Peerio is an end-to-end encrypted collaboration suite with group chat, file storage, and (upcoming) email- all geared for teams. Having the chance to use it in different environments, Peerio feels a bit like Slack; only way more secure, and unfortunately, less refined. That said, if you're looking for security and aren't concerned with user experience extras, Peerio is a strong option.
Peerio's encryption is top-notch, but it's worth mentioning that one of their cofounders left the company in 2016 because of his concerns around the potential for administrative backdoors in Peerio's encryption. Peerio has strongly rejected his concern stating that it'd be antithetical to their mission of preserving user privacy. All this said, don't forget to consider your threat models when choosing a team communicator.
SKILL LEVEL: BEGINNER
Use Instead of
SMS, Facebook Messenger, Snapchat, Google Hangouts, Skype, AIM, or Yahoo Messenger
iOS, Android, MacOS, Windows, Linux
Beyond their cryptography, Peerio's features are slightly behind some of their competitors.
Using Peerio feels solidly 'alright'. It's not amazing, but far better than some competitors.
Peerio feels much more polished than some apps, but lacks some sophistication in their product design.