For Valentine's Day, some apps to rev up your relationship that I personally love. After all, this Hallmark invented holiday comes only once a year and the reality is, if you only focus on one day, you won't have a relationship for long :).
Avocado is an app that let's you stay in touch with your sweetie by sending cute messages, share photos, manage dates, create shared lists (vacation ideas, grocery lists), and send hugs and kisses (the app vibrates when you place the phone against your chest).
BeCouply is an app that offers fresh ideas for date night.
Treat lets you design your own greeting card using personal photos and customized text. These are real greeting cards you can send to your sweetie. The app is free but, of course, the cards comes with a price.