Just had Evohome installed, the app does not even load 95% of the time on my Samsung S7 - sometimes it accepts the login and sometimes just sticks on the login screen. If you do manage to get past the username/password, it sits on the reconnecting for ages. 1 time in 20 it will then show the main control interface but, if you leave it 30 secs, it logs you out. After this, it will never work until phone is rebooted. And then only sometimes.
On a Google tablet, works fine (though it is a seriously rubbish interface with dreadful ergonomics - who designed the scheduler!)
iOS version, constantly fails to save changes to schedule.
More than disappointed thus far. Plus the radiator valves are noisy enough to wake my daughter at night.