I do Eva Fraser exercises, I have the DVD which I think you need to get as it is hard to grasp from a book.
They definitely do work but it is like all these things, exercise, healthy diet etc. They take time and commitment and sometimes I can't be bothered to do them. But the lift they give your face is noticeable after a few months and I think long term you can take years off yourself if you keep them up.
An app would be good! I know she or her trainees do one to one lessons which I must do at some point. I've been doing them off and on for 5 years so I am a convert though I could do with more dedication if I'm honest.
I recommended ageless if you dare on another thread but went to look for a link just now and couldn't find an active one. She may have stopped doing the program but it was very good and consisted of 10 exercises to do a day...I cant recommend any others as I only did this one but do look for one that is not too complicated and you can stick to over a long period of time (sorry it isn't a more helpful post!)