I have one called “stork” but I wish I could make the start/stop into a widget
In my previous pregnancy, I turned off the auto locking feature on my phone when I was having consistent contractions for this reason! I just left the app open and pressed the start/stop.
I tried the baby center app tracker, but had the same problem with it taking too long to get to the tracker part. Now I'm using Mama Tracker (it's on android, not sure about iphone). It's way quicker to navigate and get to the contraction part of it (there's a section for kick counts and contraction counter but that's pretty much it).