249+ iOS apps curated and reviewed
The best slope angle apps on iPhone average 4.4★ across 249+ 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 | 4.4★ (295) | Yes | No | Sep 2026 | |
| 2 |  | Free | 3.4★ (64) | Yes | No | Sep 2026 | |
| 3 |  | Free | 4.5★ (700) | Yes | Yes | Sep 2026 | |
| 4 |  | Free | — | Yes | Yes | Sep 2026 | |
| 5 |  | Free | 4.2★ (2K) | Yes | Yes | Sep 2026 | |
| 6 |  | Free | 4.3★ (104) | No | Yes | Sep 2026 | |
| 7 |  | Free | 4.6★ (15K) | No | Yes | Sep 2026 | |
| 8 |  | Free | 4.4★ (359) | Yes | Yes | Sep 2026 |
Easily measure tilt angles with this free protractor app. It displays inclination from 0 to 359 degrees, along with gradient percentages and angles summing to 180 or 360 degrees. Switch to theodolite mode to set a specified angle to zero.
Measure angles and slopes with your phone's camera. Offers real-time angle display, two measurement modes, and the ability to capture and store measurements.
This app transforms your phone into a precise leveling tool. It offers accurate angle measurement, inclination detection, and augmented reality features for DIY and professional use. Calibration is simple and quick.
