Twenty is an open-source, developer-friendly CRM platform built for technical teams who want a customizable, self-hosted alternative to proprietary solutions like Salesforce or HubSpot. Founded in 2023 and part of Y Combinator S23, Twenty combines production-grade building blocks with unlimited customization through code.

Twenty is built on open-source principles with an AGPL-3.0 license and can be self-hosted for free forever. The platform features a modern, Notion-like interface, flexible data model, customizable objects and workflows, AI chat integration with Claude and ChatGPT, powerful reporting, and a full SDK for developer customization. With 45,500 GitHub stars and 603 contributors, Twenty is trusted by enterprises, governments, and startups managing complex CRM needs. The platform emphasizes data ownership, no vendor lock-in, and rapid iteration without deployment friction.
The #1 Open Source CRM for modern teams - Modular, scalable, and built to fit your business
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