Brand identity for the collaboration hub captures its simplicity and ease of use. Slack offers a new and a better way to work together by replacing email inside companies of all sizes; providing a place that connects conversations, information and software.
Designer: Pentagram
Slack Brand Identity
Slack Styleguide
Fonts: Larsseit, Slack Circular
Also, check out this pretty cool collection of early designs from 2017 and 2018 from Russell Shaw, the Lead Brand Designer at Slack.