The best alternatives to PurpleSlate are Google, Beer?!, and Paperless Post. If these 3 options don't work for you, we've listed a few more alternatives below.
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Let's Rally is a dead simple communication app, that lets you blast out invites to anyone in your contacts. Pick the location, set the activity, select a group, set the time & confirm. Push notifications are sent to signed up invitees, SMS to the others