# PPI Calc vs Retinal

The clearest difference is device support: PPI Calc at 3 against Retinal's 1. PPI Calc also leads on iOS requirement (7.0 vs 17.0). On price, ads and in-app purchases 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 | PPI Calc | Retinal |
| --- | --- | --- |
| Price | Free | Free |
| Rating | **[4.4 (13 ratings)](https://appshunter.io/ios/app/ppi-calc-ppi-calculator/id898198587/reviews)** | — |
| Number of ratings | **13** | — |
| Positive reviews | 71.4% of reviews | — |
| In-app purchases | No | No |
| Ads | No | No |
| Update frequency | — | Fortnightly |
| Monetization | Free | — |
| Size | 1 MB | 1 MB |
| Requires iOS | **7.0** | 17.0 |
| Devices | **iPhone, iPad, iPod** | iPhone |
| Age rating | 4+ | 4+ |
| Developer | [Fausto Ristagno](https://appshunter.io/developer/482102205) | [Nico Rohrbach](https://appshunter.io/developer/662717596) |

## What reviewers say

### PPI Calc

[App page](https://appshunter.io/ios/app/ppi-calc-ppi-calculator/id898198587)

Calculate pixels per inch (PPI) for any screen, along with aspect ratio and screen measurements. View data in inches or centimeters. Includes presets for standard resolutions and common devices.

**Highlights:** PPI calculation, Aspect ratio display, Screen height and width, Screen area calculation, Inch and centimeter units, Standard resolution presets, Common device presets

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

**In-app purchases:** none


### Retinal

[App page](https://appshunter.io/ios/app/retinal/id1564557619)

**Features:** macOS Compatibility

**In-app purchases:** none


## Frequently asked questions

### Is PPI Calc free?

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

### Is Retinal free?

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

### Do PPI Calc or Retinal have ads?

Neither PPI Calc nor Retinal 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.*