A new app which looks tiny and simple, based on GreKo 12.9 engine (~2450 ELO). I think it will only appeal to casual players because i didn't see any clock settings in the screenshots but only a difficulty setting. My basic rule of thumb is CLOCKS = SERIOUS APP.
Thanks to Mhoadiev de la Paz for sharing info about Metal Chess. Although i won't install it, i guess some others may be interested. So HERE's the Google Play link to this app.