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Postcardly Postcards takes you through the process, and each step is obvious with the simple and intuitive interface.
The only issue I found with this app is the move and scale screen, which displays your image sideways, making it a little confusing. Not to worry, your image will show up correctly on the postcard when you go to the next screen.
You get a pretty good amount of room to type, with a 500-character limit (about 100 words).
When you're done with your message and have added your address, you get another look at the postcard before you send it out.
At the end, Postcardly Postcard lets you know it has received your postcard and it will go out very soon.