There is a 3rd alternative...
Atolia, the one and only workspace your team needs
Atolia is a power-packed all-in-one digital workplace: Chat, Video calls, Tasks & Projects, Calendars, Documents, Notes...
Accelerate your team's collaboration game.
Implement it in minutes and save money. Atolia is cheaper than most of the business instant messaging apps.
Why choose Slack or ClickUp?
Both platforms offer a free version, add-ons, roles management, chat, file sharing, mentions, polls, groups/channels, GIF and emoji, and threads. However, Slack has more features such as voice messages, 1-1 and group video calls, whiteboarding, recording, participant permissions, subtitles and translations, and newsfeed. ClickUp, on the other hand, offers more project management features such as online document editing, document viewer, task management, and notes-taking. ClickUp also offers dedicated CSM and end-to-end encryption, while Slack offers on-premise and SAML/SSO authentication.