Cine Meter II (
https://www.adamwilt.com/cinemeterii/)
It has zoomable reflected, incident (need to buy the Luxi sphere, about $22), and color metering. It isn't cheap ($25), is iPhone only, and can take a bit of reading to learn, but is a perfect backup and travel meter. After calibration it remains well within a 1/3 stop of my Pentax spot throughout the range (which is as precise as the digital Pentax will get) and within a 1/5 or so of my Sekonic incident. The color meter appears as accurate as an Minolta color meter I borrowed, and was well aligned. The creator is very responsive.
I still prefer my Pentax spot primarily because of ease of use with Zone system and habit, but have found Cine Meter II to be as reliable, at least in the 2 years I have used it. I have also found it to be more accurate and easier to use than the Pocket Light Meter app.
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