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Twenty
Free (self-hosted) / Managed hosting (TBA)4.7/5
Modern open-source CRM backed by Y Combinator with full customization.
Why founders use Twenty
Custom contact and company objects
Customizable pipelines
Activity timeline
Task management
Notes and rich text
Email integration
Custom data model
API and webhooks
Permission management
The Good
Completely open source (GPL license)
Full control over data and customization
No vendor lock-in
Modern tech stack (TypeScript, React, NestJS)
Active developer community (300+ contributors)
The Bad
Self-hosting requires technical knowledge
Still in beta phase (features still being built)
Smaller ecosystem than mature CRMs
Limited built-in integrations
The Verdict
Twenty is a GPL-licensed, open-source CRM from Y Combinator-backed founders who previously built for Airbnb. It offers the simplicity of modern SaaS (like Notion) with the ownership and extensibility of open source. For indie hackers and developers, this means zero vendor lock-in, full data control, and the ability to customize anything.\n\nWith 20,000+ GitHub stars, a thriving developer community, and features like custom data models, API-first architecture, and webhooks, Twenty is perfect for technical founders who want their CRM to integrate seamlessly into their entire product ecosystem.