# CADi2 vs HDS

The clearest difference is review sentiment: HDS at 50% against CADi2's 25%. HDS also leads on update cadence (every 3 months vs every 12 months). CADi2's advantage is device support (3 vs 1) and iOS requirement (15.0 vs 17.0). On price, ads, in-app purchases and monetization model there is nothing between them.

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

CADi2 ships an update every 12 months, HDS every 3 months. The most recent releases landed on October 8, 2026 and October 6, 2026 respectively.

## The numbers

| Metric | CADi2 | HDS |
| --- | --- | --- |
| Price | Free | Free |
| Positive reviews | 25.0% of reviews | **50.0% of reviews** |
| In-app purchases | No | No |
| Ads | No | No |
| Update frequency | Every 12 months | **Every 3 months** |
| Monetization | Free | Free |
| Size | 56 MB | 13 MB |
| Requires iOS | **15.0** | 17.0 |
| Devices | **iPhone, iPad, iPod** | iPhone |
| Age rating | 4+ | 4+ |
| Developer | [ERISA K.K.](https://appshunter.io/developer/1692730435) | [ryo muranaka](https://appshunter.io/developer/1606480078) |

## What reviewers say

### 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


### HDS

[App page](https://appshunter.io/ios/app/hds-r/id1616574755)

This app digitizes the HDS-R cognitive assessment, allowing for easy recording and copy-pasting of results. It streamlines the evaluation process for healthcare professionals, enabling paperless record-keeping and efficient data input into medical charts.

**Highlights:** Digitizes HDS-R cognitive assessment, Records and copy-pastes results, Paperless record-keeping, Local data storage (no internet needed), Manages evaluators and subjects, Facilitates data comparison

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

**In-app purchases:** none


## Frequently asked questions

### Is CADi2 free?

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

### Is HDS free?

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

### Do CADi2 or HDS have ads?

Neither CADi2 nor HDS shows ads.

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

CADi2 ships an update every 12 months, and HDS every 3 months. Most recently, CADi2 was updated on October 8, 2026 and HDS on October 6, 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.*