13+ iOS apps curated and reviewed
The best ppi guru apps on iPhone average 4.1★ across 13+ titles — we've ranked them by what real users actually keep on their phones. Updated September 2026.
| # | App | Price | Rating | Ads | In-App Purchases | Updated | |
|---|---|---|---|---|---|---|---|
| 1 |  | Free | 3.2★ (6) | No | No | Aug 2026 | |
| 2 |  | Free was $0.99 | 4.5★ (66) | No | No | Sep 2026 | |
| 3 |  | $0.99 | 4.5★ (868) | No | Yes | Sep 2026 | |
| 4 |  | Free | 4.3★ (3) | No | No | Jul 2026 | |
| 5 |  | Free | 4.4★ (13) | No | No | Aug 2026 | |
| 6 |  | Free | 5.0★ (2) | No | Yes | May 2026 | |
| 7 |  | Free | 4.4★ (7) | No | No | May 2026 | |
| 8 |  | Free | 4.7★ (1.1K) | Yes | Yes | Sep 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.
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.
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.
