249+ iOS apps curated and reviewed
From beginner-friendly picks to power-user tools, our diagonalobdii list covers 249+ iPhone apps updated through September 2026. Compare ratings, prices, and screenshots in one place.
| # | App | Price | Rating | Ads | In-App Purchases | Updated | |
|---|---|---|---|---|---|---|---|
| 1 |  | Free | 5.0★ (1) | No | Yes | Aug 2026 | |
| 2 |  | Free | 4.6★ (48) | No | Yes | Aug 2026 | |
| 3 |  | Free | 4.6★ (5K) | No | Yes | Sep 2026 | |
| 4 |  | Free | 4.5★ (4.3K) | No | No | Sep 2026 | |
| 5 |  | Free | 4.5★ (15) | Yes | Yes | Sep 2026 | |
| 6 |  | Free | 4.8★ (956K) | Yes | No | Sep 2026 | |
| 7 |  | Free was $1.99 | 4.6★ (354) | No | Yes | Sep 2026 | |
| 8 |  | Free | 4.7★ (207K) | No | No | Sep 2026 |
This app helps mechanics perform vehicle drive cycles more efficiently. It provides real-time monitoring of emissions monitors and diagnostic trouble codes (DTCs), offering clear guidance and instant explanations to ensure vehicles pass inspection quickly and accurately.
Transform your smartphone into a comprehensive car diagnostic tool. Read and clear trouble codes, monitor real-time vehicle performance, and customize your dashboard for a deeper understanding of your car's health. Includes free engine diagnostics with optional advanced features for specific brands.
Transform your smartphone into a professional car diagnostic tool. Read and clear engine fault codes, monitor real-time sensor data, and perform advanced diagnostics without a mechanic. Supports a wide range of OBD2 compliant vehicles.
