I got a gbs app for iOs on my iPhone called SpeedBox Performance tracking. It automatically times standing start things like 0 to 60, 0 to 100 - and it also has 50 rolling start presets like 50 to 100.
It also has time to distance including 1/8 mile, 1/4 mile and 1/2 mile. It is fully automatic
it is very inexpensive, I think it was $2 and the author has been very willing to add custom presets that were not in the app whenI first got it (they are all in the current version in the app store
anyway if you want an inexpensive way to time your 1/4 mile or other such things that is totally hands free I recommend it
As far the the V Box or the Dragy they do cost more but they are both verified with 1/100th accuracy comparing it to a time slip at a drag strips.