Comparison

Calculate by QxMD vs SOFA ⊗

Price, ratings, monetisation and update history for both apps, side by side — with what reviewers say about each.

Head to head
About

Calculate by QxMD

This clinical calculator and decision support tool offers over 200 medical calculators and tools for diagnosis, treatment, and prognosis. It adapts to your practice and provides detailed references, integrating with PubMed and Read by QxMD.

Highlights
  • Over 200 medical calculators
  • Clinical decision support tools
  • Cardiology, internal medicine, and more
  • Knowledge translation from research
  • Question Flow technology
  • PubMed & Read integration
  • SI and Imperial units
Features
Read full description

From the developer of 'Read by QxMD', 'The ECG Guide' and 'Pedi STAT' comes 'Calculate', a next-generation clinical calculator and decision support tool, freely available to the medical community. "We recommend medical users try the free Calculate by QxMD first..." -from iMedicalApps review "The best free Medical Calculator apps for the iPhone" 'Calculate' highlights tools which impact clinical practice either by simplifying diagnosis, clarifying treatment options or displaying prognosis. Helping you make decisions, not just calculate numbers... Features • Developed by a collaboration of clinician experts from diverse backgrounds • Point-of-care tools in the areas of cardiology, internal medicine, primary care, nephrology, hematology, hepatology, gastroenterology, emergency medicine, oncology, orthopedics, critical care/ICU, ENT, radiology, rheumatology, mental health, respirology, neurology, pediatrics, infectious disease, neurosurgery, general surgery, vascular surgery, and obstetrics. • Converts recent research publications into practical handheld tools - knowledge translation at its best • Automatically adapts to your clinical practice • Unique ‘Question Flow’ technology gets you answers, fast • Detailed references with PubMed & Read integration • Comprehensive and insightful results • Elegant design and intuitive interface • SI and Imperial units More than 200 unique calculators and decision support tools While too extensive to list them all, here is a small sampling of included content: Guide treatment • Determine cardiovascular risk using ACC/AHA, Framingham, Gupta and VQI Cardiac Risk Index • CHADS2 & CHA2DS2-VASc to guide treatment in atrial fibrillation • Understand bleeding risk in atrial fibrillation using HAS-BLED & OBRI • TIMI risk score in ACS • CIWA in alcohol withdrawal • Rule of 9s & Parkland formula in burns • Water deficit in hypernatremia • Timing of surgery with Aortic Stenosis Risk Score • Risk stratify pneumonia (CURB-65, PORT) • NIH Stroke Scale in acute stroke • Imaging in possible subarachnoid hemorrhage with Ottawa SAH Rule Determine Prognosis • Cirrhosis (MELD, Child-Pugh) • Chronic Kidney Disease (Kidney Failure Risk Equation) • Heart failure • Lymphoma (NCCN-IPI, IPI24, R-IPI) • Myelodysplastic Syndrome (IPSS-R, WPSS) • Myeloma (ISS, R-ISS) • Hemodialysis • COPD (Bode) • Pancreatitis (BISAP, Ranson's) • Cardiac surgery (Euroscore II, Cleveland Clinic, Mehta) • Critical care (APACHE II, SOFA) • Neurologic outcome (DRAGON, CAM-ICU, modified Rankin, FOUR score, Hunt & Hess) Calculate • Ideal body weight, BMI and BSA • Due date and gestational age • Extensive formula used in echocardiography and invasive hemodynamic monitoring • Kt/V in dialysis patients • eGFR with CKD-EPI, MDRD & Schwartz • A-a gradient Classify • Angina (CCS) • Congestive heart failure (NYHA) Screen • Diabetes • Breast cancer Reduce and predict perioperative complications • WHO Surgical Safety Checklist • Predictive models for cardiac surgery, vascular surgery and coronary angiography • Postoperative Respiratory Failure Risk score Manage • Head, neck, ankle and knee injuries (NEXUS, Ottawa ankle/knee, Canadian C-spine and CT head rules) • DVT and PE (PERC, Wells, PESI) • Pulmonary nodules • TIA (ABCD2) Stage • Lung cancer • Renal cell carcinoma • Head & neck cancers Understand • TTKG in hypokalemia and hyperkalemia • Dermatomes Diagnose • Heparin Induced Thrombocytopenia • Infective Endocarditis • ARDS • Autoimmune Hepatitis • Sleep disorder (Epworth Sleepiness Scale) And much, much more... Researchers, contact us to see your research in our app at contact@qxmd.com Founded my medical professionals, QxMD Software is dedicated to creating high quality, point-of-care tools for practicing health care professionals. Recognized as a leading developer of free medical software for mobile devices, QxMD develops content in cooperation with expert physicians from their respective fields.

About

SOFA ⊗

This medical app calculates the Sequential Organ Failure Assessment (SOFA) score. It assesses organ system performance and assigns a score to determine the risk of mortality for ICU patients. A higher SOFA score indicates a greater likelihood of mortality.

Highlights
  • SOFA score calculation
  • Organ system assessment
  • Mortality risk determination
  • ICU patient data analysis
Read full description

The Sequential Organ Failure Assessment (SOFA) score is the interactive scoring system that assesses the performance of several organ systems in the body & assigns a score based on the data obtained in each category. After sofa score calculation process, it generates the risk of mortality for ICU patients. The higher the SOFA score, the higher the likely mortality.

Screenshots

Calculate by QxMD4 screens
SOFA ⊗4 screens

Verdict

The call

The clearest difference is ads: SOFA ⊗ at none against Calculate by QxMD's shown. SOFA ⊗ also leads on monetization model (free vs free with in-app purchases) and rating (5.0 vs 4.8). Calculate by QxMD's advantage is ratings volume (5.1K vs 1) and update cadence (every 6 weeks vs every 4 months). On price, in-app purchases and device support 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

CostPrice · In-app purchases · Ads · Monetization

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

ReceptionRating · Positive reviews · Number of ratings

SOFA ⊗ holds the better App Store score, 5.0 against 4.8. That said, the two scores are not equally well evidenced: Calculate by QxMD has 5.1K ratings behind it against 1, so its average is the more settled of the two.

UpkeepUpdate frequency

Calculate by QxMD ships an update every 6 weeks, SOFA ⊗ every 4 months. The most recent releases landed on November 6, 2026 and November 2, 2026 respectively.

Scorecard6 real differences · 4 level
Calculate by QxMD versus SOFA ⊗: the parameters behind the verdict, then further details
ParameterCalculate by QxMDSOFA ⊗
PriceFreeFree
Rating4.8 (5.1K ratings)5.0 (1 ratings) — better
Positive reviews86.5% of reviews—
Number of ratings5.1K — better1
Update frequencyEvery 6 weeks — betterEvery 4 months
AdsYesNo — better
In-app purchasesNoNo
MonetizationFree with in-app purchasesFree — better
DevicesiPhone, iPadiPhone, iPad, iPod — better
Requires iOS16.09.0 — better
Further details — not scored
Size118 MB9 MB
Age rating17+4+
DeveloperWebMDMd. Mamun-Ur-Rashid

Customer experience

Calculate by QxMD

All ratings5,100 ratings
Positive96.0%
Neutral2.2%
Negative1.8%
Written reviews776 reviews
Positive86.5%
Neutral5.5%
Negative8.0%

SOFA ⊗

All ratings1 ratings
Positive100.0%
Neutral0.0%
Negative0.0%

Bugs and requests

Calculate by QxMD

Reported bugs

5 issues
  • App freezes when using multiple calculators
  • Unable to add items to favorites list
  • Unable to see calculation results after input
  • App crashes on startup without internet connection
  • Landscape mode not working on iPad

Requested features

5 requests
  • Dark mode option
  • Ability to save/favorite frequently used calculators
  • Integration with electronic health records
  • Metric to imperial unit conversion
  • More specialized calculators (e.g., opioid equivalence, pediatric BP)

SOFA ⊗

Not enough reviews yet to summarise bugs or requests.

In-app purchases

None

Calculate by QxMD

No in-app purchases

None

SOFA ⊗

No in-app purchases

Questions

Is Calculate by QxMD free?
Calculate by QxMD is free to download, with no in-app purchases.
Is SOFA ⊗ free?
SOFA ⊗ is free to download, with no in-app purchases.
Which has better reviews, Calculate by QxMD or SOFA ⊗?
SOFA ⊗ is rated higher. Calculate by QxMD averages 4.8 out of 5 from 5.1K ratings, while SOFA ⊗ averages 5.0 from 1 ratings.
Do Calculate by QxMD or SOFA ⊗ have ads?
Calculate by QxMD shows ads; SOFA ⊗ does not.
Which is updated more often, Calculate by QxMD or SOFA ⊗?
Calculate by QxMD ships an update every 6 weeks, and SOFA ⊗ every 4 months. Most recently, Calculate by QxMD was updated on November 6, 2026 and SOFA ⊗ on November 2, 2026.

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