LightSpectrum Pro

Lagged to shreds first use on iPhone X iOS 13.2. Seems to work!

Poor accuracy in the 2500K to 3000K range.

Im outside and ut should be daylight, about 5500 kelvin and the app shows 2200 kelvin... Not even close.

Dont work at all on the iPhone 5.

Can't get it to work With ipad3. Avoid this app.

Does not work on iPhone 5. Just a blue screen instead of the camera view. App Support link is invalid! Avoid this app.

I have some LEDs where I know the wavelengths, and under some combination lighting conditions the app is super inaccurate—but under lots of conditions (including combination ones) it’s very accurate. Useful tool, overall. I wish they would fix the inaccuracies but I’m still glad I have this app; there’s no other app that has a full spectrogram right now.

This app needs to have crosshairs or circle at a point on the screen, to only take measurements. General averages of the picture isn’t a great feature. Spot metering will make this app awesome!

This inexpensive app does a great job on my iPhone of measuring light color temperature which is exactly what I wanted!

I used to use a $2,000 light meter to measure color temperature when I worked in the film industry. This meter costs only a few bucks and is almost as good. The app description says it’s within 8% of the actual color temperature, which in most circumstances is sufficient. I tested the app in a variety of environments; I.e. outdoor sunny, outdoor cloudy, interior lights, balanced to daylight, cool white, etc. and it worked great. If you’re doing scientific measurements it might not be what you need but for film and video it’s pretty great.