Zulip

What Zulip does

Zulip is a 100% open-source team chat application that uses a topic-based threading model to organize asynchronous conversations, in contrast to the channel-based approach used by Slack and Microsoft Teams. The product was originally developed at Dropbox and spun off in 2015; the commercial entity, Kandra Labs, Inc. (d/b/a Zulip), is headquartered in San Francisco and transitioned ownership to the Zulip Foundation, a nonprofit, in May 2026. The company operates with a globally distributed team of approximately 15 employees and has remained bootstrapped, having never raised venture capital; non-dilutive funding includes two NSF grants totaling $975,000 in 2017 and 2018. The platform serves thousands of organizations globally, with strong adoption among open-source projects (Rust, Asciidoctor, Rush Stack, Mixxx), universities and research institutions (TUM, UCSD, National University of Córdoba, Recurse Center), and small-to-mid-sized businesses (End Point Dev, iDrift AS, Semsee, WindBorne, Atolio, GUT contact). Customer use cases emphasize organized async communication for distributed teams and organizations with data sovereignty requirements.

Zulip's core technology is a Python/Django backend with PostgreSQL, exposed through a stable REST API and a Python-based bot framework, with native clients for desktop (Windows, Mac, Linux), mobile (iOS, Android with end-to-end encrypted push notifications), web, and terminal. The platform supports SAML SSO, SCIM, AD/LDAP, OAuth, and integrations with Slack, Microsoft Teams, Mattermost, Rocket.Chat, Matrix, Zoom, Jitsi, Sentry, and Zapier/IFTTT. The product surface is delivered through two distribution models: Zulip Cloud (a hosted SaaS with Free, Standard $7/user/month, Plus $10/user/month, and custom Enterprise tiers) and Zulip Server (self-hosted open-source software with paid support plans at $4-$7/user/month). Compliance posture includes GDPR, CCPA, and self-hosting-facilitated HIPAA and FERPA alignment.

The business model is recurring subscription revenue across both cloud and self-hosted support tiers, combined with a freemium funnel (Free tier up to 10 users) and an enterprise sales-assisted motion for larger organizations requiring custom contracts and SLAs. Go-to-market is product-led and community-led, relying on documentation, GitHub presence, organic developer social channels (Mastodon, LinkedIn, X), and targeted use cases such as universities, events, conferences, and open-source communities. The company releases major server versions roughly twice yearly, with the most recent release (Zulip Server 12.0) shipping in April 2026.

Name

Zulip

Legal name

Kandra Labs, Inc.

Website

https://zulip.com

Company type

Private

Founded year

2015

Operating status

Operating

Headcount range

11–50 employees

Short description

Zulip is an open-source team chat platform that uses topic-based threading to organize asynchronous conversations. It serves thousands of organizations globally, including universities, research institutions, open-source projects, and distributed SMBs, via cloud and self-hosted deployments.

Ownership category

akta.pro rank

Product category

Team Collaboration Software

NAICS

Computing Infrastructure Providers, Data Processing, Web Hosting, and Related Services (5182)

SIC

Services-Prepackaged Software (7372), Services-Computer Programming, Data Processing, Etc. (7370)

akta.pro primary industry

Email, Calendar & Scheduling (BPAMAMAC)

Keywords

• Team chat software
• Open source messaging
• Self-hosted collaboration
• Async team communication
• Topic-based threading

Headquarters

HQ city

San Francisco

HQ country

United States

HQ region

North America

Offices1 record

Markets served

GTM type

B2B

Offering type

Software

Cost components

Personnel, Technology or R&D, Infrastructure, Operations, Marketing or Sales

Revenue model

1. Cloud Subscription (Zulip Cloud): Hosted cloud service with tiered subscription plans (Free, Standard, Plus, Enterprise) based on user count and feature access. Recurring monthly or annual subscription revenue.
2. Self-hosted Server Plans: Organizations can self-host using Zulip's open-source software with optional support contracts and upgrade pricing tiers.

Pricing tiers

Go-to-market motion2 records

Distribution channels3 records

Marketing channels7 records

Core offering

Zulip is an open-source team chat application built around topic-based threading, enabling asynchronous and organized conversations for distributed teams. It is offered as a managed cloud service (Zulip Cloud) and as self-hosted software (Zulip Server) that organizations can deploy on their own infrastructure for full data sovereignty. The product is complemented by native desktop, mobile, web, and terminal clients, a REST API, a Python bot framework, and an end-to-end encrypted mobile push notification service.

Product overview

Zulip is an organized team chat application built as 100% open-source software, available as both a cloud-hosted service (Zulip Cloud) and self-hosted software (Zulip Server). The product portfolio centers on the core chat platform with topic-based threading for asynchronous communication, complemented by native client applications for desktop (Windows, Mac, Linux), mobile (iOS, Android), web browser, and terminal. Developer-facing offerings include a REST API for building custom integrations and a Python-based Bot Framework for interactive bots. The Zulip Mobile Push Notification Service handles encrypted push delivery to mobile devices. All plans receive the same open-source software, with cloud and self-hosted options differing only in hosting and support.

Differentiator

Problem solved

Functional benefit

Products and services

• Zulip Cloud Managed SaaS team chat service operated by the Zulip core team, providing automatic updates, minimal downtime, and human support. Available in Free, Standard, Plus, and Enterprise tiers.
• Zulip Server (Self-hosted) 100% open-source self-hosted team chat software that organizations deploy on their own infrastructure for full data sovereignty, available as Free, Basic, Business, and Enterprise plans with varying support levels.
• Zulip Desktop App Native desktop client for Windows, macOS, and Linux providing full Zulip functionality with native performance and system integration.
• Zulip Mobile App Native mobile applications for iOS and Android with end-to-end encrypted push notifications for mobile alerts.
• Zulip Web App Browser-based web application accessible from any modern browser without installation.
• Zulip Terminal App Command-line terminal application for users who prefer a terminal-based interface to Zulip.
• Zulip REST API Comprehensive REST API enabling developers to build custom integrations, bots, and automate workflows; supports custom webhooks, outgoing webhooks, interactive bots framework, and user provisioning.
• Zulip Bot Framework Python-based framework for building interactive bots that react to messages in Zulip, with supporting tools such as zulip-bot-shell for testing bot output.
• Zulip Mobile Push Notification Service Hosted service that delivers encrypted push notifications to Zulip mobile apps on iOS and Android; free for up to 10 users on self-hosted deployments.

Named customers14 records

Segments4 records

Ideal customer profiles4 records

Technology focussed Yes

API detail

Has API

Yes

API docs

API detail

Core technology

AI maturity

App detail

Integration25 records

Feature3 records

Scale indicators1 record

Recent moves7 records

Expansion highlights5 records

Direct peers

• Mattermost: Mattermost is the closest direct peer: open-source team chat offered as both self-hosted and cloud, targeting engineering and DevOps-heavy organizations with similar compliance and self-hosting value propositions. Zulip and Mattermost frequently appear together on shortlists for self-hosted Slack alternatives.
• Rocket.Chat: Rocket.Chat is an open-source team chat and customer-engagement platform with self-hosted, cloud, and hybrid deployment options, directly comparable to Zulip on data sovereignty, customization, and developer integrations. It competes head-to-head in OSS chat evaluations.
• Element (Matrix): Element, built on the Matrix open protocol, offers federated, end-to-end encrypted team chat with self-hosting, overlapping Zulip's privacy-first and open-source positioning. Both serve security-conscious enterprises, governments, and OSS communities.
• Flock: Flock is a SaaS team chat and collaboration product aimed at SMB and mid-market businesses, sharing Zulip's per-seat subscription model and target buyer. A relevant direct comparison point on commercial GTM and pricing for similar feature sets.
• Symphony Communication Services: Symphony is an enterprise messaging and workflow platform serving regulated industries (finance, compliance), with strong self-hosting and compliance posture that mirrors Zulip's regulated-vertical pitch and self-hosted architecture.
• Wire: Wire is an end-to-end encrypted team messaging product with self-hosting and enterprise compliance focus, directly comparable to Zulip on security-first positioning, regulated verticals, and open-source-adjacent governance.

Broad incumbents

• Slack: Slack (owned by Salesforce) is the dominant proprietary team chat incumbent that Zulip directly targets as a displacement alternative, with a native Slack import tool and frequent customer testimonials about abandoning Slack for Zulip's topic model.
• Microsoft Teams: Microsoft Teams is the largest bundled team chat product, distributed via Microsoft 365, and the other primary displacement target for Zulip — with a native Teams import tool and case-study evidence of organizations switching from Teams to Zulip.
• Discord: Discord serves the community, OSS, and creator use cases that overlap heavily with Zulip's "Open Source & Communities" segment, and is increasingly used inside companies as a lightweight team chat. Comparable in audience even if not in enterprise positioning.
• Zoom Team Chat: Zoom Team Chat is bundled within Zoom's communications platform and increasingly used as a unified chat+video alternative to Slack/Teams; Zulip integrates with Zoom, Jitsi, and BigBlueButton, reflecting direct competition for unified-communications buyers.

Market position

Strengths3 records

Weaknesses5 records

Competitive moat4 records

Key risks7 records

Key highlights7 records

Customer concentration

• Xx.com/Zulip
• GitHubgithub.com/zulip
• LinkedInlinkedin.com/company/zulip-by-kandra-labs

Compliance4 records

Revenue estimate

Valuation estimate

Number of profiles

Profiles1 record

Funding overview

Funding rounds2 records

Investors1 record

Funding detail is available on the Subscription and Enterprise plan.Contact sales →

M&A

Investments

M&A and investment is available on the Subscription and Enterprise plan.Contact sales →

Frequently asked questions about Zulip