Comparison

Preg Wheel vs OB Calc (cloud)

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

Head to head
About

Preg Wheel

This app provides a digital pregnancy wheel for iPhone users, eliminating the need for a physical one. It allows for quick input of key dates and offers accurate results, accounting for calendar variations. The app also saves your information for future use and includes important dates for screenings throughout the pregnancy.

Highlights
  • Input LMP, EDD, EGA, and IVF dates
  • Accurate date calculations with leap year support
  • Save and restore input dates
  • Track important screening test dates
  • View dates for 1st Trimester US, CVS, Quad Screen, and more
Features
Read full description

Simple and fast pregnancy wheel available for the iPhone, No need to carry a paper wheel. The best part is the app is completely free. Features ------------------------------- 1) Quickly input various dates with the date wheel: • Last menstrual period (LMP) • Estimated date of delivery (EDD) • Estimated Gestational Age (EGA) • IVF dates 2) Accurate results: Preg Wheel provides exact dates and accounts for all calendar variance, including leap years. 3) Persistence: Preg Wheel can save the date and date type and restore them when launched to streamline your workflow. 4) Now with even more relevant dates for the entire pregnancy. Know in advance when specific screening tests need to be performed. • 1st Trimesters US • CVS • Quad Screen • Amino • Anatomy US • GTT • Anti-D Prophylaxis • GBS Screen • Elective Delivery

About

OB Calc (cloud)

This medical app helps obstetricians efficiently calculate key patient test date windows. It offers multiple calculation methods and allows for saving patient data and generating PDF reports. A free trial is available, followed by a subscription for full access.

Highlights
  • LMP, EDC, Ultrasound, CRL, and IVF calculations
  • Customizable test date ranges
  • Cross-device data syncing
  • PDF report generation
  • Save individual patient data
Features
Read full description

While similar to a pregnancy wheel, OB Calc (cloud) is specifically designed by an obstetrician, for obstetricians. Finally obstetricians have an efficient and simple method to calculate the important test date windows for patients. CALCULATION METHODS • Last Menstrual Period (LMP) • Expected Delivery Date (EDC) • Sonogram Date and Fetal Age (Sonogram) • Crown Rump Length (CRL) • In Vitro Fertilization (IVF) Try the app for free for 7 days. A low monthly autorenewable subscription gives users access to premium features such as all calculation methods and saving of individual patient data. You can reach the developer directly at support@inpocketsolutions.com FEATURES • LMP, EDC, Ultrasound, CRL and IVF Method Calculations • Customize up to 15 tests, with date ranges • Data synced across multiple devices • Generate a PDF file • Save individual patient data CRL data reference : https://obgyn.onlinelibrary.wiley.com/doi/pdf/10.1002/uog.7654 Terms & Conditions: https://inpocketsolutions.com/terms ** Disclaimer Remember to test out the app on your specific device to ensure calculations are verified to your expectation.

Screenshots

Preg Wheel4 screens
OB Calc (cloud)4 screens

Verdict

The call

The clearest difference is review sentiment: Preg Wheel at 59% against OB Calc (cloud)'s 0%. Preg Wheel also leads on in-app purchases (none vs 2) and ratings volume (62 vs 5). OB Calc (cloud)'s advantage is rating (5.0 vs 4.0) and update cadence (every 3 months vs every 9 months). On price, ads 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. OB Calc (cloud) sells 2 in-app purchases, starting at $2.99 per month. Preg Wheel asks for nothing beyond the download.

ReceptionRating · Positive reviews · Number of ratings

OB Calc (cloud) holds the better App Store score, 5.0 against 4.0. That said, the two scores are not equally well evidenced: Preg Wheel has 62 ratings behind it against 5, so its average is the more settled of the two. Written reviews complicate that: 59% of Preg Wheel's written reviews are positive against 0% of OB Calc (cloud)'s, so the app with the better star average is not the one people write more warmly about.

UpkeepUpdate frequency

Preg Wheel ships an update every 9 months, OB Calc (cloud) every 3 months. The most recent releases landed on October 15, 2026 and October 8, 2026 respectively.

Scorecard7 real differences · 3 level
Preg Wheel versus OB Calc (cloud): the parameters behind the verdict, then further details
ParameterPreg WheelOB Calc (cloud)
PriceFreeFree
Rating4.0 (62 ratings)5.0 (5 ratings) — better
Positive reviews58.6% of reviews — better0.0% of reviews
Number of ratings62 — better5
Update frequencyEvery 9 monthsEvery 3 months — better
AdsNoNo
In-app purchasesNo — betterYes
MonetizationFree — betterFree with in-app purchases
DevicesiPhone, iPad, iPodiPhone, iPad, Mac
Requires iOS10.0 — better18.0
Further details — not scored
Size24 MB14 MB
Age rating17+4+
DeveloperAndrew YuGlen Botha

Customer experience

Preg Wheel

All ratings62 ratings
Positive72.6%
Neutral4.8%
Negative22.6%
Written reviews58 reviews
Positive58.6%
Neutral1.7%
Negative39.7%

OB Calc (cloud)

All ratings5 ratings
Positive100.0%
Neutral0.0%
Negative0.0%
Written reviews1 reviews
Positive0.0%
Neutral0.0%
Negative100.0%

Bugs and requests

Preg Wheel

Reported bugs

13 issues
  • IVF dating function does not work
  • Cannot calculate due date based on weeks and ultrasound date
  • LMP does not change when due date is entered, and vice versa
  • App not compatible with iOS 14
  • App not compatible with iOS 11
Show 8 more
  • App not compatible with iOS 7
  • App not working after iPhone updates
  • App crashes or shuts down
  • Gestational weeks are wrong
  • All numbers came up wrong
  • Does not work on iPad anymore
  • Freezes phone
  • Instant shutdown

Requested features

5 requests
  • Update for latest iOS
  • Update IVF dating function
  • Add FTS window
  • Ensure compatibility with newer devices/OS
  • Local time zone support

OB Calc (cloud)

Not enough reviews yet to summarise bugs or requests.

In-app purchases

None

Preg Wheel

No in-app purchases

2 purchases

OB Calc (cloud)

Subscriptions2
  • Monthly Subscription$2.991 Month
  • Premium (Annual)$29.991 Year

Questions

Is Preg Wheel free?
Preg Wheel is free to download, with no in-app purchases.
Is OB Calc (cloud) free?
OB Calc (cloud) is free to download, with in-app purchases available.
Which has better reviews, Preg Wheel or OB Calc (cloud)?
OB Calc (cloud) is rated higher. Preg Wheel averages 4.0 out of 5 from 62 ratings, while OB Calc (cloud) averages 5.0 from 5 ratings.
Do Preg Wheel or OB Calc (cloud) have ads?
Neither Preg Wheel nor OB Calc (cloud) shows ads.
Which is updated more often, Preg Wheel or OB Calc (cloud)?
Preg Wheel ships an update every 9 months, and OB Calc (cloud) every 3 months. Most recently, Preg Wheel was updated on October 15, 2026 and OB Calc (cloud) on October 8, 2026.

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