# GRAPPA App vs Vitiligo Calculator

The clearest difference is update cadence: Vitiligo Calculator at every 3 weeks against GRAPPA App's every 3 months. 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 GRAPPA App against 5.0 for Vitiligo Calculator. Both are backed by a comparable volume of ratings — 2 and 1 respectively.

GRAPPA App ships an update every 3 months, Vitiligo Calculator every 3 weeks. The most recent releases landed on October 8, 2026 and October 24, 2026 respectively.

## The numbers

| Metric | GRAPPA App | Vitiligo Calculator |
| --- | --- | --- |
| Price | Free | Free |
| Rating | [5.0 (2 ratings)](https://appshunter.io/ios/app/grappa-app/id1346646781/reviews) | [5.0 (1 ratings)](https://appshunter.io/ios/app/vitiligo-calculator/id1448599349/reviews) |
| Number of ratings | **2** | 1 |
| Positive reviews | — | 100.0% of reviews |
| In-app purchases | No | No |
| Ads | No | No |
| Update frequency | Every 3 months | **Every 3 weeks** |
| Monetization | Free | Free |
| Size | 64 MB | 38 MB |
| Requires iOS | 13.0 | **12.1** |
| Devices | **iPhone, iPad, iPod** | iPhone, iPod |
| Age rating | 17+ | 12+ |
| Developer | [Group for Research and Assessment of Psoriasis and Psoriatic Arthritis](https://appshunter.io/developer/1346646780) | [UZ Gent](https://appshunter.io/developer/1448599348) |

## What reviewers say

### 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


### Vitiligo Calculator

[App page](https://appshunter.io/ios/app/vitiligo-calculator/id1448599349)

This app helps physicians calculate the Vitiligo Extent Score (VES) to assess the overall vitiligo involvement of the body. It supports clinical trials and daily practice by calculating scores per body part and summarizing them in a PDF report.

**Highlights:** Vitiligo Extent Score (VES) calculator, Calculate extent per body part, Generate PDF summary reports, Visual aids for lesion extent, Supports clinical trials and practice

**Features:** macOS Compatibility

**In-app purchases:** none


## Frequently asked questions

### Is GRAPPA App free?

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

### Is Vitiligo Calculator free?

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

### Which has better reviews, GRAPPA App or Vitiligo Calculator?

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

### Do GRAPPA App or Vitiligo Calculator have ads?

Neither GRAPPA App nor Vitiligo Calculator shows ads.

### Which is updated more often, GRAPPA App or Vitiligo Calculator?

GRAPPA App ships an update every 3 months, and Vitiligo Calculator every 3 weeks. Most recently, GRAPPA App was updated on October 8, 2026 and Vitiligo Calculator on October 24, 2026.

---

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