# DST vs OCS

The clearest difference is price: OCS at Free against DST's $4.99. DST's advantage is chart position (#113 vs unranked) and update cadence (every 6 months vs every 12 months). On ads, in-app purchases, device support and iOS requirement there is nothing between them.

OCS is free to download; DST costs $4.99 up front. Neither carries in-app purchases, so what you see is what you pay.

DST ships an update every 6 months, OCS every 12 months. The most recent releases landed on October 25, 2026 and October 5, 2026 respectively.

## The numbers

| Metric | DST | OCS |
| --- | --- | --- |
| Price | $4.99 | **Free** |
| Rating | **[4.7 (3 ratings)](https://appshunter.io/ios/app/dst-dementia-screening-test/id1438095250/reviews)** | — |
| Number of ratings | **3** | — |
| Positive reviews | 50.0% of reviews | — |
| In-app purchases | No | No |
| Ads | No | No |
| Update frequency | **Every 6 months** | Every 12 months |
| Monetization | Paid | — |
| Best chart rank | **#113** | — |
| Size | 33 MB | 138 MB |
| Requires iOS | 12.4 | **11.0** |
| Devices | iPhone, iPad, iPod | iPhone, iPad, iPod |
| Age rating | 17+ | 12+ |
| Developer | [Sebastian Dr. Horn](https://appshunter.io/developer/1438095249) | [University of Oxford](https://appshunter.io/developer/688778837) |

## What reviewers say

### DST

[App page](https://appshunter.io/ios/app/dst-dementia-screening-test/id1438095250)

**Currently charting:** #113 Top Paid · Medical (US App Store)

This medical device app screens for early dementia risks and monitors severity over time. It offers regular reminders for retesting, provides dementia news, and visualizes risk progression. Results can be emailed or printed for documentation.

**Highlights:** Early dementia risk detection, Risk severity monitoring, Retest reminders (3-6 months), Dementia news and prevention, Visualized risk tracking, Email/print test results

**Features:** Vision Pro support

**In-app purchases:** none


### OCS

[App page](https://appshunter.io/ios/app/ocs-plus/id1514766032)

**Features:** Vision Pro support

**In-app purchases:** none


## Frequently asked questions

### Is DST free?

DST costs $4.99, with no in-app purchases.

### Is OCS free?

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

### Do DST or OCS have ads?

Neither DST nor OCS shows ads.

### Which is updated more often, DST or OCS?

DST ships an update every 6 months, and OCS every 12 months. Most recently, DST was updated on October 25, 2026 and OCS on October 5, 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.*