Application Postage Pro UK (Apr2022 rates)
Postage Pro is the most popular and regularly updated postage app since 2012.
Full postage rates for letters, large letters, small parcels and packets going to the UK and overseas. Save money with advanced checking to see if your item could be sent cheaper (see screenshots for details).
Very useful for ebay / amazon / etsy sellers.
Shows the price you'd pay at the Post Office counter.
Postage Pro UK accepts item weights in grams / kg / ounces and pounds.
Other useful features:
a detailed description of each service is available
automatic switching to Parcelforce for heavier items
automatic calculation of the most efficient way to use 1st/2nd class stamps (eg. for a parcel costing £10.00, use 4x1st class and 10x2nd class)
a size guide in both cm and inches
a handy shopping basket (to calculate totals, unfortunately you can't pay for postage with this app)
xmas posting dates
Check the screenshots to see this app in action.