# OR vs Power & Sample Size

The clearest difference is iOS requirement: OR at 12.0 against Power & Sample Size's 15.6. On price, rating, ratings volume and ads there is nothing between them.

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

On the App Store both sit at effectively the same score — 5.0 for OR against 5.0 for Power & Sample Size. Both are backed by a comparable volume of ratings — 2 and 1 respectively.

## The numbers

| Metric | OR | Power & Sample Size |
| --- | --- | --- |
| Price | Free | Free |
| Rating | [5.0 (2 ratings)](https://appshunter.io/ios/app/or-stencil/id1440668366/reviews) | [5.0 (1 ratings)](https://appshunter.io/ios/app/power-and-sample-size/id6802436519/reviews) |
| Number of ratings | **2** | 1 |
| In-app purchases | No | No |
| Ads | No | No |
| Monetization | Free | — |
| Size | 24 MB | 0 MB |
| Requires iOS | **12.0** | 15.6 |
| Devices | **iPhone, iPad, iPod** | iPhone, iPod |
| Age rating | 4+ | 4+ |
| Developer | [University of California, Irvine](https://appshunter.io/developer/643200027) | [Mario ROEDERER](https://appshunter.io/developer/6795195521) |

## What reviewers say

### OR

[App page](https://appshunter.io/ios/app/or-stencil/id1440668366)

This surgical planning tool allows plastic and reconstructive surgeons to map out local flap surgeries. It helps users learn about flap dynamics and plot Relaxed Skin Tension Lines on any human face.

**Highlights:** Surgical planning for local flaps, Learn about flap dynamics, Plot Relaxed Skin Tension Lines (RSTL), Designed by surgeons, User-friendly interface

**Features:** macOS Compatibility

**In-app purchases:** none


### Power & Sample Size

[App page](https://appshunter.io/ios/app/power-and-sample-size/id6802436519)

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

**In-app purchases:** none


## Frequently asked questions

### Is OR free?

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

### Is Power & Sample Size free?

Power & Sample Size is free to download, with no in-app purchases.

### Which has better reviews, OR or Power & Sample Size?

OR and Power & Sample Size are both rated 5.0 out of 5 on the App Store, from 2 and 1 ratings respectively.

### Do OR or Power & Sample Size have ads?

Neither OR nor Power & Sample Size shows ads.

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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.*