# Radiology vs OB ToolBox

The clearest difference is price: OB ToolBox at Free against Radiology's $19.99. OB ToolBox also leads on update cadence (every 3 weeks vs every 7 months). On ads, in-app purchases, device support and iOS requirement there is nothing between them.

OB ToolBox is free to download; Radiology costs $19.99 up front. Neither carries in-app purchases, so what you see is what you pay.

Radiology ships an update every 7 months, OB ToolBox every 3 weeks. The most recent releases landed on August 26, 2026 and July 20, 2026 respectively.

## The numbers

| Metric | Radiology | OB ToolBox |
| --- | --- | --- |
| Price | $19.99 | **Free** |
| In-app purchases | No | No |
| Ads | No | No |
| Update frequency | Every 7 months | **Every 3 weeks** |
| Monetization | — | Free |
| Size | 451 MB | 56 MB |
| Requires iOS | **12.0** | 13.0 |
| Devices | iPhone, iPad, iPod | iPhone, iPad, iPod |
| Age rating | 4+ | 12+ |
| Developer | [BestApps BV](https://appshunter.io/developer/329677410) | [Frederick Blair](https://appshunter.io/developer/1565667368) |

## What reviewers say

### Radiology

[App page](https://appshunter.io/ios/app/radiology-aortic-imaging/id1090384392)

**In-app purchases:** none


### 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

**In-app purchases:** none


## Frequently asked questions

### Is Radiology free?

Radiology costs $19.99, with no in-app purchases.

### Is OB ToolBox free?

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

### Do Radiology or OB ToolBox have ads?

Neither Radiology nor OB ToolBox shows ads.

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

Radiology ships an update every 7 months, and OB ToolBox every 3 weeks. Most recently, Radiology was updated on August 26, 2026 and OB ToolBox on July 20, 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.*