Show HN: I built a contact info sharing app that uses end-to-end encryption

Staying connected with friends can be a challenge as people move or change jobs. I don't have my college roommate's home address, my aunt's phone number, or an email to send a note to any of my former co-workers. So, I built a digital contact card sharing app, called Neucards, that keeps contact info up to date. It remembers where and when I exchanged digital cards with someone and gives me a running history of when changes were made. I can see what card I gave someone and even give them a different card later. Most importantly, it maintains privacy by using end-to-end encryption, so only the people I give my card to have access to my card or account info. It's available on iOS in the US AppStore and I'd love to hear your thoughts.