Shameless plug: I did create a very basic web based invite app with the goal of being platform agnostic - I really think having a app like Invites or my https:/

Shameless plug: I did create a very basic web based invite app with the goal of being platform agnostic - I really think having a app like Invites or my https://rsvp.ngo/ https://rsvp.ngo/ fills the need of getting invites out across platforms.