Aster Mail vs PreVeil

Aster Mail is an open-source email service with a free plan and paid tiers. It supports web, desktop, and Android, with an iOS beta on TestFlight; native desktop apps are available for Windows, Mac, and Linux. Aster Bridge lets desktop mail apps connect over IMAP and SMTP. Mail between Aster accounts is automatically end-to-end encrypted and uses hybrid post-quantum encryption. The free plan costs nothing and includes 10 GB of encrypted storage, five aliases, one custom domain, two mail rules, attachments up to 25 MB per message, and Bridge access; no trial or credit card is required. Aster says its email is hosted in Germany under EU privacy law and that it does not use ads, inbox scanning, or AI on the inbox. QuickSwitch imports mail from Gmail, Outlook, Yahoo, Proton, and other IMAP providers. MBOX mailbox export is free on every plan. Paid plans start at $2.42 a month, billed annually, with the final amount determined at checkout. Aster Mail was founded in 2026 and is headquartered in Orlando, Florida, United States.

PreVeil provides end-to-end encrypted email and file sharing for defense and regulated industries. PreVeil Drive stores and shares encrypted files, with controls for viewing, editing, and commenting. Email works with Outlook, Gmail, Apple Mail, browsers, and mobile devices; Drive integrates with Windows File Explorer and Mac Finder, and is also available in a browser and iOS and Android apps. PreVeil says data is encrypted on users’ devices and only recipients can decrypt it. It replaces passwords with cryptographic keys and uses Approval Groups to distribute administrative trust among multiple approvers. The company says its platform is designed to support CMMC, NIST SP 800-171, ITAR, DFARS, HIPAA, the FTC Safeguards Rule, and CJIS requirements. Data subject to DFARS, CMMC, or ITAR is stored in AWS GovCloud in the U.S.; other data is stored in AWS Commercial Cloud. A free Basic plan includes 5 GB of encrypted storage. Paid plans include Individual at $25 a month, requiring annual payments, and Business at $30 a month per user, with monthly billing available.