# Pixel Density Calculator vs BAP String Building Guide

The clearest difference is price: BAP String Building Guide at Free against Pixel Density Calculator's $2.99. BAP String Building Guide also leads on update cadence (every 2 months vs every 38 months). Pixel Density Calculator's advantage is iOS requirement (13 vs 18.5). On ads, in-app purchases and device support there is nothing between them.

BAP String Building Guide is free to download; Pixel Density Calculator costs $2.99 up front. Neither carries in-app purchases, so what you see is what you pay.

Pixel Density Calculator ships an update every 38 months, BAP String Building Guide every 2 months. The most recent releases landed on September 26, 2026 and September 30, 2026 respectively.

## The numbers

| Metric | Pixel Density Calculator | BAP String Building Guide |
| --- | --- | --- |
| Price | $2.99 | **Free** |
| Rating | **[5.0 (1 ratings)](https://appshunter.io/ios/app/pixel-density-calculator/id6444243922/reviews)** | — |
| Number of ratings | **1** | — |
| In-app purchases | No | No |
| Ads | No | No |
| Update frequency | Every 38 months | **Every 2 months** |
| Monetization | Paid | — |
| Size | 3 MB | 6 MB |
| Requires iOS | **13** | 18.5 |
| Devices | **iPhone, iPad, iPod** | iPhone, iPad |
| Age rating | 4+ | 4+ |
| Developer | [Heng Jia Liang](https://appshunter.io/developer/1532000635) | [Lucas Palmer](https://appshunter.io/developer/1747342861) |

## What reviewers say

### Pixel Density Calculator

[App page](https://appshunter.io/ios/app/pixel-density-calculator/id6444243922)

Calculate the pixels per inch (PPI) or dots per inch (DPI) for any display. This tool helps determine screen resolution based on dimensions and pixel count, also calculating screen size, aspect ratio, and megapixels.

**Highlights:** Calculate Pixels Per Inch (PPI), Calculate Dots Per Inch (DPI), Determine screen size, Calculate aspect ratio, Megapixel count calculation, Shape preview

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

**In-app purchases:** none


### BAP String Building Guide

[App page](https://appshunter.io/ios/app/bap-string-building-guide/id6748029900)

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

**In-app purchases:** none


## Frequently asked questions

### Is Pixel Density Calculator free?

Pixel Density Calculator costs $2.99, with no in-app purchases.

### Is BAP String Building Guide free?

BAP String Building Guide is free to download, with no in-app purchases.

### Do Pixel Density Calculator or BAP String Building Guide have ads?

Neither Pixel Density Calculator nor BAP String Building Guide shows ads.

### Which is updated more often, Pixel Density Calculator or BAP String Building Guide?

Pixel Density Calculator ships an update every 38 months, and BAP String Building Guide every 2 months. Most recently, Pixel Density Calculator was updated on September 26, 2026 and BAP String Building Guide on September 30, 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.*