# CDC Yellow Book vs Travax

The clearest difference is rating: Travax at 5.0 against CDC Yellow Book's 4.2. Travax also leads on in-app purchases (none vs 2) and update cadence (every 3 weeks vs every 17 months). CDC Yellow Book's advantage is ratings volume (69 vs 5). On price, ads, device support and iOS requirement there is nothing between them.

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

Travax holds the better App Store score, 5.0 against 4.2. That said, the two scores are not equally well evidenced: CDC Yellow Book has 69 ratings behind it against 5, so its average is the more settled of the two.

CDC Yellow Book ships an update every 17 months, Travax every 3 weeks. The most recent releases landed on October 29, 2026 and October 7, 2026 respectively.

## The numbers

| Metric | CDC Yellow Book | Travax |
| --- | --- | --- |
| Price | Free | Free |
| Rating | [4.2 (69 ratings)](https://appshunter.io/ios/app/cdc-yellow-book/id1235766820/reviews) | **[5.0 (5 ratings)](https://appshunter.io/ios/app/travax/id6744760270/reviews)** |
| Number of ratings | **69** | 5 |
| Positive reviews | 20.0% of reviews | — |
| In-app purchases | Yes | **No** |
| Ads | No | No |
| Update frequency | Every 17 months | **Every 3 weeks** |
| Monetization | Free with in-app purchases | **Free** |
| Size | 10 MB | 50 MB |
| Requires iOS | **15.0** | 15.6 |
| Devices | iPhone, iPad, iPod | iPhone, iPad, iPod |
| Age rating | 17+ | 17+ |
| Developer | [Unbound Medicine, Inc.](https://appshunter.io/developer/300420400) | [Shoreland, Inc.](https://appshunter.io/developer/1809221463) |

## 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 |


### Travax

[App page](https://appshunter.io/ios/app/travax/id6744760270)

This app provides comprehensive travel medicine information, including destination-specific health risks, vaccine recommendations, and malaria prevention. It offers detailed country maps, cultural considerations, safety advice, and a library of over 100 travel health topics for research.

**Highlights:** Destination-specific medical summaries, Vaccine and malaria prevention recommendations, Traveler's diarrhea risk assessment, Searchable country maps, Cross-cultural and safety considerations, Extensive travel health library, Latest travel health bulletins

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

**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 Travax free?

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

### Which has better reviews, CDC Yellow Book or Travax?

Travax is rated higher. CDC Yellow Book averages 4.2 out of 5 from 69 ratings, while Travax averages 5.0 from 5 ratings.

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

Neither CDC Yellow Book nor Travax shows ads.

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

CDC Yellow Book ships an update every 17 months, and Travax every 3 weeks. Most recently, CDC Yellow Book was updated on October 29, 2026 and Travax on October 7, 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.*