# OB ToolBox vs QBL Calculator

The clearest difference is iOS requirement: OB ToolBox at 13.0 against QBL Calculator's 17.0. On price, ads, in-app purchases and device support there is nothing between them.

Both are free to download. Neither carries in-app purchases, so what you see is what you pay.

## The numbers

| Metric | OB ToolBox | QBL Calculator |
| --- | --- | --- |
| 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 | No |
| Ads | No | No |
| Update frequency | Every 3 weeks | — |
| Monetization | Free | — |
| Size | 56 MB | 1 MB |
| Requires iOS | **13.0** | 17.0 |
| Devices | **iPhone, iPad, iPod** | iPhone, iPad |
| Age rating | 12+ | 17+ |
| Developer | [Frederick Blair](https://appshunter.io/developer/1565667368) | [Kinan Sawar](https://appshunter.io/developer/1880585294) |

## 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


### QBL Calculator

[App page](https://appshunter.io/ios/app/qbl-calculator/id6783582039)

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

**In-app purchases:** none


## Frequently asked questions

### Is OB ToolBox free?

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

### Is QBL Calculator free?

QBL Calculator is free to download, with no in-app purchases.

### Do OB ToolBox or QBL Calculator have ads?

Neither OB ToolBox nor QBL Calculator shows ads.

---

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