Jack Dorsey's Block launches Buzz, an AI-native Slack rival

Jack Dorsey's payments company Block has launched Buzz, a workplace collaboration platform designed to accommodate both human team members and AI agents in shared conversations. The tool represents a direct challenge to Slack's market position, according to details first reported by TechCrunch.

Buzz combines group chat functionality with native GitHub project management and AI agent integration. The platform allows development teams to collaborate with automated assistants in the same workspace where they coordinate with human colleagues, eliminating the need to switch between multiple applications.

Open source and self-hosted

Block built Buzz as an open-source project, giving teams full access to the source code. Organizations can customize their Buzz instances to match specific workflows and security requirements. The model-agnostic architecture means teams aren't locked into a single AI provider.

Dorsey described the platform as "decentralized" and "self-sovereign" in his announcement on X, emphasizing user control over data and infrastructure. Desktop applications are now available for macOS, Windows, and Linux, with the codebase published on GitHub.

Why it matters

The emergence of AI agents as workplace tools creates friction in existing collaboration platforms. Teams currently juggle separate interfaces for human communication, AI interactions, and code management. Buzz addresses this fragmentation by consolidating these functions, though the platform acknowledges it remains in "early stages." For startups building AI-first workflows from the ground up, native agent integration could prove more practical than retrofitting legacy tools. Established teams on Slack face higher switching costs.

Growing competition in AI-native collaboration

Buzz enters a nascent but growing category. Paradigm partner Georgios Konstantopoulos released Centaur in May 2026, an open-source "virtual employee" that operates within Slack or via API. Konstantopoulos emphasized the enterprise need for self-hosted solutions that provide security and control while extending beyond basic coding tasks.

The competitive landscape suggests established players like Slack face pressure to deepen AI capabilities or risk losing ground to purpose-built alternatives. Block's resources and Dorsey's track record building communication platforms give Buzz credibility, though adoption will depend on execution and feature maturity.

Block operates Square, Cash App, Afterpay, and Tidal alongside its new collaboration tool. The company's involvement signals Buzz is more than an experimental side project, though the platform's early-stage status means teams should evaluate carefully before migrating critical workflows.

TechCrunch first reported the Buzz launch on July 21, 2026.