
# What is Mercur? Mercur is the first truly limitless open source marketplace platform that combines the simplicity of SaaS with the freedom of open source. Built on [MedusaJS](https://github.com/medusajs/medusa), it empowers businesses to create custom marketplaces without choosing between ownership and ease of use. Mercur is a platform to start, customize, manage, and scale your marketplace for every business model with a modern technology stack. ## Announcing Mercur 1.0 After months of development, testing, and close collaboration with early adopters, we’re excited to announce the official release of **Mercur 1.0** - the first truly limitless marketplace platform. Version 1.0 is fully open source and ready to be self-hosted, giving you **full control over infrastructure, customizations, and data**. With this version, **Mercur is production-ready for B2C marketplaces**. The first complete version includes a vendor system, admin panel, and a fully built B2C Storefront. Read more in **[official release announcement](https://www.mercurjs.com/updates/mercur-1-0-release)** ## Why Choose Mercur? - Full Ownership: Unlike SaaS platforms, you own your marketplace with no transaction fees or vendor lock-in - Modern Foundation: Built on MedusaJS, offering a modern tech stack that developers love - Beautiful by Default: Create stunning storefronts without sacrificing customization ## Power Any Marketplace Model - Custom B2B Marketplace: Build enterprise-grade platforms with specialized workflows - Custom B2C Marketplace: Create engaging consumer marketplaces with modern UX - eCommerce Extension: Transform your store into a marketplace (coming soon)  # Ready-to-go marketplace features Storefronts for Marketplace