Postcards are quick and fun, but some occasions call for a little more formality. Created by the same company as Postagram, use Ink Cards (free; Android and iOS) to send personalized greeting cards through the mail.
The Ink Cards app is, not surprisingly, very similar to Postagram. Instead of postcards, you get actual greeting cards, and instead of $1 apiece, they cost $2, which is actually very cheap when you consider the cost of regular greeting cards. To get started, open up the Ink Cards app and choose a template. Templates are organized into categories, which include birthdays, various holidays, and miscellaneous categories such as "Pets" and "Thinking of You." Most templates include a place to put your own photo, but you'll also find some non-personalized cards with cutesy graphics and Hallmark-style sayings.
Once you've picked a template, you can modify its elements: Add your own photo, personalize the message, and adjust the color scheme (if applicable). When your card looks perfect, tap continue to add your recipients' address and make your purchase. If your recipient is in the U.S., they'll receive the card in three to seven days; if your recipient is international, it'll take seven to ten days.
I first discovered Groovebook ($3 a month; Android and iOS) on ABC's Shark Tank. The concept--get your photos off your phone and into your hands in a neat, cheap little book--wooed both me and the sharks (app creators Brian and Julie Whiteman made a $150,000 deal with Mark Cuban and Kevin O'Leary). The subscription-based service costs just $3 per month, including shipping, and delivers a physical photo book of up to 100 photos directly to your door.
While Groovebook's concept is fantastic, its app needs a little work. However, if you're the type of person who likes to show off your phone photos, it's definitely a lifesaver. Not only is it significantly cheaper than developing your photos one by one (CVS Pharmacy charges 19 cents per 4-by-6-inch photo), it's also vastly more convenient.
To get started with Groovebook, download the app and sign up for an account. Your book is technically free--you just pay $3 shipping and handling. You can upload up to 100 photos each month to go in your Groovebook, and if you upload fewer than 100 (at least 40) you'll just see repeats. Groovebooks are delivered once a month (when you're nearing the deadline, the app will send you an alert), and feature a soft, textured cover, 100 full color prints, and perforated pages so you can remove pictures and frame them or stick them in real photo albums. The photos are sort of halfway between matte and glossy, and are printed on very thin paper--you are only paying about 3 cents per photo, after all.
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