Are there any APIs I can use to allow users of my website to easily save my contact information to their phones, desktop email clients, etc? I doubt there are any standards like href=tel: but maybe there's some kind of ad-hoc, cross-browser frame work that can talk to 1st party contact management apps?

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    Multiple standards exist for that, no specific API needed: simply link a VCard file, or encode it to QR Code (or both). A "click" on the VCard link should open it in the corresponding application (if your web server sends the correct mime type) – and almost every QR Code Reader would do the same once it recognized the code. – Izzy Aug 9 '17 at 12:28
  • Thanks @Izzy. I'll do that. – JacobWilliamRoy Aug 11 '17 at 22:07

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