# What Doctors Know vs Densol

The clearest difference is in-app purchases: Densol at none against What Doctors Know's 14. Densol also leads on update cadence (daily vs every 4 months). On price, ads, device support and iOS requirement there is nothing between them.

Both are free to download. What Doctors Know sells 14 in-app purchases, starting at $5.99 per year. Densol asks for nothing beyond the download.

What Doctors Know ships an update every 4 months, Densol daily. The most recent releases landed on October 6, 2026 and October 4, 2026 respectively.

## The numbers

| Metric | What Doctors Know | Densol |
| --- | --- | --- |
| Price | Free | Free |
| In-app purchases | Yes | **No** |
| Ads | No | No |
| Update frequency | Every 4 months | **Daily** |
| Size | 12 MB | 62 MB |
| Requires iOS | 13.0 | **12.0** |
| Devices | iPhone, iPad, iPod | iPhone, iPad, iPod |
| Age rating | 17+ | 4+ |
| Developer | [PressPad Sp. z o.o.](https://appshunter.io/developer/449000752) | [Medmyer Pty Ltd](https://appshunter.io/developer/1696068318) |

## What reviewers say

### What Doctors Know

[App page](https://appshunter.io/ios/app/what-doctors-know/id880982965)

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

**In-app purchases (14)**

| Purchase | Price | Billing |
| --- | --- | --- |
| What Doctors Know | $5.99 | per year |
| Issue #1 | $0.99 | one-time |
| Issue #2 | $0.99 | one-time |
| Issue #3 | $0.99 | one-time |
| Issue #95 | $0.99 | one-time |
| Issue #96 | $0.99 | one-time |
| Issue #97 | $0.99 | one-time |
| Issue #98 | $0.99 | one-time |
| Issue #99 | $0.99 | one-time |
| Issue #100 | $0.99 | one-time |
| Issue #91 | $0.99 | one-time |
| Issue #92 | $0.99 | one-time |
| Issue #93 | $0.99 | one-time |
| Issue #94 | $0.99 | one-time |


### Densol

[App page](https://appshunter.io/ios/app/densol/id6740196578)

**Features:** macOS Compatibility

**In-app purchases:** none


## Frequently asked questions

### Is What Doctors Know free?

What Doctors Know is free to download, with in-app purchases available.

### Is Densol free?

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

### Do What Doctors Know or Densol have ads?

Neither What Doctors Know nor Densol shows ads.

### Which is updated more often, What Doctors Know or Densol?

What Doctors Know ships an update every 4 months, and Densol daily. Most recently, What Doctors Know was updated on October 6, 2026 and Densol on October 4, 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.*