LINE WORKS vs Slack — Business Messenger for Japanese Teams
LINE WORKS for Japanese domestic business and LINE-using customer contact. Slack for tech startups and global teams.
Positioning
LINE WORKS is LINE's B2B version, deeply embedded in Japanese SMB/mid-market. Can message external LINE users directly, so "internal messenger + external customer contact" lives in one tool. Slack is the baseline for engineering and global teams.
Japan market fit
LINE WORKS defaults to Japanese UX, JPY billing, 稟議, and LINE integration. Especially strong in non-technical SMBs. Slack is English-first with limited Japanese local integrations.
LINE connectivity
This is the biggest difference. LINE WORKS accounts can exchange messages with external LINE users (friend-add). Slack's LINE integration is plugin-level.
Ecosystem
Slack has thousands of global apps. LINE WORKS has richer Japanese SaaS integrations (bidirectional notifications with Chatwork, Sansan, etc.).
Who picks what
- **Tech startup / engineering**: Slack - **Japanese sales, manufacturing, retail**: LINE WORKS - **Customer base on LINE**: LINE WORKS - **Global team + Japan office**: Slack primary + LINE WORKS for external