# My DIA vs MSD One

The clearest difference is update cadence: My DIA at weekly against MSD One's every 6 months. My DIA also leads on ratings volume (97 vs 7). MSD One's advantage is monetization model (free vs ad-supported). On price, rating, review sentiment and ads there is nothing between them.

Both are free to download. Neither carries in-app purchases, so what you see is what you pay.

On the App Store both sit at effectively the same score — 4.4 for My DIA against 4.4 for MSD One. That said, the two scores are not equally well evidenced: My DIA has 97 ratings behind it against 7, so its average is the more settled of the two. Written reviews split almost evenly too, at 0% and 0% positive.

My DIA ships an update weekly, MSD One every 6 months. The most recent releases landed on September 17, 2026 and September 27, 2026 respectively.

## The numbers

| Metric | My DIA | MSD One |
| --- | --- | --- |
| Price | Free | Free |
| Rating | [4.4 (97 ratings)](https://appshunter.io/ios/app/my-dia/id1608219630/reviews) | [4.4 (7 ratings)](https://appshunter.io/ios/app/msd-one/id6474043630/reviews) |
| Number of ratings | **97** | 7 |
| Positive reviews | 0.0% of reviews | 0.0% of reviews |
| In-app purchases | No | No |
| Ads | No | No |
| Update frequency | **Weekly** | Every 6 months |
| Monetization | Ad-supported | **Free** |
| Size | 143 MB | 122 MB |
| Requires iOS | 17.4 | **16.4** |
| Devices | iPhone | **iPhone, iPad** |
| Age rating | 17+ | 17+ |
| Developer | [Drug Information Association, Inc.](https://appshunter.io/developer/1444802071) | [Merck Sharp & Dohme LLC](https://appshunter.io/developer/718617686) |

## What reviewers say

### My DIA

[App page](https://appshunter.io/ios/app/my-dia/id1608219630)

Connect with peers and experts in the life sciences field to discuss global and local challenges. Access information on upcoming activities, manage registered events, and schedule meetings to foster collaboration for better policies and patient outcomes.

**Highlights:** Global community networking, Event access and management, Peer and expert connection, Meeting scheduling, Life sciences challenge discussion

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

**In-app purchases:** none


### MSD One

[App page](https://appshunter.io/ios/app/msd-one/id6474043630)

Enhance hybrid and in-person events with interactive features. Attendees receive personalized agendas, travel updates, and venue info. Facilitate audience engagement through Q&A, polls, and a secure social media wall.

**Highlights:** Personalized agendas, Real-time travel updates, Moderated Q&A panel, Slide saving with annotations, Audience polling and gamification, Private social media wall

**In-app purchases:** none


## Frequently asked questions

### Is My DIA free?

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

### Is MSD One free?

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

### Which has better reviews, My DIA or MSD One?

My DIA and MSD One are both rated 4.4 out of 5 on the App Store, from 97 and 7 ratings respectively.

### Do My DIA or MSD One have ads?

Neither My DIA nor MSD One shows ads.

### Which is updated more often, My DIA or MSD One?

My DIA ships an update weekly, and MSD One every 6 months. Most recently, My DIA was updated on September 17, 2026 and MSD One on September 27, 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.*