Comparison

BiliCalc vs The OB Wheel Pro 7

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

Head to head
About

BiliCalc

This app calculates phototherapy thresholds for newborns based on age, bilirubin levels, and neurotoxicity risk, referencing AAP guidelines. It displays values on a phototherapy nomogram and identifies the patient's risk zone using the Bhutani Nomogram.

Highlights
  • Calculates phototherapy threshold for newborns
  • Displays values on phototherapy nomogram
  • Identifies patient risk zone using Bhutani Nomogram
  • Calculates age from birth and lab times
  • Direct links to reference articles and risk factors
  • Supports US and SI units
Features
Currently charting
Read full description

BiliCalc is a neonatal bilirubin calculator and clinical reference for healthcare professionals caring for newborn infants born at 35 or more weeks of gestation. Calculations are based on the 2022 American Academy of Pediatrics (AAP) Clinical Practice Guideline for the management of hyperbilirubinemia in newborn infants 35 or more weeks of gestation. Enter the infant's postnatal age, gestational age at birth, bilirubin value, measurement type, applicable neurotoxicity risk factors, and phototherapy status to view: • Patient-specific phototherapy, escalation-of-care, and exchange-transfusion thresholds • A graph displaying the bilirubin value and applicable treatment thresholds • Guideline-based treatment recommendations • Post-discharge follow-up guidance, when applicable No internet connection is required for calculations. BiliCalc performs calculations locally on the device and can be used without Wi-Fi or cellular data. BiliCalc is designed for quick clinical reference and does not measure bilirubin. Bilirubin values and other clinical information must be obtained independently and entered by the healthcare professional. Clinical references and links to source material are available within the app. BiliCalc is intended to support, not replace, professional clinical judgment. It is independently developed and is not affiliated with, sponsored by, or endorsed by the American Academy of Pediatrics. The app itself is available in English, Spanish and Portuguese, including its interface, results, charts and clinical guidance. BiliCalc automatically uses your preferred supported device language. You can also choose a language in Info. Regional language variants are recognized, and number formatting follows your device region.

About

The OB Wheel Pro 7

This medical tool assists healthcare professionals in prenatal care by calculating gestational age, fetal weight, and risk tables. It offers a comprehensive suite of calculators for EDD, LMP, conception dates, and ultrasound biometrics, replacing multiple apps and physical wheels.

Highlights
  • Gestational Age Calculator
  • Ultrasound Biometric Calculator
  • Fetal Weight Calculator
  • Risk Table for Trisomy 21
  • BMI Calculator
  • Apple Watch App
Features
Read full description

The OB Wheel Pro 7 is the most complete, powerful, and easiest-to-use tool for healthcare professionals providing prenatal care. In just ONE app there is 1) a gestational age calculator, 2) an ultrasound biometric calculator, 3) a fetal weight calculator, 4) a list of key weeks and trimesters, 5) an age-adjusted risk table for trisomy 21 and aneuploidy, 6) a BMI calculator, and NOW 7) an Apple Watch app is included with your purchase! The OB Wheel Pro 7 is a state-of-the-art gestational age calculator (also known as an obstetric or pregnancy wheel) that is used every day by doctors, obstetricians, midwives, nurses, and pregnant women. The OB Wheel Pro 7 is a professional tool that replaces the need for multiple apps and it greatly enhances the functionality of those worn-out cardboard wheels without compromise. The OB Wheel Pro 7 accurately determines the estimated delivery date (EDD), or due date, of a pregnancy based on the first day of a woman's last menstrual period (LMP), or from the date of conception, or from a known gestational age (GA) on a known date, e.g. from an ultrasound measurement, or from fetal biometry like Crown-Rump Length (CRL), Femur Length (FL), and BiParietal Diameter (BPD). Additionally, for appropriate gestational ages, The The OB Wheel Pro 7 estimates fetal weight and displays the number of days completed and remaining. The OB Wheel Pro 7, besides calculating GA from fetal ultrasound biometrics, enables clinicians to also calculate Estimated Fetal Weight (EFW) from FL, BPD, Head Circumference (HC), and Abdominal Circumference (AC) using the most appropriate published reference formula using the maximum and most appropriate parameters. Prenatal care providers know that there are key gestational ages where testing or interventions are needed. The OB Wheel Pro 7 lets providers see at a glance when these items should be scheduled. FEATURES • Includes Apple Watch app! • Gestational Age Calculator from LMP, EDD, Conception Date for any reference date • Gestational Age calculated from specific date and gestational age (e.g. ultrasound) • Gestational Age Calculator using fetal biometrics (CRL, FL, BPD) • Fetal Weight Calculator using HC, AC, FL, BPD • Body Mass Index (BMI) Calculator • Age-Adjusted Risk Table for Trisomy 21 and aneuploidy • List of key completed weeks during pregnancy • Pregnancy days completed and remaining, and dates for each trimester • Remembers last-used EDD PRO TIPS: • To enter Gestational Age, CRL, FL, or BPD for a specific date (like for an ultrasound exam), tap "Today", enter the desired date, then tap on the button displaying the gestational age to change that button to display options for entering a specific GA, CRL, FL, and BPD. • When using the GA calculator, double-tap a date to change the value to the current date. • When using the EFW calculator, double-tap a value to clear the value of the selected parameter.

Screenshots

BiliCalc4 screens
The OB Wheel Pro 74 screens

Verdict

The call

The clearest difference is monetization model: BiliCalc at free against The OB Wheel Pro 7's paid. BiliCalc also leads on review sentiment (66% vs 41%) and update cadence (every 2 months vs every 9 months). The OB Wheel Pro 7's advantage is iOS requirement (11.0 vs 16.0). On price, ads, 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

BiliCalc costs $1.99 and The OB Wheel Pro 7 $1.99 up front. Neither carries in-app purchases, so what you see is what you pay.

UpkeepUpdate frequency

BiliCalc ships an update every 2 months, The OB Wheel Pro 7 every 9 months. Both last shipped on November 1, 2026.

Scorecard5 real differences · 6 level
BiliCalc versus The OB Wheel Pro 7: the parameters behind the verdict, then further details
ParameterBiliCalcThe OB Wheel Pro 7
Price$1.99$1.99
Rating—4.0 (5 ratings) — better
Positive reviews65.5% of reviews — better41.2% of reviews
Number of ratings—5 — better
Update frequencyEvery 2 months — betterEvery 9 months
AdsNoNo
In-app purchasesNoNo
MonetizationFree — betterPaid
Best chart rank#154 — better—
DevicesiPhone, iPadiPhone, iPod, Apple Watch — better
Requires iOS16.011.0 — better
Further details — not scored
Size7 MB1 MB
Age rating17+4+
DeveloperJacob Beniflah, MDDon Miller

Customer experience

BiliCalc

Written reviews58 reviews
Positive65.5%
Neutral13.8%
Negative20.7%

The OB Wheel Pro 7

All ratings5 ratings
Positive80.0%
Neutral0.0%
Negative20.0%
Written reviews17 reviews
Positive41.2%
Neutral17.6%
Negative41.2%

Bugs and requests

BiliCalc

Reported bugs

5 issues
  • Intermittently inaccurate plotting of bili values
  • Plots bili at lower than value entered
  • Graph is backwards (historical)
  • Instability misspelled (historical)
  • Graph errors when on phone call (historical)

Requested features

5 requests
  • Update to 2022 guidelines
  • Include transcutaneous measurements
  • Show hours since birth on graph
  • Plot more than one point on graph
  • Add dark mode option

The OB Wheel Pro 7

Not enough reviews yet to summarise bugs or requests.

In-app purchases

None

BiliCalc

No in-app purchases

None

The OB Wheel Pro 7

No in-app purchases

Questions

Is BiliCalc free?
BiliCalc costs $1.99, with no in-app purchases.
Is The OB Wheel Pro 7 free?
The OB Wheel Pro 7 costs $1.99, with no in-app purchases.
Do BiliCalc or The OB Wheel Pro 7 have ads?
Neither BiliCalc nor The OB Wheel Pro 7 shows ads.
Which is updated more often, BiliCalc or The OB Wheel Pro 7?
BiliCalc ships an update every 2 months, and The OB Wheel Pro 7 every 9 months. Most recently, BiliCalc was updated on November 1, 2026 and The OB Wheel Pro 7 on November 1, 2026.

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