# Multiplier vs Doc Duty

The clearest difference is update cadence: Doc Duty at every 3 weeks against Multiplier's every 6 months. Multiplier's advantage is iOS requirement (13.0 vs 15.1). 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.

Multiplier ships an update every 6 months, Doc Duty every 3 weeks. The most recent releases landed on October 23, 2026 and October 25, 2026 respectively.

## The numbers

| Metric | Multiplier | Doc Duty |
| --- | --- | --- |
| Price | Free | Free |
| Rating | **[4.6 (24 ratings)](https://appshunter.io/ios/app/multiplier/id460335161/reviews)** | — |
| Number of ratings | **24** | — |
| Positive reviews | 83.3% of reviews | — |
| In-app purchases | No | No |
| Ads | No | No |
| Update frequency | Every 6 months | **Every 3 weeks** |
| Monetization | Paid | — |
| Size | 62 MB | 36 MB |
| Requires iOS | **13.0** | 15.1 |
| Devices | iPhone, iPad, iPod | iPhone, iPad, iPod |
| Age rating | 12+ | 4+ |
| Developer | [LifeBridge Health](https://appshunter.io/developer/460335164) | [GILBERTO ZINN SCHUTZ FILHO](https://appshunter.io/developer/1637909096) |

## What reviewers say

### Multiplier

[App page](https://appshunter.io/ios/app/multiplier/id460335161)

This app automates complex calculations for predicting mature height, bone length, and limb length discrepancies in children. It simplifies manual methods, reducing calculation time and errors for various orthopedic and growth-related assessments.

**Highlights:** Predict mature height, Calculate bone length, Assess limb length discrepancy, Analyze growth remaining, Plot height on CDC charts, Scanogram calculations, Foot length analysis

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

**In-app purchases:** none


### Doc Duty

[App page](https://appshunter.io/ios/app/doc-duty/id1637998342)

**Features:** macOS Compatibility

**In-app purchases:** none


## Frequently asked questions

### Is Multiplier free?

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

### Is Doc Duty free?

Doc Duty is free to download, with no in-app purchases.

### Do Multiplier or Doc Duty have ads?

Neither Multiplier nor Doc Duty shows ads.

### Which is updated more often, Multiplier or Doc Duty?

Multiplier ships an update every 6 months, and Doc Duty every 3 weeks. Most recently, Multiplier was updated on October 23, 2026 and Doc Duty on October 25, 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.*