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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Universal-2 by AssemblyAI— Speech-to-Text API for conversational data
Search the world's information, including webpages, images, videos and more. Google has many special features to help you find exactly what you're looking for.
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