Signal
Slack
| Feature | Signal | Slack |
|---|---|---|
| Pricing | Free only | Free / from $7.25/mo |
| Free Plan | ✓ Yes | ✓ Yes |
| Rating | 4.6 / 5 | 4.4 / 5 |
| Best For | privacy-advocates, journalists, activists, security-conscious-users | teams, enterprise, remote-workers, developers |
| Founded | 2014 | 2013 |
| End To End Encryption | ✓ | ✗ |
| Group Chats | ✓ | ✗ |
| Voice Calls | ✓ | ✗ |
| Video Calls | ✓ | ✗ |
| Disappearing Messages | ✓ | ✗ |
| Screen Security | ✓ | ✗ |
| Channels | ✗ | ✓ |
| Huddles | ✗ | ✓ |
| Workflows | ✗ | ✓ |
| Integrations | ✗ | ✓ |
| File Sharing | ✗ | ✓ |
| Search | ✗ | ✓ |
✓ Signal Pros
- Industry-leading encryption
- Completely free and open-source
- No ads or data collection
- Cross-platform support
✗ Signal Cons
- Smaller user base than WhatsApp
- Limited business features
- No channels or bots
✓ Slack Pros
- Excellent integrations
- Channels system
- Huddles
- Searchable history
✗ Slack Cons
- Message limit on free plan
- Notification overload
- Can be distracting
The Verdict
Signal is built for privacy advocates and journalists, with a focus on end-to-end-encryption and group-chats. Slack targets teams and enterprise and leads with channels and huddles.
Signal uses custom enterprise pricing, while Slack starts at $7.25/mo — a tangible advantage for teams with a fixed budget.
Both offer free plans, so you can test each with your real workflow before committing to a subscription.
This is a genuinely close comparison. If you can, sign up for both free trials (where available) and run a one-week test with your actual team tasks before deciding.
