I just searched "contraction timer" in the app store and a ton of them popped up. They all have the same functions, but there are few more bells and whistles on some than others.
I am sure there are many more since I had my son over 2 years ago, but I would download a couple ad see what format you like. They all functioned the same, but some showed me the progress differently which I liked
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I used one for my last pregnancy and luckily it was free because I quickly discovered that MH and his stopwatch worked much better for me. I didn't like having to mess with my phone when a contraction came on. He also liked having that role. Personally, I would recommend getting a free one.
Re: Contraction app?
This