Yes! Zulip Cloud Standard is free for open source projects; we're proud to fully sponsor hundreds of worthy organizations. We also offer steep discounts (usually 85%-100%) to many non-profits, educational institutions, groups of friends, and in other scenarios where most of the users are not fulltime employees of the customer. Generally, only closed organizations that also pay their members’ salaries pay full price.
You can request sponsorship during organization creation, in an organization's billing page, or contact us at sales@zulip.com
You may also be interested in Zulip for open source projects or Zulip for working groups and other part-time communities.
Yes! Some of our biggest fans have hundreds or thousands of users, including Fortune 500 companies like Akamai, and open source communities like The Recurse Center. If you’d like to see a large Zulip in action, the Zulip community server has thousands of accounts and hundreds of weekly active users, and is run on a single machine with 8GB of RAM.
You can always use a credit card to pay, and we can bill by invoice for amounts over $1000.
Yes! Our high quality export and import tools (cloud, on-premise) ensure you can always move from our hosting to yours (and back). If you’d like to do a migration, email support@zulip.com and we’ll get you started!
Guests cannot see or join streams they are not invited to. Guests subscribed to more than 1 stream are billed like regular users. Guests subscribed to a single stream are generally free, unless you have more than 5 times as many single-stream guests as paying users. More details are available here.
Only the most recent 10,000 messages can be viewed and searched with Zulip Free. Older messages are still stored and will become available again should the organization purchase a paid plan or get Zulip Cloud Standard free because they are an open source project or similar organization.
Stop by the Zulip community server to see Zulip in action and chat with the developers, tweet @zulip, or shoot us an email at sales@zulip.com!
| Feature | Zulip | Slack | Mattermost | Discord |
|---|---|---|---|---|
| Apps for every platform | ||||
| Hundreds of integrations | ||||
| Hosting available | ||||
| Emoji reactions | ||||
| Markdown formatting | ||||
| Topic-based threading | ||||
| Lightning-fast search | ||||
| Free and open source | Open Core * |
* Mattermost Team is open source, but many features are only available in their proprietary version, Mattermost Enterprise.