Comparison

OB Wheels vs OB Wheel

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

Head to head
About

OB Wheels

This app calculates due dates, gestational age, and reconciles sonogram and LMP dates using a digital OB wheel and calendar. It offers a familiar interactive wheel for precise date calculations, accounting for leap years.

Highlights
  • Calendar calculator for EDD/EDC
  • Gestational age calculation
  • Interactive digital OB wheel
  • Reconciliation of due dates
  • Leap year accuracy
Features
Read full description

Does the world need another OB-wheel-due-date-calculator app? You bet! OB Wheels combines three things that clinicians need to derive all the dates necessary in pregnancy care, and no other app has this combination. It contains a calendar calculator to determine EDD (EDC) from LMP or from a sonogram report. The calendar calculator also provides gestational age (EGA) as of any date for a given EDD or LMP. Because the calculator works off the real calendar, it is accurate for leap years too. Then for all of you who miss your cardboard OB wheel, the app contains one which you can rotate, pinch and zoom, and generally play with just like a regular cardboard wheel. It's a little tricky to learn how to plant two fingers and rotate them rather than pinch-and-zoom to get rotation versus resizing. But the wheel works and it is accurate, especially so because you can zoom in to be sure where the little date hash lines lie. Finally, the app notes the most recent committee opinion scheme from ACOG on how one might reconcile due dates from LMP and sonograms to arrive at a single final EDD. To my knowledge, the scheme is authority-based and no better or worse than other schemes, but my practice and my learners need a single clear scheme, so this app includes one for easy reference. As an educator and clinician myself, I am grateful for feedback. Email me via the contact email at my website.

About

OB Wheel

This app assists expectant mothers and healthcare professionals in tracking pregnancy with accurate due date calculations and weekly fetal development updates. It offers customizable features, health tips, and tools for clinicians to support patient care throughout the journey to delivery.

Highlights
  • Accurate due date calculation
  • Weekly fetal development tracker
  • Customizable reminders and tracking
  • Health tips and resources
  • Tools for healthcare professionals
  • Symptom and feeling logging
Features
Read full description

Promotional Text for OB Wheel App "Introducing the OB Wheel App – Your Personalized Pregnancy Journey Companion! Navigating through pregnancy just got easier and more reliable with the OB Wheel App, specially designed for expectant mothers and healthcare professionals. Say goodbye to guesswork and hello to precision with our user-friendly app that offers accurate, at-a-glance pregnancy tracking. Key Features: Accurate Due Date Calculation: Simply enter your last menstrual period, and let our app do the rest. Get precise due dates and important milestones at your fingertips. Fetal Development Tracker: Watch your baby's growth week-by-week. Learn about developmental stages, size comparisons, and exciting changes as your pregnancy progresses. Customizable Experience: Every pregnancy is unique. Customize the app to suit your journey – set reminders, track appointments, and record your feelings and symptoms. Health Tips & Resources: Stay informed with valuable insights, nutritional advice, and tips for maintaining a healthy pregnancy from conception to delivery. Professional Tools for Clinicians: A handy resource for obstetricians and midwives, offering gestational age calculations, weight and length estimations, and more to support patient care. Why Choose OB Wheel App? Simplicity and Ease of Use: Designed with you in mind, our app is intuitive and straightforward, making pregnancy tracking stress-free. Trusted and Reliable: Developed in collaboration with healthcare professionals, ensuring accuracy and up-to-date information. Stay Connected: Share milestones with loved ones and keep your healthcare team in the loop with easy sharing options. Embrace the beauty of pregnancy and enjoy peace of mind with the OB Wheel App. Whether you're a first-time mom or a seasoned pro, our app will be by your side every step of the way. Download now and start your extraordinary journey to motherhood with confidence and joy! Privacy policy: https://odindevstudio.wordpress.com/privacy-policy Terms of use and Terms of Subscription https://odindevstudio.wordpress.com/terms

Screenshots

OB Wheels4 screens
OB Wheel4 screens

Verdict

The call

The clearest difference is rating: OB Wheel at 4.3 against OB Wheels's 2.3. OB Wheel also leads on update cadence (every 4 days vs every 18 months). OB Wheels's advantage is in-app purchases (none vs 2) and iOS requirement (7.0 vs 14.0). On price, ratings volume, ads and monetization model 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. OB Wheel sells 2 one-off in-app purchases. OB Wheels asks for nothing beyond the download.

ReceptionRating · Positive reviews · Number of ratings

OB Wheel holds the better App Store score, 4.3 against 2.3. Both are backed by a comparable volume of ratings — 15 and 10 respectively.

UpkeepUpdate frequency

OB Wheels ships an update every 18 months, OB Wheel every 4 days. The most recent releases landed on October 26, 2026 and October 22, 2026 respectively.

Scorecard4 real differences · 6 level
OB Wheels versus OB Wheel: the parameters behind the verdict, then further details
ParameterOB WheelsOB Wheel
PriceFreeFree
Rating2.3 (15 ratings)4.3 (10 ratings) — better
Positive reviews20.0% of reviews—
Number of ratings15 — better10
Update frequencyEvery 18 monthsEvery 4 days — better
AdsNoNo
In-app purchasesNo — betterYes
MonetizationFreeFree
DevicesiPhone, iPodiPhone, iPod
Requires iOS7.0 — better14.0
Further details — not scored
Size3 MB28 MB
Age rating17+17+
DeveloperJoshua D. steinbergBerkay Gurcesme

Customer experience

OB Wheels

All ratings15 ratings
Positive20.0%
Neutral13.3%
Negative66.7%
Written reviews10 reviews
Positive20.0%
Neutral10.0%
Negative70.0%

OB Wheel

All ratings10 ratings
Positive80.0%
Neutral10.0%
Negative10.0%

In-app purchases

None

OB Wheels

No in-app purchases

2 purchases

OB Wheel

One-time2
  • Ob Wheel lifetime ad-free$3.99
  • Unlimited Ad-free Ob wheel$9.99

Questions

Is OB Wheels free?
OB Wheels is free to download, with no in-app purchases.
Is OB Wheel free?
OB Wheel is free to download, with in-app purchases available.
Which has better reviews, OB Wheels or OB Wheel?
OB Wheel is rated higher. OB Wheels averages 2.3 out of 5 from 15 ratings, while OB Wheel averages 4.3 from 10 ratings.
Do OB Wheels or OB Wheel have ads?
Neither OB Wheels nor OB Wheel shows ads.
Which is updated more often, OB Wheels or OB Wheel?
OB Wheels ships an update every 18 months, and OB Wheel every 4 days. Most recently, OB Wheels was updated on October 26, 2026 and OB Wheel on October 22, 2026.

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