Do people that I invite need to have the app?
No. Spond also invites through SMS and e-mail. When the first group invitation is sent out we encourage users to download the app but you can also keep receiving notifications by email if you don’t download the app. The initial group invite can be sent as an SMS but there is only a limited number of SMS per user so we do recommend registering with an email to continue receiving notifications.
Members can also log in on https://spond.com/login to get a full overview of the group if they chose to receive notifications per email. If someone logs out of the app, invitations will start coming as emails instead.