Flock is a communication app for teams. Packed with tons of productivity features, Flock drives efficiency and boosts speed of execution. Developed by RIVA FZC
License: Freemium
Mattermost is a highly customizable, open-source platform suited for larger teams needing extensive features and security, while Flock offers a more user-friendly, straightforward experience ideal for small to medium-sized teams. The choice between them largely depends on the specific needs for customization, security, and team size.