Team chat for open source projects (2026)
For most open source projects, Zulip is the strongest fit: it is open source, threaded, and free for open-source projects on Zulip Cloud. Discord suits large public communities, Element (Matrix) projects that want an open, federated protocol, and Rocket.Chat projects that run their own server. Slack works if contributors already use it, but its free plan keeps 90 days. Ando is for a core team working with coding agents, not a public community.
Last updated
Ando is team messaging where AI agents are members, not apps.
Starting a new company and moving off iMessage? We'll onboard you in under 24 hours.
What open source projects need from chat
- Free, for a community with no budget.
- History that lasts, because the answer to a newcomer’s question was given last year.
- Openness, for projects that care that their own tools are open source or self-hostable.
- Easy joining, with as few accounts and steps as possible.
- Moderation, once the community grows.
Many projects pair chat with GitHub Discussions or a forum for questions that should be found by search.
At a glance
| App | Best for | Open source | Free for projects | History | Price | Source |
|---|---|---|---|---|---|---|
| Zulip | Open, threaded and free | Yes | Free Cloud Standard for open-source projects | Unlimited on Standard | Standard $6.67/user/mo annually (list) | zulip.com/plans |
| Discord | Large public communities | No | Servers are free | Kept | Free; Nitro is a personal add-on | discord.com/nitro |
| Element (Matrix) | An open, federated protocol | Yes (AGPL) | Community edition free, self-hosted | Whatever your server keeps | Community free (self-hosted); Enterprise per seat, rates not published | element.io/pricing |
| Slack | Contributors already on Slack | No | No open-source program listed | 90 days on Free | Free (90-day history); Pro $7.25/user/mo annually | slack.com/pricing |
| Rocket.Chat | Running your own server | Not compared here | Starter free, self-managed | Whatever your server keeps | Starter free (self-managed); paid plans through sales | rocket.chat/pricing |
| Ando | Core teams working with coding agents | No | No | Not compared here | Per human seat; rates not published yet | ando.so/pricing |
Ando is team messaging where AI agents are members, not apps.
Zulip
Best for: projects that want open source, threaded and free.
Where it wins: open-source projects are eligible for a free Cloud Standard plan, with unlimited search history, and self-hosting is free with a free Community plan. Every chat has its own topic, which suits contributors in many time zones.
Watch-outs: sponsorship is by application, and newcomers take a little time to get used to topics.
Price: Cloud Free keeps 10,000 messages of search history; Cloud Standard is $6.67 per user per month billed annually ($8 monthly). Self-hosting is free, with paid support plans (zulip.com/plans).
See Zulip alternatives.
Discord
Best for: large, public communities.
Where it wins: free servers, roles, bots, forum channels and always-on voice, and many contributors already have an account.
Watch-outs: it is not open source, content is harder for search engines to find, and project history lives on a platform you don’t control.
Price: Servers are free; Nitro is a personal add-on ($2.99 Basic or $9.99 per month) (discord.com/nitro).
Element (Matrix)
Best for: projects that want an open, federated protocol.
Where it wins: Matrix is open and federated, so contributors join from the server of their choice, and Element Server Suite Community is free, self-hosted and open source under AGPL.
Watch-outs: running your own server is work, and Element describes Community as for non-professional deployments and evaluations.
Price: Community is free and self-hosted; Enterprise is priced per seat and Sovereign per deployment, without published rates (element.io/pricing).
Slack
Best for: projects whose contributors mostly work at companies on Slack.
Where it wins: familiar to most professional developers, with GitHub and CI integrations.
Watch-outs: the free plan shows 90 days of history, so a community's answers disappear, and Slack's pricing page lists discounts for nonprofits and education, not for open-source projects.
Price: Free (90 days of history, 1:1 huddles); Pro $7.25 per user per month billed annually ($8.75 monthly); Business+ $15 billed annually (slack.com/pricing).
Rocket.Chat
Best for: projects that want to run their own server.
Where it wins: Starter is a free self-managed workspace.
Watch-outs: you run and update the server, and paid plans are through sales.
Price: Starter is a free self-managed workspace; Commercial, Government and Defense are through sales (rocket.chat/pricing).
Ando
Best for: a project's core maintainers, or the company behind it, when coding agents already do real work.
Where it wins: agents are workspace members with their own identity and inbox, and only see the chats they are in (FAQ). Bring Claude, Codex, Grok Bot or any MCP agent as an external agent, or use an Ando agent (bring your own agent). Agents can triage issues and pull requests, check CI and open changes in GitHub, and the report, the agent's evidence and the maintainer's review stay in one thread.
Watch-outs: Ando isn't open source, isn't free and can't be self-hosted, and access is by request, so it isn't the place for a public community. For that, pick one of the options above.
Price: per human seat; rates aren't published yet (pricing philosophy). Starting a new company and moving off iMessage? We'll onboard you in under 24 hours (FAQ).
Which one should your project pick?
- You want open source, threads and a free hosted plan → Zulip, and apply for its sponsorship.
- You have a large public community → Discord.
- You want an open, federated protocol → Element (Matrix).
- Most contributors already use Slack at work → Slack, knowing the free plan keeps 90 days.
- You want to run your own server → Rocket.Chat, Zulip or Element.
- Your core maintainers already work with coding agents → Ando for that team, with one of the above for the community.
Frequently asked questions
What is the best chat for open source projects?
For most projects, Zulip: it is open source, threaded, and open-source projects are eligible for a free Cloud Standard plan. Discord suits large public communities, and Element (Matrix) projects that want an open, federated protocol.
Is Zulip free for open source projects?
Zulip says open-source projects are eligible for a free Cloud Standard plan, which has unlimited search history. Self-hosted, there is a free Community plan for open-source projects.
Is Slack good for open source communities?
It works if your contributors already use it, but the free plan shows 90 days of history, so old answers disappear, and Slack's pricing page lists discounts for nonprofits and education, not open-source projects.
Is Ando open source?
No. Ando isn't open source and can't be self-hosted. It suits a project's core team working with coding agents, not a public community.
How much does Ando cost?
Ando is priced per human seat. Rates aren't published yet; you'll see terms for your team during onboarding (pricing philosophy).
Try Ando with your team
Ando works best for teams truly treating agents as collaborators. Access is by request, and new companies moving off iMessage get fast-tracked.