The Sincerely Inc apps haven't been released just yet, but it looks like this cross-platform app might be Cards' biggest competetor. Choose from over 30 holiday designs and send real-life cards to everyone in your contacts list with only a few clicks.
Cost: 5" by 7" cards start at $1.69
Availability: Will soon be available on Android, iPhone and iPad; head to the website to sign up for an email update when the app is released.
Red Stamp isn't just a snail-mail card app—you can choose to send cards for a variety of occassions through text, email or social post—but they're a legit way to get out a batch of Christmas cards on a budget. Send postcards (including postage!) for less than a buck.
Cost: Snail-mail cards start at 99¢
Availability: Available on iPhone and iPad
Postagram is brought to you by Sincerely Ink, the first mention on this list. What makes this app different is that it deals exclusively in creating in-the-pulp cards from your Instagram photos.
Cost: Postcards are 99¢
Availability: Available for Android and iPhone
Apple's newly-released app (which was announced alongside, and then eclipsed by, the iPhone 4S) is the most expensive way to send a card on this list, but it's also the highest quality. Cards prints and mails—with a real stamp—beautiful letterpress cards. If you want to impress the family, this is the way to do it.
Cost: Cards are $2.99 in the U.S.
Availability: Available for iPhone and iPad