# OB Calc (cloud) vs Storc

The clearest difference is update cadence: Storc at every 4 weeks against OB Calc (cloud)'s every 3 months. Storc also leads on iOS requirement (15.1 vs 18.0). On price, ads, in-app purchases and device support 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 Storc sells 2 in-app purchases, starting at $2.99 per month. Whichever you choose, the download price is not the number that matters.

OB Calc (cloud) ships an update every 3 months, Storc every 4 weeks. The most recent releases landed on September 21, 2026 and September 11, 2026 respectively.

## The numbers

| Metric | OB Calc (cloud) | Storc |
| --- | --- | --- |
| Price | Free | Free |
| Rating | **[5.0 (5 ratings)](https://appshunter.io/ios/app/ob-calc-cloud/id1495610465/reviews)** | — |
| Number of ratings | **5** | — |
| Positive reviews | 0.0% of reviews | — |
| In-app purchases | Yes | Yes |
| Ads | No | No |
| Update frequency | Every 3 months | **Every 4 weeks** |
| Monetization | Free with in-app purchases | — |
| Size | 14 MB | 38 MB |
| Requires iOS | 18.0 | **15.1** |
| Devices | **iPhone, iPad, Mac** | iPhone, iPod |
| Age rating | 4+ | 4+ |
| Developer | [Glen Botha](https://appshunter.io/developer/943181947) | [Yuliyan Stefanov](https://appshunter.io/developer/1649056707) |

## 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 |


### Storc

[App page](https://appshunter.io/ios/app/storc-ob-patient-tracker/id6443752821)

**Features:** macOS Compatibility

**In-app purchases (2)**

| Purchase | Price | Billing |
| --- | --- | --- |
| Standard monthly | $2.99 | per month |
| Standard annually | $29.99 | per year |


## Frequently asked questions

### Is OB Calc (cloud) free?

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

### Is Storc free?

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

### Do OB Calc (cloud) or Storc have ads?

Neither OB Calc (cloud) nor Storc shows ads.

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

OB Calc (cloud) ships an update every 3 months, and Storc every 4 weeks. Most recently, OB Calc (cloud) was updated on September 21, 2026 and Storc on September 11, 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.*