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 Monday or Mattermost?
Mattermost, however, is more suitable for tech companies as it is marketed towards the tech industry. It also offers more chat-related features such as mentions, voice messages, and group video calls, which Monday.com does not have. Mattermost also has unlimited storage, while Monday.com has a minimum of 5GB storage.