# MDU vs On

The clearest difference is review sentiment: On at 100% against MDU's 17%. On also leads on update cadence (weekly vs every 3 months). MDU's advantage is in-app purchases (none vs 1) and iOS requirement (12.2 vs 17.6). On price, ads, monetization model and device support there is nothing between them.

Both are free to download. On sells 1 one-off in-app purchase. MDU asks for nothing beyond the download.

MDU ships an update every 3 months, On weekly. The most recent releases landed on October 1, 2026 and October 8, 2026 respectively.

## The numbers

| Metric | MDU | On |
| --- | --- | --- |
| Price | Free | Free |
| Rating | **[4.0 (1 ratings)](https://appshunter.io/ios/app/mdu/id1335570470/reviews)** | — |
| Number of ratings | **1** | — |
| Positive reviews | 16.7% of reviews | **100.0% of reviews** |
| In-app purchases | **No** | Yes |
| Ads | No | No |
| Update frequency | Every 3 months | **Weekly** |
| Monetization | Free | Free |
| Size | 165 MB | 8 MB |
| Requires iOS | **12.2** | 17.6 |
| Devices | iPhone, iPad, iPod | iPhone, iPad, Apple Watch |
| Age rating | 4+ | 4+ |
| Developer | [The Medical Defence Union](https://appshunter.io/developer/1335570468) | [Mohsin Asad Sadiq](https://appshunter.io/developer/1896638622) |

## What reviewers say

### MDU

[App page](https://appshunter.io/ios/app/mdu/id1335570470)

Access expert medico-legal advice for medical professionals. Find guidance on patient confidentiality, prescribing, complaints, and more through articles, case studies, and quick guides. Tailor your feed and access membership details offline.

**Highlights:** Expert medico-legal advice, Quick guides and case studies, Searchable articles, Tailorable news feed, Offline reading, Membership card access

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

**In-app purchases:** none


### On

[App page](https://appshunter.io/ios/app/on-call/id6769200317)

Manage on-call shifts and track medical jobs efficiently. Prioritize workload, generate handover summaries instantly, and ensure data privacy with local storage. Designed by a doctor for fast, secure use during busy shifts.

**Highlights:** Track urgent and routine jobs, Prioritize workload, Generate structured handover summaries, Secure local data storage, Face ID protection, Fast and intuitive interface

**Features:** macOS Compatibility, Apple Watch app, Vision Pro support

**In-app purchases (1)**

| Purchase | Price | Billing |
| --- | --- | --- |
| Buy me a coffee | $2.99 | one-time |


## Frequently asked questions

### Is MDU free?

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

### Is On free?

On is free to download, with in-app purchases available.

### Do MDU or On have ads?

Neither MDU nor On shows ads.

### Which is updated more often, MDU or On?

MDU ships an update every 3 months, and On weekly. Most recently, MDU was updated on October 1, 2026 and On on October 8, 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.*