# Drug Interactions vs COSA

The clearest difference is price: COSA at Free against Drug Interactions's $7.99. COSA also leads on iOS requirement (11.0 vs 16.0). Drug Interactions's advantage is ads (none vs shown). On update cadence, in-app purchases and device support there is nothing between them.

COSA is free to download; Drug Interactions costs $7.99 up front. Neither carries in-app purchases, so what you see is what you pay.

Both ship on a similar rhythm, roughly every 3 months. The most recent releases landed on November 6, 2026 and November 3, 2026 respectively.

## The numbers

| Metric | Drug Interactions | COSA |
| --- | --- | --- |
| Price | $7.99 | **Free** |
| Rating | — | **[3.7 (3 ratings)](https://appshunter.io/ios/app/cosa-medication-information/id1626158440/reviews)** |
| Number of ratings | — | **3** |
| In-app purchases | No | No |
| Ads | **No** | Yes |
| Update frequency | Every 3 months | Every 3 months |
| Monetization | — | Ad-supported |
| Size | 1 MB | 28 MB |
| Requires iOS | 16.0 | **11.0** |
| Devices | iPhone, iPad | iPhone, iPod |
| Age rating | +17 | 4+ |
| Developer | [Pierre Chaillet](https://appshunter.io/developer/481949152) | [MEDICAL EDUCATION RESOURCES, LLC](https://appshunter.io/developer/1561046509) |

## What reviewers say

### Drug Interactions

[App page](https://appshunter.io/ios/app/drug-interactions/id483813178)

**Features:** Vision Pro support

**In-app purchases:** none


### COSA

[App page](https://appshunter.io/ios/app/cosa-medication-information/id1626158440)

Access essential drug information and advanced patient resources. This app provides a portion of licensed drug data from a leading healthcare information provider, based on industry-standard databases.

**Highlights:** Essential drug information, Advanced patient resources, Licensed drug data, Industry-standard databases, Physician-focused resources

**Features:** macOS Compatibility

**In-app purchases:** none


## Frequently asked questions

### Is Drug Interactions free?

Drug Interactions costs $7.99, with no in-app purchases.

### Is COSA free?

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

### Do Drug Interactions or COSA have ads?

COSA shows ads; Drug Interactions does not.

### Which is updated more often, Drug Interactions or COSA?

Drug Interactions ships an update every 3 months, and COSA every 3 months. Most recently, Drug Interactions was updated on November 6, 2026 and COSA on November 3, 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.*