# DAS Calculator

> Rheumatoid arthritis disease activity scoring and tracking tool for medical professionals. (iPhone/iPad app by Greg Fiumara.)

- Source: https://appshunter.io/ios/app/das-calculator/id354092306 (this page in markdown: same URL + `.md`)
- Developer: [Greg Fiumara](https://appshunter.io/developer/354092309)
- Category: Medical, Health & Fitness
- Price: Free with in-app purchases
- Rating: 5.00/5 from 1 App Store ratings · 9 written reviews indexed
- Age rating: 4+
- Requires: iOS 13.0 · 1 MB
- Languages: American English
- Released: 2010-04-06
- Data updated: 2026-08-24
- Monetization: free with in-app purchases
- User reviews in markdown: https://appshunter.io/ios/app/das-calculator/id354092306/reviews.md

## What is DAS Calculator?

DAS, or "Disease Activity Score," is a measure of the activity of rheumatoid arthritis. Based on the work of the Department of Rheumatology at the University Medical Centre at Nigmegen (Netherlands), a validated tool (formula) was developed to evaluate and track Rheumatoid Arthritis disease activity. By measuring the tender and swollen joint counts (TJC & SJC respectively), CRP (c-reactive protein) and General Health, the DAS 28-4 gives an estimate of disease activity, while the DAS 28-3 uses just the TJC, SJC & CRP. Clinicians, rheumatologists in training, educators and researchers use this tool everyday and now you can have it readily available on your Apple mobile device.

The following formulas are free for you to try.
• DAS28-CRP
• DAS28-CRP (3 Variable)
• DAS/DAS28 Converter
You may use these forever and never be nagged.  There are no ads.  Enjoy!

If you like what you see, upgrade to the "Pro" version via one-time in-app purchase.  This will unlock all remaining formulas, including:
• DAS28
• DAS28 (3 Variable)
• DAS-CRP
• DAS-CRP (3 Variable)
• Original DAS
• Original DAS (3 Variable)
• CDAI
• SDAI
• Cumulative and Weighed RAPID3®

## Key features

- 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

## Pricing and in-app purchases

Base price: Free.

**One-time purchases**

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


## Recent user reviews (9 of 9)

All indexed reviews: https://appshunter.io/ios/app/das-calculator/id354092306/reviews.md

### 1/5 — DAS calculator

*2019-03-16*

I can’t use it all blurred and on top of each other!

### 4/5 — Excelente

*2012-03-18, version 1.7.0*

Muy buena aplicación

### 5/5 — Great application

*2012-01-27*

The app is an excellent DAS calculator. It's easy to use and beautifully designed. Even the icon is gorgeous. I use this app in practice and highly recommend it. You get a few of the scores for free and for a ridiculously low price of a buck you can have the complete set of disease activity related scores. If you're a rheumatologist and don't have this on your iPhone, shame on you; if you can't afford it, email me and I'll buy it for you.

### 1/5 — New version so bad

*2011-06-08*

I am very disappointed with this new version.  back to the old version so much better than this

### 1/5 — Cheating

*2011-04-11*

Had this since 3 months. Downloaded while it was free. Recently upgraded after getting a prompt. 

Except for useless DAS versions, everything else has been changed to paid version. 

I understand they have to make money but never had an app which tried to trick you into buying it!!! Never trust this company again and yeah - not going to pay a penny for it

### 5/5 — Thank you!

*2011-01-11*

Thank you!

### 5/5 — Rheumatoid Arthritis Patients Deserve Objective Measurement

*2010-06-27*

If you see patients with Rheumatoid Arthritis and want to compare how they are doing, this is a great tool!  It allows for measurement of several different variables in different combinations which allow calculation of the DAS Score.  The DAS Score is a standard measurement of Rheumatoid Arthritis Disease Activity.  This tool calculates the DAS Score quickly and efficiently and is well designed to be used in real-world settings while seeing patients as well as in clinical research settings.  I highly recommend this to anyone who takes care of patients with Rheumatoid Arthritis.

### 4/5 — MB

*2010-05-28, version 0*

Muy buena aplicación y sobre todo práctica para Reumatólogos. Para alcanzar la excelencia podrían actualizarla agregando las escalasBASDAI y BASFI para Espondilitis Anquilosante y HAQ para Artritis Reumatoide. aunque cobren por ello. De cualquier forma bien por ser gratuita!!!

### 1/5 — No real added value

*2010-05-26*

Most common das calculators ( like the esr based) are locked and the apps promted to get the pro ( pay per view) apps. Considering the formulas are not complex,  it's not a good deal at all.

## Frequently asked questions about DAS Calculator

### What is DAS Calculator used for?

DAS Calculator is used to measure and track the activity of rheumatoid arthritis. It utilizes validated formulas to estimate disease activity based on joint counts, CRP levels, and general health.

### What formulas are included in the free version of DAS Calculator?

The free version of DAS Calculator includes DAS28-CRP, DAS28-CRP (3 Variable), and a DAS/DAS28 Converter. These formulas can be used indefinitely without ads.

### How can I access more formulas in DAS Calculator?

You can unlock all remaining formulas, including DAS28, DAS-CRP, Original DAS, CDAI, SDAI, and RAPID3®, by upgrading to the "Pro" version through a one-time in-app purchase.

### Does DAS Calculator have ads?

No, DAS Calculator is ad-free. The description explicitly states, "There are no ads. Enjoy!"

### What is the rating and update frequency of DAS Calculator?

DAS Calculator has a perfect 5.0-star rating from 1 review. It was last updated on September 19, 2019, with version 1.13.3.

### What devices is DAS Calculator compatible with?

DAS Calculator is available for iPhone, iPad, and iPod devices. It has an age rating of 4+.

### Is DAS Calculator suitable for patients or only for medical professionals?

While developed for clinicians, rheumatologists in training, educators, and researchers, the tool's formulas can be used by anyone interested in tracking rheumatoid arthritis disease activity.

## Version history (last 5 releases)

### 1.13.3 — 2019-09-19

Support for iOS 13 dark mode.

### 1.13.2 — 2018-12-06

Natively support the screen sizes of the latest iOS devices.

### 1.13.1 — 2017-11-06

Support larger screen sizes.

### 1.13 — 2015-09-16

[NEW] Built against iOS 9.
[NEW] Added score to numpad toolbar when numpad would otherwise block the score.
[FIX] Numpad would sometimes obscure text fields.
[REM] Fabric/Crashlytics has been completely removed. Crashes will only be reported via the iOS opt-in method (please opt-in).

### 1.12 — 2015-08-24

[NEW] Weighed RAPID3™ calculator.
[CHG] Existing "RAPID 3" calculator has been renamed "Cumulative RAPID3™."
[CHG] Modernized crash handling and networking code.

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## More apps by Greg Fiumara

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- [Hangman TV](https://appshunter.io/ios/app/hangman-tv/id1054367332)
- [Twenty One (XXI)](https://appshunter.io/ios/app/twenty-one-xxi/id1059178930)

All apps by Greg Fiumara: https://appshunter.io/developer/354092309

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*Data collected daily from the US App Store and indexed by [AppsHunter](https://appshunter.io/). User reviews are verbatim App Store reviews. Ratings, prices and chart positions refresh continuously; this snapshot is from 2026-08-24.*