Don't be fooled by beta state. Kurt is not a recent engine. It was written by Oliver Uwira from Germany relatively long time ago.
The version ported to Android by Jim Ablett just today was originally released in 2010. Regarding the strength, CCRL rates v0.9.2.2 at 2173 ELO on a PC. I guess the beta version on Android will play around 1900.
Download Kurt: HERE