Mobile app · Internet & communication

Aster Mail: Encrypted Email

Private email app with end-to-end encryption, aliases, and custom domains.

Free, with trade-offs
Android
Open source
No account

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Geographic availability: No geographic restriction found in our sources; availability is not checked country by country.

Technical details

Pricing: Free, with trade-offsconfirmed by F-Droid, GitHub
License: AGPL-3.0+ — Open source (copyleft)confirmed by F-Droid, GitHub
Open source: Yes
Commercial use: Yesconfirmed by F-Droid, GitHub
Account required: Noconfirmed by GitHub
Credit card required: Noconfirmed by F-Droid, GitHub
Watermark: Not applicable
Ads: No
Platforms: AndroidEstablished by Android: F-Droid
Publisher: Aster Communications Inc.
Latest version: 1.0.19 (9 November 2026)
Latest activity: 9 November 2026
Source code: github.com/Aster-Privacy/Aster-Mail

Overview

Aster Mail: Encrypted Email is an email client, available on Android.

Features described in its F-Droid listing: end-to-end encryption.

Overview written by LicitPro from the documentation published by the authors and the cited sources; we have not tried the resource ourselves.

Excerpts that establish this information

“Cross-platform encrypted email client for Aster” — GitHub, 10 November 2026
“Private email app with end-to-end encryption, aliases, and custom domains” — F-Droid, 10 November 2026
“Import and export your aliases” — F-Droid, 10 November 2026
“Two-factor authentication and a recovery key” — F-Droid, 10 November 2026
“Push notifications are delivered through any UnifiedPush-compatible distributor, such as ntfy.” — F-Droid, 10 November 2026
“Paid plans add storage, larger attachments, more aliases, and custom domains.” — F-Droid, 10 November 2026

At a glance

Aster Mail: Encrypted Email is free, with trade-offs: it relies on a non-free online service.

Its licence (AGPL-3.0+) is a copyleft open source licence: you may use, study, modify and redistribute it, including commercially; modified versions must keep the same licence.

Strengths

Open source code
No account needed
No advertising
Commercial use allowed

Weaknesses

Flagged by F-Droid: relies on a non-free online service

Sources and checks

Facts collected from F-Droid (credit card, source code, publisher, licence, free status, platforms, ads, commercial use, version) — 9 November 2026
Facts collected from GitHub (credit card, account, source code, publisher, licence, free status, platforms, commercial use) — 9 November 2026
Last technical check: 6 November 2026
Description from F-Droid — F-Droid (citation courte)

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