Recommended Performance App/Device (1/4 mile,HP, etc)

[Spurshot]

I'm looking for recommendations for a performance app/device.

 

I have an iPad Air, Samsung S3, and Windows laptops.

 

I want a reliable, repeatable, system. Being reasonably accurate would be a desirable characteristic too. Mostly, I want to measure modification effect.

 

I appreciate your recommendations.

[Rawyzf]

I use the dashboss. I had it left over from the G8, and the 9-7x Aero, so I figured why not use it in the truck too.

 

I haven't done much (nothing performance wise) for modifications. I do use it to see current gear, instant mpg, and then I like to play a little game on each drive to see if I can stay in v4 mode longer than v8 mode, and this captures that information.

[SILVER SLED]

I have a dashhawk that I used in my TBSS. It was accurate within a tenth in the TBSS. So I figured wtf and hooked it up in my truck. I mostly look at trans temp, coolant temp and intake air temp.