The best alternatives to Vita.io are Facebook at Work, Blind, and Blink. If these 3 options don't work for you, we've listed a few more alternatives below.
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Notion— Get over $6,000 worth of Notion + unlimited AI, for free
Blink brings together everything your teams need to communicate in one simple and beautiful app: personalized news feed, secure chat, people directory, content hub, pages, and much more.