While keeping your contact list on your smartphone or computer is an improvement over the old-fashioned paper address book or Rolodex, it still doesn't handle the biggest issue with contact lists: keeping them up to date.

Making the changes is a tedious, time-consuming process whether it's done electronically or on paper -- and that assumes that you've actually found out that someone has, say, changed their phone number. Theoretically, the always-on all-knowing Internet was supposed to take care of all of this for us, but progress has been limited. The Addappt address book app goes as far as anything we've seen. It replaces the contact app on your iOS or Android device, and will update contact info on your phone whenever the contactee updates their information on their phone.

Which is undeniably cool; the only hitch is that it won't update everyone automatically -- just those who are also on Addappt, so you'll need to start building up a network effect for it to be worth the effort.

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