What is a good swim pacing app?

I need a swim app that I can set specific intervals with iphone 6plus. I need one that can allow me to do ladders. I have an app called pacer. It sets intervals but I can't set different times. I need one that can do specific times. Example:
Ladder set
50 on the 40 second
100 on the min
200 on the 2:30
100 on the min
50 on the 40
The app that I have now can only do one time along with rest in between
Example:
100's on the minute.
I can't get specific and make the whole set that I want. I prefer the app to be free but if i have to pay then it's fine as long as it "gets the job done"*drakes voice*

Ohh wait. My times are way off but you guys get it i hope

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