DAS Calculator vs RheumHub
Price, ratings, monetisation and update history for both apps, side by side — with what reviewers say about each.
DAS Calculator
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.
- 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
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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®
RheumHub
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Scientific contributions The possibility of free registration for most workshops, courses and conferences within the State of Kuwait The possibility of obtaining discounts in registering and attending in-person or virtual international conferences Offers and discounts Special offers and discounts of available services and social events for registered doctors and their families. Volunteer work Available volunteering participation (conference, workshop, community awareness, etc.) Electronic voting Participating in voting on topics of interest to rheumatologists Health area Reminders before the dates of activities and events Rheumatology magazine Publishing an electronic rheumatology magazine Activities and events Publishing details of the association’s activities and events
Screenshots
Verdict
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.
Scored on Price · Rating · Positive reviews · Number of ratings · Update frequency · Ads · In-app purchases · Monetization · Best chart rank · Devices · Requires iOS
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.
| Parameter | DAS Calculator | RheumHub |
|---|---|---|
| Price | Free | Free |
| Rating | 5.0 (1 ratings) — better | — |
| Positive reviews | 55.6% of reviews | — |
| Number of ratings | 1 — better | — |
| Update frequency | Every 4 months | Fortnightly — better |
| Ads | No | No |
| In-app purchases | Yes | No — better |
| Monetization | Free with in-app purchases | — |
| Devices | iPhone, iPad, iPod — better | iPhone, iPod |
| Requires iOS | 13.0 | 12.0 — better |
| Further details — not scored | ||
| Size | 1 MB | 75 MB |
| Age rating | 4+ | 12+ |
| Developer | Greg Fiumara | Kuwait Association of Rheumatology (KAR) |
In-app purchases
DAS Calculator
- Unlock All Calculators$1.99
RheumHub
No in-app purchases
Questions
Is DAS Calculator free?
Is RheumHub free?
Do DAS Calculator or RheumHub have ads?
Which is updated more often, DAS Calculator or RheumHub?
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