# DAS Calculator vs RheumHub

The clearest difference is in-app purchases: RheumHub at none against DAS Calculator's 1. RheumHub also leads on update cadence (fortnightly vs every 4 months). On price, ads, device support and iOS requirement there is nothing between them.

Both are free to download. DAS Calculator sells 1 one-off in-app purchase. RheumHub asks for nothing beyond the download.

DAS Calculator ships an update every 4 months, RheumHub fortnightly. The most recent releases landed on November 1, 2026 and October 26, 2026 respectively.

## The numbers

| Metric | DAS Calculator | RheumHub |
| --- | --- | --- |
| Price | Free | Free |
| Rating | **[5.0 (1 ratings)](https://appshunter.io/ios/app/das-calculator/id354092306/reviews)** | — |
| Number of ratings | **1** | — |
| Positive reviews | 55.6% of reviews | — |
| In-app purchases | Yes | **No** |
| Ads | No | No |
| Update frequency | Every 4 months | **Fortnightly** |
| Monetization | Free with in-app purchases | — |
| Size | 1 MB | 75 MB |
| Requires iOS | 13.0 | **12.0** |
| Devices | **iPhone, iPad, iPod** | iPhone, iPod |
| Age rating | 4+ | 12+ |
| Developer | [Greg Fiumara](https://appshunter.io/developer/354092309) | [Kuwait Association of Rheumatology (KAR)](https://appshunter.io/developer/1478144214) |

## What reviewers say

### DAS Calculator

[App page](https://appshunter.io/ios/app/das-calculator/id354092306)

This medical tool helps evaluate and track rheumatoid arthritis disease activity using validated formulas. It calculates scores based on joint counts, CRP, and general health, providing an estimate of disease progression for clinicians and researchers.

**Highlights:** Rheumatoid arthritis disease activity scoring, Track disease activity over time, Validated formulas for DAS28-CRP, Includes DAS/DAS28 converter, Unlock additional formulas with Pro version

**In-app purchases (1)**

| Purchase | Price | Billing |
| --- | --- | --- |
| Unlock All Calculators | $1.99 | one-time |


### RheumHub

[App page](https://appshunter.io/ios/app/rheumhub/id1358113246)

**Features:** macOS Compatibility

**In-app purchases:** none


## Frequently asked questions

### Is DAS Calculator free?

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

### Is RheumHub free?

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

### Do DAS Calculator or RheumHub have ads?

Neither DAS Calculator nor RheumHub shows ads.

### Which is updated more often, DAS Calculator or RheumHub?

DAS Calculator ships an update every 4 months, and RheumHub fortnightly. Most recently, DAS Calculator was updated on November 1, 2026 and RheumHub on October 26, 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.*