# PPI Guru — Calc PPI Easily

> Utility to calculate display's Pixels Per Inch (PPI) for various devices. (iPhone/iPad app by 基伟 徐.)

- Source: https://appshunter.io/ios/app/ppi-guru/id1514324923 (this page in markdown: same URL + `.md`)
- Developer: [基伟 徐](https://appshunter.io/developer/391905315)
- Category: Utilities, Productivity
- Price: Free
- Rating: 3.40/5 from 7 App Store ratings · 4 written reviews indexed
- Age rating: 4+
- Requires: iOS 15.0 · 2 MB
- Languages: Vietnamese, American English, European Spanish, Malay, Brazilian Portuguese, Thai, Tamil, Chinese (Traditional, Taiwan), Chinese (Simplified, China), Japanese
- Released: 2020-05-20
- Data updated: 2026-11-13
- Monetization: free
- User reviews in markdown: https://appshunter.io/ios/app/ppi-guru/id1514324923/reviews.md

## What is PPI Guru?

PPI Guru is a utility to calculate a display's PPI (Pixels Per Inch) for phones, tablets, laptops, monitors and TVs.

To calculate the PPI of a display, just enter the screen width and height in pixels and the diagonal size in inches. The PPI is calculated automatically, and PPI Guru indicates whether the display is a Retina Display (size 10″ or larger with PPI of 200 or more, or size under 10″ with PPI of 300 or more).

Key Features:
• Calculating PPI automatically, with Retina Display indicator
• Starts with your own device's screen already filled in
• Aspect ratio, dot pitch, physical size and total pixels
• Retina distance and pixels per degree at your viewing distance
• Subpixel layouts: RGB stripe, Diamond Pentile, RG-BG Pentile, Delta and RGBW, illustrated, with effective PPI
• Reverse calculation: enter a PPI to get the diagonal size
• Compare two displays side by side, drawn to scale
• Built-in offline library of about 250 devices: every iPhone, iPad and Mac, Apple displays, plus Samsung, Google, OnePlus, Xiaomi, monitors, TVs and handhelds
• Search device information from the internet
• Save device information for later reference
• English, Simplified Chinese, Traditional Chinese and Japanese

For devices on sale, you can just enter the device name and tap Search: PPI Guru looks it up in the built-in library first, then on the web, and fills in the display's information.
PS. Online search may not return accurate information, and it depends on network access to the search engine. Effective PPI figures for OLED layouts are approximations.
Device information is saved locally for further reference.

## Key features

- Automatic PPI calculation
- Search device information online
- Retina Display indicator
- Save device information locally
- Supports phones, tablets, laptops, and monitors

## Is PPI Guru safe?

Not enough ratings yet to assess PPI Guru.

## Is PPI Guru legit?

PPI Guru appears to be a legitimate app. The AppsHunter Legitimacy Score for PPI Guru is 90 out of 100 points across 7 verification signals from App Store and developer data.

## Recent user reviews (4 of 4)

All indexed reviews: https://appshunter.io/ios/app/ppi-guru/id1514324923/reviews.md

### 5/5 — iPhone 11

*2026-11-08*

10

### 4/5 — Aura

*2026-07-23*

Muito bommm pra ff to dando só lata

### 5/5 — So caspa

*2026-07-06*

É mt bom para dar caspa

### 2/5 — Mais ou menos

*2026-06-28*

Não gostei muito

## Frequently asked questions about PPI Guru

### How do I calculate PPI with PPI Guru?

To calculate PPI with PPI Guru, simply input the screen's width and height in pixels, along with the diagonal screen size in inches. The app will automatically compute and display the PPI.

### Does PPI Guru identify Retina Displays?

Yes, PPI Guru includes a Retina Display indicator. It determines if a display is Retina based on specific size and PPI thresholds, as defined in the app's logic.

### Can PPI Guru find device information automatically?

PPI Guru can search for device information from the internet. By entering a device name, it attempts to find display specifications via Google, though accuracy depends on search results.

### Can I save device information in PPI Guru?

Yes, device information calculated or searched for within PPI Guru can be saved in a local database for future reference and quick access.

### What devices does PPI Guru support?

PPI Guru is designed to calculate the PPI for various displays, including phones, tablets, laptops, and monitors.

### Is PPI Guru free to use?

Yes, PPI Guru is available for free. There are no costs associated with downloading or using its core PPI calculation features.

### How often is PPI Guru updated?

PPI Guru was last updated on March 16, 2021, with version 1.1. Future updates may be released to improve functionality or compatibility.

### What is the age rating for PPI Guru?

PPI Guru has an age rating of 4+. This indicates it is suitable for users of all ages, with no mature content.

## Version history (last 3 releases)

### 2.0.0 — 2026-11-13

PPI Guru 2.0 is a new, native app for iPhone, iPad, Mac and Apple TV.

• Your own device is recognised and filled in at launch
• Aspect ratio, dot pitch, physical size, total pixels and Retina distance
• Five subpixel layouts with illustrations and effective PPI
• Reverse calculation from PPI to diagonal size
• Compare two displays to scale
• Built-in offline library of about 250 devices
• iPad split view and iPhone Duo support
• Simplified Chinese, Traditional Chinese and Japanese

### 1.1 — 2021-03-16

- Add OLED equivalent PPI result

### 1.0 — 2020-05-20

No release notes.

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## More apps by 基伟 徐

- [Power JSON Editor Mobile](https://appshunter.io/ios/app/power-json-editor-mobile/id1557433043)
- [MermaidEditor](https://appshunter.io/ios/app/mermaideditor/id1581312955)

All apps by 基伟 徐: https://appshunter.io/developer/391905315

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*Data collected daily from the US App Store and indexed by [AppsHunter](https://appshunter.io/). User reviews are verbatim App Store reviews. Ratings, prices and chart positions refresh continuously; this snapshot is from 2026-11-13.*