# HDS vs CADi2

The clearest difference is review sentiment: HDS at 43% against CADi2's 25%. HDS also leads on iOS requirement (8.0 vs 15.0). CADi2's advantage is device support (3 vs 1). 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.

HDS ships an update every 10 months, CADi2 every 12 months. The most recent releases landed on October 2, 2026 and September 21, 2026 respectively.

## The numbers

| Metric | HDS | CADi2 |
| --- | --- | --- |
| Price | Free | Free |
| Rating | **[5.0 (1 ratings)](https://appshunter.io/ios/app/hds-r/id390880543/reviews)** | — |
| Number of ratings | **1** | — |
| Positive reviews | **42.9% of reviews** | 25.0% of reviews |
| In-app purchases | No | No |
| Ads | No | No |
| Update frequency | **Every 10 months** | Every 12 months |
| Monetization | Free | Free |
| Size | 21 MB | 56 MB |
| Requires iOS | **8.0** | 15.0 |
| Devices | iPad | **iPhone, iPad, iPod** |
| Age rating | 4+ | 4+ |
| Developer | [Pharmedico Co., Ltd](https://appshunter.io/developer/375288681) | [ERISA K.K.](https://appshunter.io/developer/1692730435) |

## What reviewers say

### HDS

[App page](https://appshunter.io/ios/app/hds-r/id390880543)

This application provides a digital version of a widely used cognitive assessment tool for screening dementia. It allows anyone to administer the test, which evaluates various brain functions through a series of questions. The results can help identify potential cognitive concerns, with a score below 20 out of 30 suggesting further medical evaluation.

**Highlights:** Digital cognitive assessment tool, Based on HDS-R scale, Screening for dementia, Evaluates brain function, Oral question administration, Voice guidance, Automatic calculation

**Features:** macOS Compatibility

**In-app purchases:** none


### CADi2

[App page](https://appshunter.io/ios/app/cadi2/id808586504)

This app offers a cognitive screening test designed for early detection of dementia. It includes 10 assessment items and a supplementary cognitive training game. Data is securely managed and used to improve app performance.

**Highlights:** Early dementia detection screening, 10 cognitive assessment items, Cognitive function training game, Data export via email or iTunes, Individual ID input for testing, Timed responses for assessment

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

**In-app purchases:** none


## Frequently asked questions

### Is HDS free?

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

### Is CADi2 free?

CADi2 is free to download, with no in-app purchases.

### Do HDS or CADi2 have ads?

Neither HDS nor CADi2 shows ads.

### Which is updated more often, HDS or CADi2?

HDS ships an update every 10 months, and CADi2 every 12 months. Most recently, HDS was updated on October 2, 2026 and CADi2 on September 21, 2026.

---

*Compared by [AppsHunter](https://appshunter.io/) from daily US App Store data. Review summaries are generated from verbatim App Store reviews.*