open source★ 26kactive aug 2026

Zulip

Email-shaped topics inside team chat; excellent for async work and merciless about naming conversations.

Visit zulip.com ↗Source code ↗

Technical Profile & Specs

Cost: $0 / forever (Open Source)
Platforms: desktopmobilewebself-hostedself-host, real ops

Replaces 5 paid apps

up to $48.74/mo ($585/yr) in subscriptions

Mattermost Professional👥 community$10/mo Compare Mattermost Professional vs Zulip →

Microsoft Teams🛠️ dev tools$19/mo Compare Microsoft Teams vs Zulip →

Pumble👥 community$2.99/mo Compare Pumble vs Zulip →

Slack Pro👥 community$8.75/mo Compare Slack Pro vs Zulip →

Twist👥 community$8/mo Compare Twist vs Zulip →

Zulip FAQ

Common questions

Is Zulip free and open source?+

Zulip is an open-source tool. Email-shaped topics inside team chat; excellent for async work and merciless about naming conversations.

What paid software does Zulip replace?+

Zulip serves as a free replacement for 5 paid SaaS applications: Mattermost Professional, Microsoft Teams, Pumble, Slack Pro, Twist, saving up to $48.74/month ($585/year) in subscription bills.