Chatwork vs Slack — Japanese Team Messenger Compared
Chatwork for Japanese SMB/non-tech teams with heavy external customer comms. Slack for engineering and global integrations.
Positioning
Chatwork is a long-established Japanese SMB messenger. Higher Japan market share than Slack, with strong workflows for connecting externally with customers and partners. Slack is the default for engineering and global startups.
Japan market fit
Chatwork defaults to Japanese UX, JPY billing, easy external customer invitations, and built-in 稟議 / task management. Slack is English-first. External comms via Slack Connect require paid plans.
Usability
Slack embraces channel-based async philosophy. Chatwork combines chat + tasks — tasks live inside messages. Easier for non-technical teams to learn.
Who picks what
- **Japanese SMB / non-technical**: Chatwork - **Heavy external customer/contractor comms**: Chatwork - **Engineering / global startup**: Slack - **Jira / GitHub / PagerDuty integrations matter**: Slack