93+ iOS apps curated and reviewed
Every iPhone needs a few good ppi apps. We benchmark 93+ of them on App Store rating, freshness, and pricing, then surface the standouts so you don't have to scroll the App Store yourself.
| # | App | Price | Rating | Ads | In-App Purchases | Updated | |
|---|---|---|---|---|---|---|---|
| 1 |  | Free | 3.2★ (6) | No | No | Sep 2026 | |
| 2 |  | Free | 4.6★ (35) | No | No | Sep 2026 | |
| 3 |  | Free was $0.99 | 4.5★ (66) | No | No | Sep 2026 | |
| 4 |  | Free | — | No | No | Aug 2026 | |
| 5 |  | Free | 4.4★ (13) | No | No | Aug 2026 | |
| 6 |  | Free | 5.0★ (2) | No | Yes | Sep 2026 | |
| 7 |  | Free | — | No | No | May 2026 | |
| 8 |  | Free | — | No | No | 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 mobile companion app provides on-the-go access to Kaplan's PPI online courses and learning hub. It syncs with your desktop account, offering Qbank quizzes, video lectures, flashcards, and progress tracking for test preparation.
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.
