xmatic

Native Matrix client built on matrix-rust-sdk with a Silica UI.

FEATURES

- Sliding sync, end-to-end encryption, cross-signing, device verification, key backup and recovery
- Rooms, spaces (nested), direct chats, threads, room directory search
- Create rooms, invite, leave; member list and profiles with moderation
- Send, edit, delete, reply and paginate in encrypted rooms
- Search a conversation; the index stays on the device, the query never leaves it
- Formatted messages, pinned messages, favourites, low priority, mute, ignore list
- A line marks where reading stopped, and who has read what
- Four coloured lines for backup, recovery, cross-signing and local storage
- Reactions from a picker whose first tab you fill yourself *
- Pictures, files, sharing, share target from Gallery and file manager
- Voice messages; voice and video calls (classic 1:1 VoIP)
- Notifications, offline send queue, encrypted local storage
- Optional push notifications, off by default
- OAuth (MAS), device-code and password sign-in
- 29 interface languages, switchable in the app

LANGUAGES

The 24 official languages of the European Union plus Russian, Norwegian,
Icelandic, Simplified Chinese and Hindi. German is the project language and
Norwegian came from a Norwegian speaker; the rest are machine translations,
usable but unchecked. The language is set in the app and applies at the next
start.

Corrections are welcome at the repository below: translations/harbour-xmatic-
<language>.ts, and translations/STATUS.md says which have been read.

LOCAL STORAGE

Session tokens and the message database are encrypted with a key from Sailfish
Secrets. Without that key service nothing is written at all: the app says what
is missing and how to install it. A database that predates the key can be
re-created encrypted from the encryption page, which costs one sign-out and
your recovery key.

WHY IS THE PACKAGE SO BIG?

The complete Matrix stack ships statically: matrix-rust-sdk, E2EE, sliding
sync, rustls, an HTTP runtime and SQLite. None of it exists as a system library
here, and Qt 5.6 is too old for the C++ alternatives. Installed ~60 MB,
RPM ~18 MB.

NO BACKGROUND DAEMON

Messages arrive while the app is running; the cover is enough. A closed app
does not receive, unless push notifications are switched on.

ARCHITECTURES

aarch64 (Sailfish OS 5.0+), armv7hl (Sailfish OS 4.6+), tested on J2, X10III and Gemini PDA.

REQUIREMENTS

Your homeserver must support simplified sliding sync (MSC4186), the same
mechanism Element X uses. To check, open
        https://YOUR-SERVER/_matrix/client/versions
and look for "org.matrix.simplified_msc3575": true

Sign-in: OAuth 2.0 / Matrix Authentication Service, device code, or username
and password on servers without OAuth. The SSO redirect (SAML, CAS) is not
supported.

* REACTIONS

By default, reactions are drawn as monochrome text characters. Sailfish ships the Twitter Color Emoji font (Twemoji), but Qt on Sailfish renders only its black-and-white outlines — always correct, just colourless.
If you prefer colourful emoji, you can use any emoji image set, for example Twemoji as SVG images: unpack it into your Downloads or Public folder and import it under Account → Appearance (at the very bottom).
During the import xmatic runs a small security check on every picture and copies the set into its own storage (under the app's data directory), recording a SHA-256 checksum per picture — each image is verified against it before it is shown. Your unpacked folder is not needed afterwards. "Remove the emoji pack" deletes only xmatic's own copy, never the folder you imported from.
Nothing is bundled and nothing is downloaded by the app itself.

Written with Claude Code (Anthropic), icons included; the protocol core is
upstream matrix-rust-sdk.

Source, issues, releases:
https://github.com/JimKnopfIoT/harbour-xmatic