Paintvoice is a singing synthesizer mobile app. there are some default voicebanks installed and you can use any CV voicebank. its pretty low quality tho
Paintvoice DL + source code
Paintvoice ver. 3.0 source code
Paintvoice Utau port
CV encoded, contains two default voicebanks: PaintVoice_000 female and PaintVoice_001 male.
Source extraction/vb location/raw to wav conversion by mildemewe, oto by ryan-kun.