I have used it in the past and I have had in on this non-jailbroken (lost mine ) for a week or so with no issues. Using api's that are not from the app store always has an element of risk I suppose, but, I have jailbroken every iPhone ever made and most models of the iPad with zero safety issues. YMMV.
Color problem resolved and to recap on what I use from start to YouTube,
I use DU Recorder where all can see also my drone telemetry. I can also do regular filming at the same time.
And now my little secret App called Handbrake which compresses by two thirds the mov. or mp4 file which means greatly reduced time to upload to YouTube and it does upload to YouTube as well saving steps. I had tried quite a few and was sucked in once by a bad one called Freemake, stay away from this one.They try to suck your money by more than one way.
I tried my video converting handbrake with a flight file at 2.87 gb and 30 minutes later the same file is now 387 mb , just imagine having to upload to youtube the 2.87gb size file.
They guarantee same quality film.