HR interval training app

Hi folks, just got myself a set of rollers for indoor training during wet/cold weather (I'm getting older...). Looking for an android app to use for HR-based interval training like I do in the gym on a static bike. In the gym I'm able to set up a workout interval schedule, ie an hour riding based on 5 minutes at 145bpm then 2 minutes at 180bpm etc. Or I can set up a 'hill' route by randomly altering the HR zones I should be in at each time, mirroring climbs and descents etc.
I can find lots of apps that log HR rides, some that show you your live HR so you can do that manually etc, but nothing that I can see that you can pre-program your work out like you can on a good quality static bike?
I can find lots of apps that log HR rides, some that show you your live HR so you can do that manually etc, but nothing that I can see that you can pre-program your work out like you can on a good quality static bike?
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I use an app called "seconds" for this, but there maybe others.