Proton Mail provides secure email services with end-to-end encryption, ensuring data protection. Swiss-based and outside US jurisdiction, it offers a free version to champion privacy as a human right. Fully accessible on any device.
Switzerland
+9
Open Source Gmail AlternativesTop WebMail Providers & Email Clients like Gmail
The best open source alternative to Gmail is Proton Mail. If that doesn't suit you, our users have ranked more than 100 alternatives to Gmail and many of them is open source so hopefully you can find a suitable replacement. Other interesting open source alternatives to Gmail are Tuta Mail, Disroot, Posteo and Infomaniak kMail.
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Most Gmail alternatives are WebMail Providers, but you can also narrow the list to Email Clients or Calendar Apps. Other popular filters are Free, Open Source, Android, EU and Linux. You can also filter for EU-based alternatives if you prefer software from the European Union.
Alternatives list
- 118 Proton Mail alternatives
118 Tuta Mail alternativesOffers comprehensive encryption for email, calendar, and contacts with zero personal info required. Built on open source, install via Play Store, F-Droid, or APK, with Tor and VPN support. Both free and paid plans; utilizes quantum-resistant encryption ensuring privacy-focused, anonymous usage.
Germany
EU
49 Disroot alternativesDisroot is a platform providing online services based on principles of freedom, privacy, federation and decentralization.
Netherlands- EU
86 Posteo alternativesWeb- and IMAP-based email service. 4GB cost 1€/month. Information is hosted on encrypted hard drives. Electricity from renewable resources is used.
- Germany
- EU
+9
55 Infomaniak kMail alternativesPrivacy-focused Swiss email system provides 20 GB free storage, supports custom domains and unlimited storage, syncs contacts and calendars, is ad-free, and is part of a secure productivity suite used by over a million users across Europe on all devices.
- Switzerland
+8
Email that feels like texting — a free, open-source iOS and iPadOS email client that renders every thread as a conversation of bubbles. No backend, no account.
United States
Kolab Now provides a suite of intuitive apps in a user friendly environment to make your day to day online comms easier, smarter and most importantly; secure.
- Switzerland
10 Aster Mail alternativesAster Mail is private, encrypted email that's free to use. Your mail is encrypted before it's stored, so nobody at Aster can read it, scan it, or show you ads based on it.
- United States
+8
Cloudflare Workers-based email solution providing multiple address generation, attachment storage via R2, responsive web interface, RBAC management, Resend bulk email, Telegram or third-party forwarding, verification code recognition, and ECharts analytics.
China
+1
49 Forward Email alternativesForward Email is the best email service, encrypted email service, and fastest email service. It supports unlimited domains and aliases for no extra cost. It uses quantum safe ChaCha20-Poly1305 encryption and offers SMTP, IMAP, POP3, email webhooks, email regular expressions...
- United States
42 Horde alternativesEnterprise-level, browser-based suite for IMAP email, calendar, contacts, tasks, notes, wiki, and file management, offering syncing, shared and unlimited resources, multilingual support, customizable dashboard, and integration with mobile and external clients.
10 MailCraft alternativesThis is an open-source, clean-room mail, calendar and contacts program in pure Rust, for Microsoft 365, Outlook.com and IMAP. Early alpha.
United Kingdom
+1
