# Callyope vs Concise Infectious Diseases

The clearest difference is in-app purchases: Callyope at none against Concise Infectious Diseases's 4. On price, ads, device support and iOS requirement there is nothing between them.

Both are free to download. Concise Infectious Diseases sells 4 in-app purchases, starting at $2.99 per month. Callyope asks for nothing beyond the download.

## The numbers

| Metric | Callyope | Concise Infectious Diseases |
| --- | --- | --- |
| Price | Free | Free |
| In-app purchases | **No** | Yes |
| Ads | No | No |
| Update frequency | Every 2 months | — |
| Size | 61 MB | 48 MB |
| Requires iOS | **15.0** | 16.0 |
| Devices | iPhone, iPod | iPhone, iPad |
| Age rating | 17+ | 17+ |
| Developer | [Callyope](https://appshunter.io/developer/1682862643) | [RER MedApps](https://appshunter.io/developer/1720150558) |

## What reviewers say

### Callyope

[App page](https://appshunter.io/ios/app/callyope/id6751595446)

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

**In-app purchases:** none


### Concise Infectious Diseases

[App page](https://appshunter.io/ios/app/concise-infectious-diseases/id6757497364)

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

**In-app purchases (4)**

| Purchase | Price | Billing |
| --- | --- | --- |
| Premium Monthly | $2.99 | per month |
| Premium Yearly | $24.99 | per year |
| Lifetime Access - 50% Off | $24.99 | one-time |
| Lifetime Access | $49.99 | one-time |


## Frequently asked questions

### Is Callyope free?

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

### Is Concise Infectious Diseases free?

Concise Infectious Diseases is free to download, with in-app purchases available.

### Do Callyope or Concise Infectious Diseases have ads?

Neither Callyope nor Concise Infectious Diseases shows ads.

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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.*