Alternatives to Slack
In the past we used Slack for internal coordination. We looked for alternatives and after an ukuvota we decided to migrate to Mattermost.
| sign up | app | UI | |||||
|---|---|---|---|---|---|---|---|
| phone number | Use nextcloud
account (SSO) |
web | mobile | desktop | distinct levels | ||
| Slack | yes | no | ? | yes | yes | yes | 3 (workspace), channels, messages, replies |
| Mattermost | yes | no | paid | yes | yes | yes | 3 (instance), channels, messages, replies |
| Zulip | yes | no | yes | yes | yes | yes | 3 (instance), channels, topics, messages |
| Signal | no | required | no | yes | required | yes | 1 (group), messages |
| Simplex | no | no | no | yes | required | no | 1 (group), messages |
| Discourse | yes | no | yes | yes | yes | no | 2.5 [forum] (instance), categories, topics, replies
2.5 [chat] (instance), channels, messages, replies |
| Mailing lists | yes | no | no | yes | yes | yes | ? (list), messages & replies |
| Matrix | yes | no | ? | yes | yes | yes | 4 (instance), space, group, message, thread |