# OB ToolBox vs Obstetrum

The clearest difference is in-app purchases: OB ToolBox at none against Obstetrum's 2. OB ToolBox also leads on ads (none vs shown) and iOS requirement (13.0 vs 15.0). Obstetrum's advantage is update cadence (daily vs every 3 weeks). On price and device support there is nothing between them.

Both are free to download. Obstetrum sells 2 in-app purchases, starting at $2.99 per month. OB ToolBox asks for nothing beyond the download.

OB ToolBox ships an update every 3 weeks, Obstetrum daily. The most recent releases landed on November 3, 2026 and October 31, 2026 respectively.

## The numbers

| Metric | OB ToolBox | Obstetrum |
| --- | --- | --- |
| Price | Free | Free |
| Rating | **[5.0 (2 ratings)](https://appshunter.io/ios/app/ob-toolbox/id1565667366/reviews)** | — |
| Number of ratings | **2** | — |
| In-app purchases | **No** | Yes |
| Ads | **No** | Yes |
| Update frequency | Every 3 weeks | **Daily** |
| Monetization | Free | — |
| Size | 56 MB | 42 MB |
| Requires iOS | **13.0** | 15.0 |
| Devices | iPhone, iPad, iPod | iPhone, iPad, iPod |
| Age rating | 12+ | +17 |
| Developer | [Frederick Blair](https://appshunter.io/developer/1565667368) | [Leonel Pimentel](https://appshunter.io/developer/1847101134) |

## What reviewers say

### OB ToolBox

[App page](https://appshunter.io/ios/app/ob-toolbox/id1565667366)

This app offers a quick reference for essential medical values related to fetal growth, amniotic fluid, and Doppler indices. It includes calculators for preterm birth prediction, cesarean risk, and risk of stillbirth or miscarriage.

**Highlights:** Fetal growth reference values, Estimated fetal weight calculator, Amniotic fluid and Doppler indices, Bishop score reference, Preterm birth predictor, Cesarean risk calculator, Stillbirth and miscarriage risk calculators

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

**In-app purchases:** none


### Obstetrum

[App page](https://appshunter.io/ios/app/obstetrum-ob-gyn-calculator/id6761284412)

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

**In-app purchases (2)**

| Purchase | Price | Billing |
| --- | --- | --- |
| Obstetrum Premium | $2.99 | per month |
| Obstetrum Premium | $24.99 | per year |


## Frequently asked questions

### Is OB ToolBox free?

OB ToolBox is free to download, with no in-app purchases.

### Is Obstetrum free?

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

### Do OB ToolBox or Obstetrum have ads?

Obstetrum shows ads; OB ToolBox does not.

### Which is updated more often, OB ToolBox or Obstetrum?

OB ToolBox ships an update every 3 weeks, and Obstetrum daily. Most recently, OB ToolBox was updated on November 3, 2026 and Obstetrum on October 31, 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.*