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Ltt.rs

Simple and maintainable Android e-mail client
New in version 0.4.4
* Bundle Letsencrypt for older Android versions
Proof of concept e-mail (JMAP) client (pronounced \"Letters\"). Makes heavy use of Android Jetpack to be more maintainable than some of the other Android e-mail clients.

Features, and design considerations:

* Heavily cached, but not fully offline capable. Ltt.rs makes use of JMAP’s great caching capabilities. However, marking a thread as read does a round-trip to the server to update things such as read count. The action itself won’t get lost even if performed offline.
* Account setup and done. Settings invite feature creep and its friend unmaintainability. There is one specific work flow. K-9 Mail or FairEmail is more suitable for others.
* Minimal dependencies. Only widely known, highly tested libraries from reputable vendors. Third-party libraries are often of poor quality, and end up unmaintained.
* First class Autocrypt. Ltt.rs fits right into its strict UX guidelines.
* Based on jmap-mua, a headless e-mail client, or a library that handles everything an e-mail client would, aside from data storage and UI. There is also lttrs-cli, which uses the same library.
* Looks to Gmail for inspiration in cases of uncertainty.

Versions

Although APK downloads are available below to give you the choice, you should be aware that by installing that way you will not receive update notifications and it's a less secure way to download. We recommend that you install the F-Droid client and use that.

Download F-Droid
  • Version 0.4.4 (19) suggested Added on Apr 13, 2025

    This version requires Android 6.0 or newer.

    It is built and signed by the original developer, and guaranteed to correspond to this source tarball.

    Permissions

    Download APK 7.3 MiB PGP Signature | Build Log

  • New in version 0.4.3
    * Enable predictive back gestures
  • Version 0.4.3 (18) - Added on Jan 11, 2024

    This version requires Android 6.0 or newer.

    It is built and signed by the original developer, and guaranteed to correspond to this source tarball.

    Permissions

    Download APK 7.3 MiB PGP Signature | Build Log

  • New in version 0.4.2
    * Restore access to fastmail.com
    * Fix issue with notifications not showing
  • Version 0.4.2 (17) - Added on Dec 25, 2023

    This version requires Android 6.0 or newer.

    It is built and signed by the original developer, and guaranteed to correspond to this source tarball.

    Permissions

    Download APK 7.2 MiB PGP Signature | Build Log