250+ iOS apps curated and reviewed
The best slope angle apps on iPhone average 4.1★ across 250+ titles — we've ranked them by what real users actually keep on their phones. Updated October 2026.
| # | App | Price | Rating | Ads | In-App Purchases | Updated | |
|---|---|---|---|---|---|---|---|
| 1 |  | Free | 4.3★ (314) | Yes | No | Oct 2026 | |
| 2 |  | Free | — | Yes | Yes | Oct 2026 | |
| 3 |  | Free | 4.5★ (15K) | No | Yes | Oct 2026 | |
| 4 |  | Free | 4.5★ (720) | Yes | Yes | Oct 2026 | |
| 5 |  | Free | 3.5★ (79) | Yes | No | Oct 2026 | |
| 6 |  | Free | 4.3★ (362) | Yes | Yes | Oct 2026 | |
| 7 |  | Free | 4.2★ (2K) | Yes | Yes | Oct 2026 | |
| 8 |  | Free | 4.3★ (104) | No | Yes | Oct 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.
This utility app functions as a digital bubble level, angle meter, and tilt meter. It helps users align picture frames, measure slopes, and assist with home decoration. Calibration instructions are provided for accurate measurements.
