Ltt.rs - JMAP Email client

Installs

3.5k

Rating

4.0

Rating count

< 100

Category	Communication
Developer	Daniel Gultsch
Price	0.49
First release	2/26/2020 (5 years ago)
Version	0.4.3
In-app purchases	No
Contains ads	No
Content rating	Everyone
Package name	rs.ltt.android

View on Play Store

Core Metrics

Data Breakdown

Date	Rating Count	Average Rating	Installs	Version
6/23/2025	50	4.000	3,514	0.4.3
6/22/2025	0	0.000	3,513	0.4.3
6/17/2025	0	0.000	3,511	0.4.3
6/14/2025	0	0.000	3,510	0.4.3
6/13/2025	0	0.000	3,510	0.4.3
6/9/2025	0	0.000	3,509	0.4.3
6/8/2025	0	0.000	3,507	0.4.3
5/29/2025	0	0.000	3,506	N/A
5/22/2025	0	0.000	3,498	N/A
4/10/2025	0	0.000	3,485	N/A
4/6/2025	0	0.000	3,484	N/A

Details

Ltt.rs (pronounced Letters) is a proof of concept email (JMAP) client currently in development. It makes heavy use of Android Jetpack for a more maintainable code base than some of the preexisting Android email clients.

To use Lttrs you need a JMAP (JSON Meta Application Protocol) capable mail server!

Features & Design considerations:

· Heavily cached but not fully offline capable. Ltt.rs makes use of JMAP’s great caching capabilities. However actions, such as marking a thread as read, need a round-trip to the server until their consequences like unread count are updated. Ltt.rs will ensure that the action itself won’t get lost even if performed while momentarily offline.
· No settings aside from account setup. Settings invite feature creep and make the app hard to maintain. Ltt.rs aims to support one specific work flow. Users who desire a different work flow may find K-9 Mail or FairEmail more suitable.
· Minimal external dependencies. Third party libraries are often of poor quality and end up being unmaintained. Therfore we will only rely on well known, well tested libraries from reputable vendors.
· Autocrypt as a first class feature¹. With its strict UX guidelines autocrypt fits right into Ltt.rs.
· Ltt.rs is based on jmap-mua, a headless email client, or a library that handles everything an email client would aside from data storage and UI. There is also lttrs-cli which uses the same library.
· When in doubt: Look at Gmail for inspiration.

¹: Planned feature

Ltt.rs is licensed under the Apache License 2.0. The source code is available on Codeberg: https://codeberg.org/iNPUTmice/lttrs-android

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