The best open source alternative to Close is Odoo. If that doesn't suit you, we've compiled a ranked list of other open source Close alternatives to help you find a suitable replacement. Other interesting open source alternatives to Close are: Twenty, ERPNext, Krayin, and Erxes.
Close alternatives are mainly CRM Systems but may also be ERP Systems or Marketing Automation Tools. Browse these if you want a narrower list of alternatives or looking for a specific functionality of Close.
Comprehensive ERP solution offering integrated modules for finance, HR, sales, inventory, and more, tailored for businesses of all sizes.

Odoo is a powerful, open-source business management platform that revolutionizes how companies operate. This versatile suite of applications seamlessly integrates various business functions, providing a unified solution for organizations across industries.
Key benefits of Odoo include:
Whether you're managing finances, streamlining operations, or boosting sales, Odoo provides the tools you need to succeed in today's competitive business landscape.
Looking for open source alternatives to other popular services? Check out other posts in the alternatives series and openalternative.co, a directory of open source software with filters for tags and alternatives for easy browsing and discovery.
Open-source CRM platform for efficient customer data management, collaboration, and relationship nurturing

Twenty is a cutting-edge, open-source CRM platform designed to revolutionize how businesses manage customer relationships. Built with modern technologies and a user-centric approach, Twenty empowers teams to streamline their workflows and make data-driven decisions.
Key benefits of Twenty include:
Whether you're a startup looking for a scalable solution or an enterprise seeking to optimize customer relationships, Twenty provides the tools and flexibility to elevate your CRM experience. Join the growing community of businesses that trust Twenty to drive growth and nurture lasting customer connections.
Open-source ERP solution offering modules for accounting, inventory, HR, CRM, and more. Customizable and scalable for businesses of all sizes.

ERPNext is a powerful, open-source business management platform designed to streamline operations across your entire organization. This versatile solution offers a comprehensive suite of modules that cater to various aspects of your business, including:
What sets ERPNext apart is its flexibility and customizability. The platform can be tailored to fit the unique needs of businesses across different industries and sizes, from small startups to large enterprises. Key benefits include:
By centralizing your business operations on a single platform, ERPNext helps improve efficiency, reduce errors, and provide valuable insights for data-driven decision-making.
Open source customer relationship management platform with sales tracking, marketing automation, and customizable workflows for businesses of all sizes.

Krayin CRM is a powerful open-source solution that helps businesses manage their entire customer lifecycle. Built on Laravel, it offers robust features including lead tracking, deal management, and sales forecasting to optimize your sales process.
Key capabilities include:
The platform supports various industries from B2B to real estate, with industry-specific customizations available. Being self-hosted, it provides complete control over your data while offering enterprise-grade security features.
All-in-one solution for marketing, sales, and customer service. Boost engagement, streamline workflows, and drive growth.

Erxes is a powerful, open-source growth platform designed to help businesses of all sizes excel in marketing, sales, and customer service. By centralizing customer interactions and data, Erxes enables teams to work more efficiently and deliver exceptional experiences.
Key benefits of Erxes include:
With its intuitive interface and robust feature set, Erxes empowers teams to collaborate seamlessly, make data-driven decisions, and foster lasting customer relationships. Whether you're a startup or an enterprise, Erxes provides the tools you need to thrive in today's competitive business landscape.
All-in-one solution for ERP, CRM, HRM, ATS, and project management to streamline your business operations

Ever Gauzy Platform is a powerful open-source business management solution that combines multiple essential tools into one comprehensive package. This versatile platform integrates:
Key benefits:
Ever Gauzy Platform empowers businesses to operate more efficiently, make data-driven decisions, and foster better collaboration across departments. Whether you're a small team or a large corporation, this comprehensive solution provides the tools you need to succeed in today's competitive business landscape.
Looking for open source alternatives to other popular services? Check out other posts in the alternatives series and openalternative.co, a directory of open source software with filters for tags and alternatives for easy browsing and discovery.
A flexible and customizable CRM platform for managing contacts, deals, and customer relationships without the complexity or user-based pricing of traditional solutions.

Frappe CRM delivers a refreshingly simple approach to customer relationship management. Built as an open-source solution, it provides all essential features without overwhelming complexity:
As an open-source platform with no per-user fees, Frappe CRM enables businesses to scale their sales operations without rising software costs or vendor lock-in.
Open-source CRM software for managing customers, companies, projects and opportunities. Intuitive interface with cloud and self-hosted options available.

Complete customer relationship management in one intuitive platform. Track and manage all your business relationships - from individual contacts and companies to projects and sales opportunities - through a clean, user-friendly interface.
Key features include:
Trusted by 50,000+ companies across 163 countries, this mature platform has been refined over 11 years of development. Whether you're a small business or enterprise, the software scales to meet your needs while maintaining simplicity.
Available as both cloud and on-premise solutions, giving you complete control over your data and deployment preferences. The open-source nature ensures transparency, security, and the ability to customize according to your specific requirements.
Build a customizable CRM that matches your company's vision, designed for developers and loved by end users.

Atomic CRM is an open-source toolkit that empowers developers to build tailored customer relationship management solutions. With a focus on flexibility and customization, it offers:
Essential CRM features: Contact organization, task management, note-taking, data import/export, deal tracking, and activity history.
Advanced capabilities: Enterprise authentication, Kanban board, email-to-note conversion, contact avatar enrichment, and API integration.
Code-driven flexibility: Customize theming, swap components, leverage TypeScript, add custom pages, and extend the data model to fit your specific needs.
Built on a modern tech stack including React, React-admin, TypeScript, Material UI, Supabase, and Postgres, Atomic CRM provides a solid foundation for creating powerful, scalable CRM solutions.
Key benefits:
Atomic CRM is free and open-source, making it an excellent choice for businesses looking to develop a custom CRM solution without the limitations of proprietary software.
Transform customer relationships with this intuitive open-source CRM. Features task management, sales pipeline tracking, and customizable data models.

Relaticle revolutionizes customer relationship management with a modern, open-source approach that puts control back in your hands. Built on cutting-edge technologies including PHP 8.3 and Laravel 12, this platform delivers enterprise-grade functionality without the enterprise price tag.
Key Features:
Why Choose Relaticle:
Perfect for businesses seeking a flexible, cost-effective CRM solution that doesn't sacrifice functionality for freedom.