I have several helis with a Spirit system onboard and all of them are adjusted with the Soko tool.
The Soko app is not really neccessary and I used it only once.
After assembling the tool to one blade holder, the tail boom of the modell needs to be levelt, so that the smaller, upper numbers in the tool display show the true angle of the blade. Then pitch 0°, pitch range and travel of all three servos need to be set exactly.
Now set the check box for geometry 6° aktive. The swash plate is tilt now and align the rotor head with the boom.
The reading on the Soko tool should be 6° now and after rotating the head 180° as well.
Most of the time both values show app. 0.5-1° difference. I adjust the number in the software untill the target of 6° is in the middle of both measurements.
If I'm satisfied with everything, I move the Soko tool to the other blade holder and check pitch 0° again.
When both upper links where adjusted exactly to the same length before, both sides should be even and ok.
Yes, it can be done with a standard pitch gauge, but the solid connection of the Soko tool to the head provides a save and very accurate adjustment in a very short time.
The absence of the blades makes the adjusting process also very comfortable. 
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that I can't see where and how to do it with the Soko system.