Free
About
Easily calculate the Pixels Per Inch (PPI) for any screen, from phones to monitors. Input screen dimensions and diagonal size to get an instant PPI result and determine if it qualifies as a Retina Display. You can also search for device information online and save your calculations.
✓Automatic PPI calculation
✓Search device information online
✓Retina Display indicator
✓Save device information locally
✓Supports phones, tablets, laptops, and monitors
Show original description
+1
What's New in PPI Guru
2.0.0
November 13, 2026
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
MoreUser reviews
Developer apps
FAQ
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.
