I just bought that Solo App by Tom Quayle & David BeeBee

It’s really good ,I knew a lot of my intervals ascending but found it difficult descending 
  It’s jolly good fun to play with & you soon end up having them embedded in your head 
  After a while . I’d highly recommend it to anyone who needs this type of knowledge .
  You can work on finding notes , working on single or multiple intervals , finding intervals on chordal progressions etc . It’s quite accessible to anyone  

if you like the sound of it look at some videos on YouTube to see if it would be suitable 

Alas full functionality only available on iphone. Feel a bit short changed on Android

Ahh that’s a shame , he did address this on a recent video , it wasn’t apparently selling very well on Android . I’m using it on an iPad . I don’t use a mobile but I do have an old iPhone that I use as a portable camera/video camera/portable computer etc .