Saraugie
Formerly known as Saraguie
I'm testing out the audio quality playing flac (including hi-res flac 192kHz 24bits) on various apps:
Neutron
Accudio (by Golden Ear)
Onkyo HF Player
AmpliFlac(HD)
Flac Player+
Cappriccio Free Ultimate Music Player
Flac Player Pro
Golden Ear
MyAudiostream Pro
etc
My preference goes now to Accudio and Onkyo HF Player in terms of sound quality and user interface.
Neutron sounds great too on Android phones but appears too analytical on Iphone 6 (see evaluation earlier by kelvinwsy)
However Neutron sounds warmer on iPhone 5s... YMMV
Suggest you try out what you like to see how they pair with which phone. You didn't tell us what earphones / headphones you use...
Enjoy the music ^_^
I just tried JVC's Sonic Max Pro. Its too bad it does not support FLAC as it has the best EQ fine tuning I've ever used. It actually adjusts depth and soundstage.