Slack is a team collaboration platform offering channels, direct messaging, file sharing, searches, and integrations with tools like Google Drive, GitHub, and Jira. It supports threads, reactions, voice/video calls, and bots.

Slack is blocked in mainland China. Web and desktop apps fail to connect, and message delivery is disrupted. No official local hosting exists. Local replacements include Tencent WeCom, Feishu (Lark), or DingTalk, which support similar channel/chat workflows and comply with data laws.

The information regarding service availability in China is provided for general reference purposes only. Due to the dynamic nature of network conditions and regulatory environments, the actual accessibility of these services may vary over time and by location. Users are advised to verify the current status independently.