A reflected light meter with spot metering (using the device's camera) and an incident light meter (using the device's light sensor) in one app. Tested accurate against Gossen and Sekonic meters on most devices.
Can be used for any type of camera from film SLR to pinhole to cinematographic.
In addition to the two meters, the app includes a Sunny Sixteen calculator, and Depth of Field calculator, and a EXIF Reader.
Fix for Samsung camera issue--please let me know if this continues to not work.