I have just published Speccy 2.2 for Android and Windows:

https://play.google.com/store/apps/details?id=com.fms.speccy.deluxe -- full Android version
https://play.google.com/store/apps/details?id=com.fms.speccy -- free Android version
http://fms.komkon.org/Speccy -- free Windows version

Speccy emulates several Sinclair ZX Spectrum models and their clones. The newly released version adds 64-color ULA+ emulation, customizable color palettes, and several default color palettes. See full change list below:

• Added ULA+ emulation with 64-color display mode.
  
• Added "Color Palette" option for changing color palette.
  
• Added support for custom color palettes for each tape or snapshot.
  
• If you have Game.z80 or Game.tzx, place colors into Game.pal.
  
• Added support for global color palette in /Speccy/Speccy.pal.
  
• Each *.pal file should contain 16 lines with colors in "#RRGGBB" format.
  
• Made display mode changes more reliable.

Merry Christmas!