Quick Summary
Slack
Slack app with Block Kit and threads
- Socket Mode (no public URL needed)
- Block Kit formatting
- Thread support
Signal
Encrypted messaging via signal-cli daemon
- End-to-end encryption
- Group support
- Media attachments
Capability Comparison
| Capability | Slack | Signal |
|---|---|---|
| Direct Messages | ✓ Yes | ✓ Yes |
| Group Chats | ✓ Yes | ✓ Yes |
| Media Messages | ✓ Yes | ✓ Yes |
| Voice Messages | — No | ✓ Yes |
| Reactions | ✓ Yes | ✓ Yes |
| Thread Support | ✓ Yes | — No |
| Native Commands | ✓ Yes | — No |
| Text Limit | 4000 chars | 4096 chars |
| Protocol | @slack/bolt | signal-cli (external daemon) |
Access Control Policies
Slack
DM Policies
allowlistpairingopen
Group Policies
allowlistopen
Signal
DM Policies
allowlistpairingopen
Group Policies
allowlistopen
Best Use Cases
Choose Slack for:
- Workplace AI assistant
- Team productivity
- DevOps automation
- Customer support
Choose Signal for:
- Privacy-focused assistant
- Secure team communication
- Journalism/activism
- Healthcare communication
Use with AI Providers
Both channels work with all OpenClaw AI providers:
Frequently Asked Questions
Which is better for AI assistants, Slack or Signal?
Both work well with OpenClaw. Slack is better for workplace ai assistant, while Signal excels at privacy-focused assistant. Consider your audience and feature requirements.
Can I use both Slack and Signal with OpenClaw?
Yes! OpenClaw supports multiple channels simultaneously. You can connect the same AI assistant to both Slack and Signal, allowing users to interact through their preferred platform.
Which has better group chat support?
Both support group chats. Slack uses allowlist, open policies, while Signal uses allowlist, open.