Instead of Aster Mail
Aster Mail alternatives
Aster Mail’s core offer is encrypted email with a free entry point and support across web, desktop, Android, and iOS beta. Mail between Aster accounts is encrypted automatically with hybrid post-quantum encryption. The free plan gives 10 GB of encrypted storage, five aliases, one custom domain, and Bridge access for desktop IMAP and SMTP apps. QuickSwitch imports mail from several providers, and mailbox export in MBOX format is free on every plan. Paid plans begin at $2.42 per user per month when billed annually, adding storage, aliases, domains, and mail rules.
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Disroot Email
by Disroot EmailFree plan Open source AndroidExtensioniPhone+4Free webmail and broad email-client access — Unlike Aster’s automatic end-to-end encryption between its accounts, Disroot provides email through Roundcube webmail and desktop or mobile clients without end-to-end encryption.
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Proton Mail
by Proton MailFree plan WebWindowsMac+3Email with an encrypted calendar — Proton Mail adds an encrypted calendar, while Aster does not offer one.
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eclipso Mail Europe
Free plan AndroidAPIiPhone+4Email with a broad set of built-in tools — eclipso combines email with cloud storage, calendar, contacts, tasks, notes, fax, SMS, and online post-office tools, unlike Aster’s email-focused offer.
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PreVeil
Free plan AndroidExtensioniPhone+3Encrypted email and file sharing for regulated work — PreVeil combines end-to-end encrypted email with file sharing and access controls, whereas Aster focuses on email and offers no listed file-sharing service.
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Riseup Email
Free plan AndroidiPhoneLinux+3Activists who can get an invite — Riseup offers free email with IMAP and POP access but requires an invite code and provides 1 GB, versus Aster’s open free signup and 10 GB.
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DeoMail
Free plan Web - 12
MailZyro
Free plan ExtensionWeb - 13
Secria Mail
Free plan AndroidiPhoneWeb - 14
Shutbox
Free plan AndroidAPIWeb - 15
Tau Mail
Free plan AndroidiPhoneWeb - 16
VibeMail
Free plan AndroidAPIiPhone+1 - 17
4SecureMail
Free trial AndroidiPhoneLinux+3 - 18
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Private-Mail
Paid AndroidiPhoneLinux+3 - 23
Typewire
Free trial AndroidiPhoneWeb - 24
Aster may not suit readers who want an encrypted calendar: it does not offer one. Its iOS app is in beta on TestFlight, and its free attachments are capped at 25 MB per message. Alternatives vary in client access, extra services, encryption, storage, and account requirements; Riseup, for example, requires an invite code and offers 1 GB. Before switching, compare the platforms and protocols you need, storage and domain priorities, and whether additional tools or signup conditions matter more than Aster’s features and price.