This app was mentioned in 10 comments, with an average of 2.90 upvotes
Android user here. Ever since Google Maps introduced real time transit info I've grown to rely on it almost completely. There have been a few no-show buses though, so if I'm in a rush and want to make sure the next bus is coming as scheduled my go-to is Quicky Transit.
I like Quicky the best of the ones I've tried. You can set an alarm for several minutes before the bus is supposed to arrive, which is pretty great.
Oops, I am late to this. Best muni app ever!
https://play.google.com/store/apps/details?id=com.worldofbilly.quickmuni&hl=en
I use the somewhat poorly named Quicky app for Android (formerly QuickMuni). My favorite part is that it also works for Muni, and I like how I can see at a glance what the closest bus to me is based on my location.
edit: link: https://play.google.com/store/apps/details?id=com.worldofbilly.quickmuni&hl=en
MUNI has live GPS tracking if it helps. I like using this app on Android: https://play.google.com/store/apps/details?id=com.worldofbilly.quickmuni
I've had good luck with Quicky Transit for Android.
I use Quickly but only for SF MUNI and it's pretty accurate for that.