# OB Calc (cloud) vs Obstetric Tools

The clearest difference is ads: OB Calc (cloud) at none against Obstetric Tools's shown. OB Calc (cloud) also leads on rating (5.0 vs 4.8). Obstetric Tools's advantage is update cadence (every 3 weeks vs every 3 months) and iOS requirement (15.1 vs 18.0). On price, ratings volume, in-app purchases and monetization model there is nothing between them.

Both are free to download. OB Calc (cloud) sells 2 in-app purchases, starting at $2.99 per month and Obstetric Tools sells 4 in-app purchases, starting at $1.99 per month. Whichever you choose, the download price is not the number that matters.

OB Calc (cloud) holds the better App Store score, 5.0 against 4.8. Both are backed by a comparable volume of ratings — 5 and 4 respectively.

OB Calc (cloud) ships an update every 3 months, Obstetric Tools every 3 weeks. The most recent releases landed on November 3, 2026 and October 30, 2026 respectively.

## The numbers

| Metric | OB Calc (cloud) | Obstetric Tools |
| --- | --- | --- |
| Price | Free | Free |
| Rating | **[5.0 (5 ratings)](https://appshunter.io/ios/app/ob-calc-cloud/id1495610465/reviews)** | [4.8 (4 ratings)](https://appshunter.io/ios/app/obstetric-tools-ob-calculator/id6742823689/reviews) |
| Number of ratings | **5** | 4 |
| Positive reviews | 0.0% of reviews | — |
| In-app purchases | Yes | Yes |
| Ads | **No** | Yes |
| Update frequency | Every 3 months | **Every 3 weeks** |
| Monetization | Free with in-app purchases | Free with in-app purchases |
| Size | 14 MB | 69 MB |
| Requires iOS | 18.0 | **15.1** |
| Devices | iPhone, iPad, Mac | iPhone, iPad, iPod |
| Age rating | 4+ | 17+ |
| Developer | [Glen Botha](https://appshunter.io/developer/943181947) | [Pedro Iniesta](https://appshunter.io/developer/1645524353) |

## What reviewers say

### OB Calc (cloud)

[App page](https://appshunter.io/ios/app/ob-calc-cloud/id1495610465)

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:** Vision Pro support

**In-app purchases (2)**

| Purchase | Price | Billing |
| --- | --- | --- |
| Monthly Subscription | $2.99 | per month |
| Premium (Annual) | $29.99 | per year |


### Obstetric Tools

[App page](https://appshunter.io/ios/app/obstetric-tools-ob-calculator/id6742823689)

This clinical toolkit provides obstetricians and midwives with a precise, fast, and comprehensive pregnancy wheel and calculator. It offers evidence-based results for optimizing patient care, even offline, and includes various essential medical tests and scales.

**Highlights:** Advanced Gestogram (Pregnancy Wheel), Estimated Due Date (EDD) & Gestational Age (GA) calculation, Estimated Fetal Weight (EFW) calculator, Maternal BMI & Weight Gain tracker, Bishop Score, Apgar Score, and other clinical scales, 100% Offline Functionality, Evidence-based clinical information

**Features:** macOS Compatibility, Vision Pro support

**In-app purchases (4)**

| Purchase | Price | Billing |
| --- | --- | --- |
| Premium Monthly | $1.99 | per month |
| Obstetric Tools Pro Monthly | $3.99 | per month |
| Premium Annual | $4.99 | per year |
| Obstetric Tools Pro Annual | $24.99 | per year |


## Frequently asked questions

### Is OB Calc (cloud) free?

OB Calc (cloud) is free to download, with in-app purchases available.

### Is Obstetric Tools free?

Obstetric Tools is free to download, with in-app purchases available.

### Which has better reviews, OB Calc (cloud) or Obstetric Tools?

OB Calc (cloud) is rated higher. OB Calc (cloud) averages 5.0 out of 5 from 5 ratings, while Obstetric Tools averages 4.8 from 4 ratings.

### Do OB Calc (cloud) or Obstetric Tools have ads?

Obstetric Tools shows ads; OB Calc (cloud) does not.

### Which is updated more often, OB Calc (cloud) or Obstetric Tools?

OB Calc (cloud) ships an update every 3 months, and Obstetric Tools every 3 weeks. Most recently, OB Calc (cloud) was updated on November 3, 2026 and Obstetric Tools on October 30, 2026.

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*Compared by [AppsHunter](https://appshunter.io/) from daily US App Store data. Review summaries are generated from verbatim App Store reviews.*