# Kois Reader vs IDDA

The clearest difference is review sentiment: IDDA at 100% against Kois Reader's 20%. IDDA also leads on update cadence (monthly vs every 9 months). Kois Reader's advantage is in-app purchases (none vs 10). On price, ads, device support and iOS requirement there is nothing between them.

Both are free to download. IDDA sells 6 one-off in-app purchases. Kois Reader asks for nothing beyond the download.

Kois Reader ships an update every 9 months, IDDA monthly. The most recent releases landed on August 14, 2026 and September 23, 2026 respectively.

## The numbers

| Metric | Kois Reader | IDDA |
| --- | --- | --- |
| Price | Free | Free |
| Rating | **[3.6 (10 ratings)](https://appshunter.io/ios/app/kois-reader/id1132199528/reviews)** | — |
| Number of ratings | **10** | — |
| Positive reviews | 20.0% of reviews | **100.0% of reviews** |
| In-app purchases | **No** | Yes |
| Ads | No | No |
| Update frequency | Every 9 months | **Monthly** |
| Monetization | **Free** | Free with in-app purchases |
| Size | 75 MB | 111 MB |
| Requires iOS | **14.0** | 15.2 |
| Devices | iPhone, iPad, iPod | iPhone, iPad, iPod |
| Age rating | 4+ | 4+ |
| Developer | [Kois Center](https://appshunter.io/developer/513136947) | [Digital Dental Academy Ltd](https://appshunter.io/developer/1512145084) |

## What reviewers say

### Kois Reader

[App page](https://appshunter.io/ios/app/kois-reader/id1132199528)

Access Kois Course materials, including manuals, checklists, and videos. Features live polling, automatic note backup and syncing across devices, and the ability to share notes with other participants. Requires course attendance for full access.

**Highlights:** Access course manuals and videos, Live in-course polling, Automatic note backup and sync, Share notes with participants, Browse page thumbnails, Navigation history

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

**In-app purchases:** none


### IDDA

[App page](https://appshunter.io/ios/app/idda/id1597746245)

Access comprehensive digital dentistry courses and develop specialized skills. Learn from global experts and enhance your clinical career with curated materials and mentorship.

**Highlights:** Digital dentistry courses, Skill development, Global expert faculty, Clinical career enhancement, Curated reading material, Mentorship

**Features:** macOS Compatibility

**In-app purchases (6)**

| Purchase | Price | Billing |
| --- | --- | --- |
| Partial Extraction Therapy | $199.99 | one-time |
| Ultimate All On X Course | $399.99 | one-time |
| CAM Materials Masterclass | $799.99 | one-time |
| Getting Started in 3D Printing | $799.99 | one-time |
| CAD Design Masterclass | $799.99 | one-time |
| Guided Implant Surgery | $899.99 | one-time |


## Frequently asked questions

### Is Kois Reader free?

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

### Is IDDA free?

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

### Do Kois Reader or IDDA have ads?

Neither Kois Reader nor IDDA shows ads.

### Which is updated more often, Kois Reader or IDDA?

Kois Reader ships an update every 9 months, and IDDA monthly. Most recently, Kois Reader was updated on August 14, 2026 and IDDA on September 23, 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.*