# DDU vs Perio Brain

The clearest difference is review sentiment: DDU at 100% against Perio Brain's 92%. On price, update cadence, ads and in-app purchases there is nothing between them.

Both are free to download. 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 September 13, 2026 and September 22, 2026 respectively.

## The numbers

| Metric | DDU | Perio Brain |
| --- | --- | --- |
| Price | Free | Free |
| Rating | — | **[4.9 (35 ratings)](https://appshunter.io/ios/app/perio-brain/id1567282977/reviews)** |
| Number of ratings | — | **35** |
| Positive reviews | **100.0% of reviews** | 91.7% of reviews |
| In-app purchases | No | No |
| Ads | No | No |
| Update frequency | Every 3 months | Every 3 months |
| Monetization | Free | Free |
| Size | 165 MB | 50 MB |
| Requires iOS | 12.2 | **12.0** |
| Devices | iPhone, iPad, iPod | iPhone, iPad, iPod |
| Age rating | 4+ | 17+ |
| Developer | [The Medical Defence Union](https://appshunter.io/developer/1335570468) | [SHO Me Digital Ltd](https://appshunter.io/developer/1537565630) |

## What reviewers say

### DDU

[App page](https://appshunter.io/ios/app/ddu/id1335607491)

Access expert dento-legal advice for dental professionals. Find guidance on patient confidentiality, consent, complaints, and more through articles, case studies, and quick guides. Customize your feed and read offline.

**Highlights:** Expert dento-legal advice, Patient confidentiality guidance, Consent and communication advice, Response to patient complaints, Quick guides and case studies, Offline reading capability, Customizable news feed

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

**In-app purchases:** none


### Perio Brain

[App page](https://appshunter.io/ios/app/perio-brain/id1567282977)

This app assists dental professionals in classifying periodontal disease using assessment values. It helps dentists and students formulate quicker diagnoses and treatment plans based on current guidance.

**Highlights:** Periodontitis diagnosis formulation, Periodontal disease classification, Evidence-based diagnostic tool, Treatment planning assistance, Utilizes latest published guidance

**Features:** Vision Pro support

**In-app purchases:** none


## Frequently asked questions

### Is DDU free?

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

### Is Perio Brain free?

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

### Do DDU or Perio Brain have ads?

Neither DDU nor Perio Brain shows ads.

### Which is updated more often, DDU or Perio Brain?

DDU ships an update every 3 months, and Perio Brain every 3 months. Most recently, DDU was updated on September 13, 2026 and Perio Brain on September 22, 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.*