The home of Postage Pro UK and ManyStamps
Click for information on Postage Pro,
Or for direct links to the apps on Google Play:
Postage Pro UK
(paid supporters who keep the app being updated, gives postage prices for Royal Mail and Parcelforce, information on services, international postage price zones and much more)
Free Postage Pro UK
(free, for people who buy stamps in bulk and want to quickly know how many first and second class stamps to use to get amounts like £8.45 of postage).