# IDDSI vs ASPEN ebook

The clearest difference is update cadence: ASPEN ebook at every 3 months against IDDSI's every 21 months. On price, ads, in-app purchases and device support there is nothing between them.

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

IDDSI ships an update every 21 months, ASPEN ebook every 3 months. The most recent releases landed on October 26, 2026 and October 15, 2026 respectively.

## The numbers

| Metric | IDDSI | ASPEN ebook |
| --- | --- | --- |
| Price | Free | Free |
| Rating | **[1.6 (14 ratings)](https://appshunter.io/ios/app/iddsi/id1145593063/reviews)** | — |
| Number of ratings | **14** | — |
| Positive reviews | 0.0% of reviews | — |
| In-app purchases | No | No |
| Ads | No | No |
| Update frequency | Every 21 months | **Every 3 months** |
| Monetization | Free | — |
| Size | 100 MB | 112 MB |
| Requires iOS | **15.0** | 15.6 |
| Devices | iPhone, iPad, iPod | iPhone, iPad, iPod |
| Age rating | 12+ | 4+ |
| Developer | [International Dysphagia Diet Standardisation Initiative Iddsi](https://appshunter.io/developer/1650465352) | [American Society for Parenteral and Enteral Nutrition (A.S.P.E.N.)](https://appshunter.io/developer/672253901) |

## What reviewers say

### IDDSI

[App page](https://appshunter.io/ios/app/iddsi/id1145593063)

Access the IDDSI framework for food texture and drink thickness testing. This tool provides easy lookup of descriptors and tests, suitable for all ages and care settings to assist individuals with dysphagia.

**Highlights:** IDDSI framework access, Food texture descriptors, Drink thickness tests, Easy lookup, Applicable to all ages, Supports all care settings

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

**In-app purchases:** none


### ASPEN ebook

[App page](https://appshunter.io/ios/app/aspen-ebook/id6748378007)

**In-app purchases:** none


## Frequently asked questions

### Is IDDSI free?

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

### Is ASPEN ebook free?

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

### Do IDDSI or ASPEN ebook have ads?

Neither IDDSI nor ASPEN ebook shows ads.

### Which is updated more often, IDDSI or ASPEN ebook?

IDDSI ships an update every 21 months, and ASPEN ebook every 3 months. Most recently, IDDSI was updated on October 26, 2026 and ASPEN ebook on October 15, 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.*