Comparison

Perinatal Calculators 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

Perinatal Calculators

This app provides essential obstetrical and perinatal calculators for healthcare providers. It aids in patient counseling with tools for assessing risks like extreme prematurity and Down Syndrome, and managing conditions like gestational diabetes. All calculations are performed locally without an internet connection.

Highlights
  • Extreme prematurity calculator
  • VBAC success calculators
  • Down Syndrome risk assessment
  • Gestational diabetes insulin calculation
  • CCAMs CVR calculator
  • Offline functionality
Features
Read full description

Perinatal and obstetrical calculators derived from published data to help guide obstetrical providers in counseling patients. Calculators include: -Extreme prematurity calculator for fetuses 22-25 weeks gestational age -VBAC success calculator based on information available for counseling in the office setting -VBAC success calculator based on factors on admission including cervical exam -Assessment of risk of having a child with Down Syndrome -Insulin calculation for initiating insulin in a gestational diabetic -CVR calculator for CCAMs -MCA doppler MOM calculator -Umbilical artery doppler reference range calculator -Preterm VBAC calculator -Insulin adjustment for corticosteroids calculator DOES NOT REQUIRE INTERNET CONNECTION to use, all done locally on iPhone or iPad

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

Perinatal Calculators3 screens
OB Calc (cloud)4 screens

Verdict

The call

The clearest difference is in-app purchases: Perinatal Calculators at none against OB Calc (cloud)'s 2. Perinatal Calculators also leads on update cadence (monthly vs every 3 months) and iOS requirement (15.6 vs 18.0). On price, rating, ratings volume and ads 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. Perinatal Calculators asks for nothing beyond the download.

ReceptionRating · Positive reviews · Number of ratings

On the App Store both sit at effectively the same score — 5.0 for Perinatal Calculators against 5.0 for OB Calc (cloud). Both are backed by a comparable volume of ratings — 2 and 5 respectively.

UpkeepUpdate frequency

Perinatal Calculators ships an update monthly, OB Calc (cloud) every 3 months. The most recent releases landed on September 24, 2026 and October 25, 2026 respectively.

Scorecard4 real differences · 6 level
Perinatal Calculators versus OB Calc (cloud): the parameters behind the verdict, then further details
ParameterPerinatal CalculatorsOB Calc (cloud)
PriceFreeFree
Rating5.0 (2 ratings)5.0 (5 ratings)
Positive reviews—0.0% of reviews
Number of ratings25 — better
Update frequencyMonthly — betterEvery 3 months
AdsNoNo
In-app purchasesNo — betterYes
MonetizationFree — betterFree with in-app purchases
DevicesiPhone, iPad, iPodiPhone, iPad, Mac
Requires iOS15.6 — better18.0
Further details — not scored
Size2 MB14 MB
Age rating4+4+
DeveloperDavid DeschampsGlen Botha

Customer experience

Perinatal Calculators

All ratings2 ratings
Positive100.0%
Neutral0.0%
Negative0.0%

OB Calc (cloud)

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

In-app purchases

None

Perinatal Calculators

No in-app purchases

2 purchases

OB Calc (cloud)

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

Questions

Is Perinatal Calculators free?
Perinatal Calculators 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, Perinatal Calculators or OB Calc (cloud)?
Perinatal Calculators and OB Calc (cloud) are both rated 5.0 out of 5 on the App Store, from 2 and 5 ratings respectively.
Do Perinatal Calculators or OB Calc (cloud) have ads?
Neither Perinatal Calculators nor OB Calc (cloud) shows ads.
Which is updated more often, Perinatal Calculators or OB Calc (cloud)?
Perinatal Calculators ships an update monthly, and OB Calc (cloud) every 3 months. Most recently, Perinatal Calculators was updated on September 24, 2026 and OB Calc (cloud) on October 25, 2026.

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