Measure ambient light levels in Lux using your iPhone's camera. Optimize sleep quality by understanding light exposure throughout the day and night.




249+ iOS apps curated and reviewed
The best libre light sensor apps on iPhone average 3.4★ across 249+ 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 | 4.8★ (113) | No | No | Oct 2026 | ||
| 2 | Free | 4.5★ (2.6K) | No | Yes | Oct 2026 | ||
| 3 | Free | 5.0★ (3) | No | No | Sep 2026 | ||
| 4 | Free | — | Yes | Yes | May 2026 | ||
| 5 | Free | — | No | No | May 2026 | ||
| 6 | Free | 2.4★ (6K) | No | No | Oct 2026 | ||
| 7 | Free | — | No | No | May 2026 | ||
| 8 | Free | — | No | No | Oct 2026 |




Measure ambient light levels in Lux using your iPhone's camera. Optimize sleep quality by understanding light exposure throughout the day and night.




Transform your smartphone into a professional light meter. Measure illuminance and color temperature with scientifically validated accuracy, trusted by professionals. Requires a simple diffuser for precise readings.





This app measures ambient light levels in lux or foot-candles using your iPhone camera. It provides instant feedback on whether a space is too dim, comfortable, or bright enough for various tasks and offers calibration options.