OB Calc (cloud) vs Simple Pregnancy Wheel
Price, ratings, monetisation and update history for both apps, side by side — with what reviewers say about each.
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.
- LMP, EDC, Ultrasound, CRL, and IVF calculations
- Customizable test date ranges
- Cross-device data syncing
- PDF report generation
- Save individual patient data
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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.
Simple Pregnancy Wheel
Easily calculate gestational age and due dates based on your last menstrual period or due date. This app provides simple, straightforward tools for pregnancy tracking.
- Calculate gestational age
- Determine due date
- Track pregnancy dates
- Simple interface
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Know the Due Date? - Find out the current gestational age Know the First Day of Last Menstrual Period? - Find out the gestational age according to birthday Know the Birthday and Gestational Age - Find out what was the due date It is all right here--it is all simple!
Screenshots
Verdict
The clearest difference is review sentiment: Simple Pregnancy Wheel at 100% against OB Calc (cloud)'s 0%. Simple Pregnancy Wheel also leads on in-app purchases (none vs 2) and ratings volume (127 vs 5). OB Calc (cloud)'s advantage is rating (5.0 vs 4.7). On price, update cadence, 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
Both are free to download. OB Calc (cloud) sells 2 in-app purchases, starting at $2.99 per month. Simple Pregnancy Wheel asks for nothing beyond the download.
OB Calc (cloud) holds the better App Store score, 5.0 against 4.7. That said, the two scores are not equally well evidenced: Simple Pregnancy Wheel has 127 ratings behind it against 5, so its average is the more settled of the two. Written reviews complicate that: 0% of OB Calc (cloud)'s written reviews are positive against 100% of Simple Pregnancy Wheel's, so the app with the better star average is not the one people write more warmly about.
OB Calc (cloud) ships an update every 3 months, Simple Pregnancy Wheel every 6 months. Both last shipped on November 11, 2026.
| Parameter | OB Calc (cloud) | Simple Pregnancy Wheel |
|---|---|---|
| Price | Free | Free |
| Rating | 5.0 (5 ratings) — better | 4.7 (127 ratings) |
| Positive reviews | 0.0% of reviews | 100.0% of reviews — better |
| Number of ratings | 5 | 127 — better |
| Update frequency | Every 3 months — better | Every 6 months |
| Ads | No | No |
| In-app purchases | Yes | No — better |
| Monetization | Free with in-app purchases | Free — better |
| Devices | iPhone, iPad, Mac — better | iPhone, iPod |
| Requires iOS | 18.0 | 12.1 — better |
| Further details — not scored | ||
| Size | 14 MB | 4 MB |
| Age rating | 4+ | 12+ |
| Developer | Glen Botha | David Patton |
Customer experience
OB Calc (cloud)
Simple Pregnancy Wheel
In-app purchases
OB Calc (cloud)
- Monthly Subscription$2.991 Month
- Premium (Annual)$29.991 Year
Simple Pregnancy Wheel
No in-app purchases
Questions
Is OB Calc (cloud) free?
Is Simple Pregnancy Wheel free?
Which has better reviews, OB Calc (cloud) or Simple Pregnancy Wheel?
Do OB Calc (cloud) or Simple Pregnancy Wheel have ads?
Which is updated more often, OB Calc (cloud) or Simple Pregnancy Wheel?
Other comparisons
