4 Open Source Alternatives to Gmail

Inbox Zero cleans up your inbox in minutes by allowing bulk unsubscriptions, smart filtering, and AI-driven email assistance. Enjoy features such as Reply Zero for focusing on emails that need replies, a cold email blocker, and detailed analytics to monitor your email activity. The privacy-first approach is validated by Google approval, and you also have the option to self-host. Pricing plans include options with premium AI assistance and basic unsubscriber features to suit your needs.

Tuta delivers secure communication by encrypting your emails, calendars, and contacts using post-quantum cryptography. Its zero-knowledge architecture and user-friendly design simplify workflows across web, mobile, and desktop platforms. With support for custom domain integration and multi-user options, Tuta provides a reliable, sustainable platform powered entirely by renewable energy.

UnInbox transforms traditional email by offering shared spaces that let teams comment on and manage conversations from shared addresses. The tool features per-email workflow tracking to ensure tasks are completed and provides limitless custom email addresses for various team functions. Its intuitive design and transparent pricing cater to businesses of all sizes, making email communication efficient and collaborative.

Mailspring offers seamless integration with multiple email accounts, a unified inbox, and advanced search capabilities that make finding messages swift and easy. The client features customizable signature creation, touch and gesture support, intelligent translation, and spell check, all built on a streamlined C++ core that uses less memory and improves battery life. Advanced Pro features further empower users with read receipts, link tracking, scheduling tools, and enriched contact profiles.