I use Red Stamp and Sincerely on mobile to shoot off quick cards to the old folks (grandparents, etc.) and when I need to do something more personalized like Thank You's or party invites. Also use Lettrs for actual letters. Wish this Letterly thing was a mobile app, though.
I am a big believer in surprising people with cards via regular mail. I still write thank you notes and send postcards - it is such a simple way to make people happy. That being said, buying stamps and actually sending the card can be the tough part. Letterly takes on the actual "logistics" in sending.
For those of you that spend your time in text editors and prefer typing to writing - this makes sending birthday cards even easier. :)
Sending snail mail thank you's is a classy gesture. I like to personally write them out, but it isn't very scalable. Hope to try this out!
Report
Some feedbacks on the order process: I think it could be nice to have a preview of the chosen "Handwritting style" right inside the order process (or on the product page)! Also the "Arrival date" should maybe only appear if "By specific date" is selected! I bet you guys are going to work hard on this part so good luck :)
Alec from Letterly here! Excited to be featured in the hunt and grateful for the positive comments. We also just launched our Corporate/Custom card offering, so if you want to send custom thank you cards for your business, check out the site. Thanks again, folks!
Product Hunt
RookieUp
Golden Kitty Awards 2016
Mute.vc