Best contraction calculator?

Question

Hi all! 
During our birthing class at the hospital, the nurse mentioned using an app for counting contractions. 
Anyone have a favorite? There are a ton of options and I don’t want something crazy difficult to use. 
Thanks!

Answer

Following

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To piggy back on my last comment...this is what the app looks like when it’s in use. This is actually from my last labor..

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This one was by far the best. I tested several. I can’t remember..:I think I paid like $3 or something for the app. Worth every penny.

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The Bump app has one that I like!