# ASAS App vs GRAPPA App

The clearest difference is update cadence: GRAPPA App at every 3 months against ASAS App's every 20 months. GRAPPA App also leads on iOS requirement (13.0 vs 15.6). On price, rating, ratings volume and ads there is nothing between them.

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

On the App Store both sit at effectively the same score — 5.0 for ASAS App against 5.0 for GRAPPA App. Both are backed by a comparable volume of ratings — 1 and 2 respectively.

ASAS App ships an update every 20 months, GRAPPA App every 3 months. The most recent releases landed on September 15, 2026 and July 19, 2026 respectively.

## The numbers

| Metric | ASAS App | GRAPPA App |
| --- | --- | --- |
| Price | Free | Free |
| Rating | [5.0 (1 ratings)](https://appshunter.io/ios/app/asas-app/id650291528/reviews) | [5.0 (2 ratings)](https://appshunter.io/ios/app/grappa-app/id1346646781/reviews) |
| Number of ratings | 1 | **2** |
| In-app purchases | No | No |
| Ads | No | No |
| Update frequency | Every 20 months | **Every 3 months** |
| Monetization | Free | Free |
| Size | 45 MB | 64 MB |
| Requires iOS | 15.6 | **13.0** |
| Devices | iPhone, iPad, iPod | iPhone, iPad, iPod |
| Age rating | 17+ | 17+ |
| Developer | [Stichting Assessment of Spondyloarthritis international Society](https://appshunter.io/developer/650291731) | [Group for Research and Assessment of Psoriasis and Psoriatic Arthritis](https://appshunter.io/developer/1346646780) |

## What reviewers say

### ASAS App

[App page](https://appshunter.io/ios/app/asas-app/id650291528)

This medical app provides essential tools for assessing Ankylosing Spondylitis. It includes calculators for key disease activity scores and offers comprehensive information on diagnosis, classification, and treatment of spondyloarthritis.

**Highlights:** ASDAS calculator, BASDAI calculator, Spondyloarthritis classification, Diagnosis information, Treatment guidelines, ASAS Health Index

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

**In-app purchases:** none


### GRAPPA App

[App page](https://appshunter.io/ios/app/grappa-app/id1346646781)

This medical application aids in the assessment of patients with psoriatic arthritis and psoriasis. It provides tools to calculate disease severity scores and includes patient-completed questionnaires in multiple languages. Access to GRAPPA resources is also available.

**Highlights:** Psoriatic arthritis and psoriasis assessment, Disease severity calculators (MDA, PASI, BSA), Patient-completed questionnaires (PsAID, PEST, HAQ), Multilingual questionnaire support, Access to GRAPPA resources

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

**In-app purchases:** none


## Frequently asked questions

### Is ASAS App free?

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

### Is GRAPPA App free?

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

### Which has better reviews, ASAS App or GRAPPA App?

ASAS App and GRAPPA App are both rated 5.0 out of 5 on the App Store, from 1 and 2 ratings respectively.

### Do ASAS App or GRAPPA App have ads?

Neither ASAS App nor GRAPPA App shows ads.

### Which is updated more often, ASAS App or GRAPPA App?

ASAS App ships an update every 20 months, and GRAPPA App every 3 months. Most recently, ASAS App was updated on September 15, 2026 and GRAPPA App on July 19, 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.*