# Litt's Drug Eruption Database vs GRAPPA App

The clearest difference is iOS requirement: Litt's Drug Eruption Database at 9.3 against GRAPPA App's 13.0. On price, update cadence, ads and in-app purchases there is nothing between them.

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

Litt's Drug Eruption Database ships an update every 4 months, GRAPPA App every 3 months. The most recent releases landed on October 26, 2026 and October 8, 2026 respectively.

## The numbers

| Metric | Litt's Drug Eruption Database | GRAPPA App |
| --- | --- | --- |
| Price | Free | Free |
| Rating | — | **[5.0 (2 ratings)](https://appshunter.io/ios/app/grappa-app/id1346646781/reviews)** |
| Number of ratings | — | **2** |
| In-app purchases | No | No |
| Ads | No | No |
| Update frequency | Every 4 months | **Every 3 months** |
| Monetization | — | Free |
| Size | 17 MB | 64 MB |
| Requires iOS | **9.3** | 13.0 |
| Devices | iPhone, iPad, iPod | iPhone, iPad, iPod |
| Age rating | 17+ | 17+ |
| Developer | [AMADataSet Limited](https://appshunter.io/developer/1318153511) | [Group for Research and Assessment of Psoriasis and Psoriatic Arthritis](https://appshunter.io/developer/1346646780) |

## What reviewers say

### Litt's Drug Eruption Database

[App page](https://appshunter.io/ios/app/litts-drug-eruption-database/id1318153512)

**Features:** macOS Compatibility

**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 Litt's Drug Eruption Database free?

Litt's Drug Eruption Database is free to download, with no in-app purchases.

### Is GRAPPA App free?

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

### Do Litt's Drug Eruption Database or GRAPPA App have ads?

Neither Litt's Drug Eruption Database nor GRAPPA App shows ads.

### Which is updated more often, Litt's Drug Eruption Database or GRAPPA App?

Litt's Drug Eruption Database ships an update every 4 months, and GRAPPA App every 3 months. Most recently, Litt's Drug Eruption Database was updated on October 26, 2026 and GRAPPA App on October 8, 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.*