18+ iOS apps curated and reviewed
The best performance gauges apps on iPhone average 4.0★ across 18+ 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 | 5.0★ (10) | No | No | Oct 2026 | |
| 2 |  | Free | 4.0★ (156) | No | No | Sep 2026 | |
| 3 |  | $9.99 | 4.2★ (2.1K) | No | Yes | Sep 2026 | |
| 4 |  | Free | — | Yes | Yes | Sep 2026 | |
| 5 |  | Free | — | No | No | May 2026 | |
| 6 |  | Free | 3.5★ (22) | No | No | Aug 2026 | |
| 7 |  | $39.99 | — | No | No | Aug 2026 | |
| 8 |  | $1.99 | 3.0★ (22) | No | No | Aug 2026 |
This business application helps hospitality professionals analyze performance data to maximize revenue and improve guest experiences. It offers tools for portfolio managers, property managers, and frontline associates to identify key performance indicators, track employee performance, and set individual goals.
Optimize your Harley-Davidson's performance with this powerful flash tuning tool. Easily download pre-tuned maps, adjust fuel and spark settings, and utilize AutoTune for a customized riding experience. Troubleshoot issues by reading and clearing diagnostic codes.
Turn your smartphone into a powerful vehicle monitoring and diagnostic tool. Track engine performance, fuel economy, and instantly diagnose check engine lights. Features advanced dashboards for performance analysis and off-roading.
