Aster Mail vs. Fastmail Comparison


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About Aster Mail is a free, open-source, end-to-end encrypted email service for people who want real privacy without the technical overhead. All encryption happens on your device before anything reaches our servers, so we have zero access to your messages or metadata. Aster uses standard OpenPGP with portable RSA-4096 keys, so you're never locked in. Your keys work with GPG, Thunderbird, or any PGP client, and they're discoverable through WKD and public keyservers. Aster-to-Aster messages use a Signal-inspired X3DH and Double Ratchet protocol for forward secrecy. Every plan includes encrypted email, custom domain support, free aliases, tracker protection, and full access across web and desktop. The entire codebase is published under AGPL v3 on GitHub, fully auditable, with a public warrant canary and documented vulnerability disclosure. Free plan includes 10 GB encrypted storage, 5 aliases, and 1 custom domain. Paid plans start at $2.99/month. Servers located in Germany.	About Email you can feel good about. features you’ll love. You get 100% of our efforts and expert support when you need it. Email holds the details of your life. Here, your story is protected, not monetized. Thoughtful and speedy email, calendars, and contacts; all ad-free. Built with you in mind, you’ll love our intelligent features. Internet companies use your data as a way to get rich. But it doesn’t have to be this way. Take back your privacy and get a better email experience. With your email on your side, you spend more time doing what you love. Use Fastmail in your web browser, on mobile devices, and on desktop apps (Outlook, Thunderbird, Mac Mail). Breeze through your day with email, calendars, and contacts all in one app. Seamlessly import your data. Keep your life organized with a full-featured inbox. Bring all your calendars together. Share with your favorite people. Use your custom domain, and own your email address forever.
Platforms Supported Windows Supported Mac Supported Linux Supported Cloud Supported On-Premises Not Supported iPhone Supported iPad Supported Android Supported Chromebook Supported	Platforms Supported Windows Not Supported Mac Not Supported Linux Not Supported Cloud Supported On-Premises Not Supported iPhone Supported iPad Supported Android Supported Chromebook Not Supported
Audience Privacy-conscious users	Audience Anyone that wants an ad-free and secure email service provider
Support Phone Support Not Supported 24/7 Live Support Not Supported Online Supported	Support Phone Support Not Supported 24/7 Live Support Not Supported Online Supported
API Offers API Not Supported	API Offers API Not Supported
Screenshots and Videos No images available	Screenshots and Videos View more images or videos
Pricing No information available. Free Version Supported Free Trial Not Supported	Pricing $3 per user per month Free Version Not Supported Free Trial Supported
Reviews/Ratings Overall 0.0 / 5 ease 0.0 / 5 features 0.0 / 5 design 0.0 / 5 support 0.0 / 5 This software hasn't been reviewed yet. Be the first to provide a review: Review this Software	Reviews/Ratings Overall 4.0 / 5 ease 5.0 / 5 features 4.0 / 5 design 5.0 / 5 support 5.0 / 5 Read all reviews
	Pros & Cons from Real Users Pros Easy to use. Email Masking. Integration with other email providers. 30GB of storage. can use your own domain. Cons Doesn't have proper email encryption. Doesn't allow you to encrypt emails with passwords.
Training Documentation Supported Webinars Not Supported Live Online Not Supported In Person Not Supported	Training Documentation Supported Webinars Not Supported Live Online Not Supported In Person Not Supported
Company Information Aster Mail Founded: 2025 United States astermail.org	Company Information Fastmail Founded: 1999 Australia www.fastmail.com
Alternatives CounterMail	Alternatives Proton Mail Proton AG
IBIK ASTER	Greatmail
Atomic Mail	Amazon WorkMail Amazon
Letterbox	Thunderbird Mozilla Foundation
Proton Mail Proton AG View All	IceWarp View All
Categories Email Clients Supported Email Encryption Supported Email Hosting Supported	Categories Email Clients Supported Email Hosting Supported Email Management Supported

Integrations 1Password Not Supported All-in-One Messenger Not Supported Franz Not Supported GroupNews Not Supported Joplin Not Supported Keeper.sh Not Supported MailRoute Not Supported Mailspring Not Supported Microsoft Outlook Not Supported Postbox Not Supported Pronnel Not Supported Remindlo Not Supported SavvyCal Not Supported Shopify Not Supported SimplyMeet.me Not Supported Stackreaction Not Supported Thunderbird Not Supported Unibox Not Supported UserSketch Not Supported ZOOK Email Backup Not Supported Show More Integrations	Integrations 1Password Supported All-in-One Messenger Supported Franz Supported GroupNews Supported Joplin Supported Keeper.sh Supported MailRoute Supported Mailspring Supported Microsoft Outlook Supported Postbox Supported Pronnel Supported Remindlo Supported SavvyCal Supported Shopify Supported SimplyMeet.me Supported Stackreaction Supported Thunderbird Supported Unibox Supported UserSketch Supported ZOOK Email Backup Supported Show More Integrations View All 22 Integrations
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