Free & Open Source Gmail Alternatives in 2025
A curated collection of the 1 best free & open source alternatives to Gmail.
The best free & open source alternative to Gmail is Zero.
Gmail alternatives are mainly Artificial Intelligence but may also be Email. Browse these narrower lists of alternatives if you're looking for the same functionality as Gmail.
Zero
An innovative open source email application that reimagines communication with built-in privacy features and modern user experience.
Zero is revolutionizing email communication by combining traditional reliability with cutting-edge features and privacy-first design. This open source email client offers:
Smart Organization Features:
- Intelligent categorization of emails into Primary, Important, Personal, Updates, and Promotions
- Clean, modern interface for effortless navigation
- Visual indicators for message priority and threading
Privacy and Security Focus:
- Built from the ground up with privacy protection
- Open source codebase for transparency and community trust
- Enhanced security features for sensitive communications
Modern User Experience:
- Intuitive design that makes email management effortless
- Seamless integration with existing email providers
- Smart filtering and organization tools to keep your inbox clean
The platform has already attracted over 5,000 waitlist subscribers, demonstrating strong interest in its innovative approach to email management. Zero represents the next evolution in email communication, offering users complete control over their digital correspondence while maintaining the highest standards of privacy and security.
