12+ iOS apps curated and reviewed
The best ppi guru apps on iPhone average 4.4★ across 12+ titles — we've ranked them by what real users actually keep on their phones. Updated July 2026.
| # | App | Price | Rating | Ads | In-App Purchases | Updated |
|---|---|---|---|---|---|---|
| 1 |  | Free | 3.2★ (6) | No | No | Aug 2026 |
| 2 |  | $0.99 | 4.5★ (868) | No | Yes | Aug 2026 |
| 3 |  | Free was $0.99 | 4.7★ (37) | No | No | Aug 2026 |
| 4 |  | Free | 4.3★ (3) | No | No | Jul 2026 |
| 5 |  | Free | 4.3★ (12) | No | No | May 2026 |
| 6 |  | Free | 4.4★ (7) | No | No | May 2026 |
| 7 |  | Free | 4.7★ (1.1K) | Yes | Yes | Aug 2026 |
| 8 |  | Free | 5.0★ (2) | No | Yes | May 2026 |
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.
This utility app helps you calculate and scale screen resolutions based on aspect ratios. Save and manage your frequently used resolutions for easy access. Sync your presets across Apple devices.
Calculate your display's pixel density (PPI) using its dimensions and pixel count. Learn about PPI and DPI definitions, and how to categorize screen resolution.
Calculate display settings like DPI and PPI using only screen resolution and diagonal measurements. This straightforward utility tool provides essential display information.
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.
Calculate display parameters for monitors, phones, and notebooks. This tool helps determine base settings for various devices.
Easily modify the DPI (dots per inch) of your images. Save, share, email, or print your adjusted photos with new DPI values.
Easily convert pixel values to percentages and vice versa for screen dimensions. Supports coordinates and sizes, with multiple target screen sizes and orientation options. A lightweight and responsive tool for developers.
