yellow Book | $29.99 | one-time |


### ABOHNS

[App page](https://appshunter.io/ios/app/abohns-ote/id1550825622)

**In-app purchases:** none


## Frequently asked questions

### Is CDC Yellow Book free?

CDC Yellow Book is free to download, with in-app purchases available.

### Is ABOHNS free?

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

### Do CDC Yellow Book or ABOHNS have ads?

Neither CDC Yellow Book nor ABOHNS shows ads.

### Which is updated more often, CDC Yellow Book or ABOHNS?

CDC Yellow Book ships an update every 17 months, and ABOHNS every 47 months. Most recently, CDC Yellow Book was updated on November 2, 2026 and ABOHNS on November 7, 2026.

---

*Compared by [AppsHunter](https://appshunter.io/) from daily US App Store data. Review summaries are generated from verbatim App Store reviews.*