Of the 24 apps listed in this article, five stand out due to their security features: Microsoft Teams, Slack, Wire, Wickr, and Proofhub. Microsoft Teams offers end-to-end encryption in every type of communication. Slack enables access restriction and uses Enterprise Key Management, which empowers the administrators to control the data being shared in the app. Wire uses the Proteus encryption protocol that encrypts messages. Wickr is 256-bit end-to-end encrypted and Microsoft Teams but it also uses a new key for each message or call.