Rocket.Chat
Team chat. Community code is MIT, enterprise directories are not.
Not affiliated with Salesforce
Free software that replaces Slack
No per-seat licence. Slack is a product of Salesforce. Open SaaS Alternatives is not endorsed by them.
Slack
List price not stored. We have not stored a list price. Vendor pages and roundups disagreed, or the page was not re-checked for this build. Type the figure on your invoice into the calculator.
Zulip
Chat organised by topic, under Apache-2.0.
Mattermost
Team chat. Source is AGPL unless you buy a commercial licence.
Element
A Matrix client. You still need a homeserver.
Stoat
Team chat previously known as Revolt. The server is AGPL.
Coverage of the main jobs
✓ does it, ◐ partly, ✗ no, — not assessed. Editorial only.
| Job | Rocket.Chat | Zulip | Mattermost |
|---|---|---|---|
| Channels | ✓ | ✓ | ✓ |
| Direct messages | ✓ | ✓ | ✓ |
| Searchable history | ✓ | ✓ | ✓ |
| Apps and integrations | ✓ | ✓ | ✓ |
| Threads | ✓ | ✓ | ✓ |
Questions
What replaces Slack without a per-seat licence?
Rocket.Chat leads this list on measured signals (58). Rocket.Chat is a Slack-shaped server with channels and a wide set of integrations. The licence file puts code outside the ee directories under MIT. Omnichannel and other commercial pieces live elsewhere in the tree.
How much does Slack cost for 10 people over three years?
We have not stored a list price. Vendor pages and roundups disagreed, or the page was not re-checked for this build. Type the figure on your invoice into the calculator. The calculator on this page uses the number on your invoice, not a guessed list price.
Is Open SaaS Alternatives affiliated with Slack?
No. Slack is a product of Salesforce. We are not affiliated with, endorsed by, or sponsored by Salesforce. “Replaces Slack” describes the job, not a partnership.
Scores follow the published formula.