# CDC vs ReadyVax

The clearest difference is review sentiment: ReadyVax at 75% against CDC's 22%. ReadyVax also leads on rating (4.4 vs 2.9). CDC's advantage is update cadence (monthly vs every 25 months) and ratings volume (413 vs 7). On price, ads, in-app purchases and monetization model there is nothing between them.

Both are free to download. Neither carries in-app purchases, so what you see is what you pay.

ReadyVax holds the better App Store score, 4.4 against 2.9. That said, the two scores are not equally well evidenced: CDC has 413 ratings behind it against 7, so its average is the more settled of the two. Written reviews point the same way: 22% of CDC's written reviews are positive against 75% of ReadyVax's.

CDC ships an update monthly, ReadyVax every 25 months. The most recent releases landed on September 15, 2026 and September 14, 2026 respectively.

## The numbers

| Metric | CDC | ReadyVax |
| --- | --- | --- |
| Price | Free | Free |
| Rating | [2.9 (413 ratings)](https://appshunter.io/ios/app/cdc/id487847188/reviews) | **[4.4 (7 ratings)](https://appshunter.io/ios/app/readyvax/id957851259/reviews)** |
| Number of ratings | **413** | 7 |
| Positive reviews | 22.5% of reviews | **75.0% of reviews** |
| In-app purchases | No | No |
| Ads | No | No |
| Update frequency | **Monthly** | Every 25 months |
| Monetization | Free | Free |
| Size | 38 MB | 19 MB |
| Requires iOS | 15.6 | **14.0** |
| Devices | **iPhone, iPad, iPod** | iPhone, iPod |
| Age rating | 12+ | 17+ |
| Developer | [Centers For Disease Control and Prevention](https://appshunter.io/developer/439259253) | [Emory University](https://appshunter.io/developer/387102326) |

## What reviewers say

### CDC

[App page](https://appshunter.io/ios/app/cdc/id487847188)

Access the latest health information and news directly from the official source. Organize your home screen to prioritize what matters most and receive real-time updates. Explore a variety of content including disease data, videos, podcasts, and journal articles.

**Highlights:** Up-to-date health information, Customizable home screen, Disease case counts, Videos and podcasts, Journal articles, Searchable web content

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

**In-app purchases:** none

**What reviewers like**

- 💡 Informative and reliable health information
- 🚀 Easy to navigate and access data
- 👍 Useful for public health professionals and students

**What reviewers complain about**

- 🐛 Frequent crashes and bugs
- ⚠️ Outdated or inaccurate information, especially regarding COVID-19
- 🔒 Privacy and security concerns
- 👎 Lack of trust in the CDC due to political influence

**Reported bugs**

- Links within articles not working
- App freezing or not loading past the splash screen
- Symptom checker and other features not functioning properly

**Requested features**

- Improved contact tracing tools
- More up-to-date and comprehensive disease data
- Better integration with other health apps and platforms
- Landscape mode support for tablets


### ReadyVax

[App page](https://appshunter.io/ios/app/readyvax/id957851259)

Provides up-to-date, evidence-based information on vaccines and vaccination schedules. Designed for both healthcare professionals and general users, it offers customizable data views and real-time alerts for important updates.

**Highlights:** Up-to-date vaccine recommendations, Vaccine safety profiles, Disease prevention information, Real-time alerts and updates, Customizable data presentation, Offline access to information

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

**In-app purchases:** none


## Frequently asked questions

### Is CDC free?

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

### Is ReadyVax free?

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

### Which has better reviews, CDC or ReadyVax?

ReadyVax is rated higher. CDC averages 2.9 out of 5 from 413 ratings, while ReadyVax averages 4.4 from 7 ratings.

### Do CDC or ReadyVax have ads?

Neither CDC nor ReadyVax shows ads.

### Which is updated more often, CDC or ReadyVax?

CDC ships an update monthly, and ReadyVax every 25 months. Most recently, CDC was updated on September 15, 2026 and ReadyVax on September 14, 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.*