Openbook vs Slack
| Openbook | Slack | |
|---|---|---|
| Free plan | Yes | Yes |
| Free trial | No | No |
| Paid from | $15/mo | $8.75/mo |
| Open source | No | No |
| Platforms | Web | Android, iOS, Linux, macOS, Web, Windows |
| Free plan | Yes | Yes |
| Org chart | Yes | — |
| SSO | Yes | — |
| Paid from | — | 7.25 /user/mo |
Both are listed in Best Employee Directory Software. On Samsung Mobile US Press, Slack scores higher on our published basis.