UK-based Postsnap's app (for iPhone or iPad) enables you to transform your own photos into beautifully personalised postcards. After uploading a shot, apply a unique range of features such as collages, borders, photo effects and custom fonts.
Postsnap's high-quality printed postcards usually cost £1.50, including UK postage, but 5,000 National Geographic Traveller (UK) readers can get their first standard-size postcard for FREE, using code NGPOSTCARD at checkout. Postsnap is free to download from the App Store.
Offer ends 1 October 2015.
Competition is already closed.