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Letro iOS
Letro iOS is a modified version of Element X iOS, the next-generation Matrix client developed by Element (Element Creations Ltd. / New Vector Ltd.). It is distributed by Letro Tech GmbH via Apple's App Store under the name "Letro".
This repository is published as the corresponding source for the Letro iOS binary, in compliance with the GNU Affero General Public License, version 3 (AGPLv3) §6.
Relationship to upstream
- Upstream project: https://github.com/element-hq/element-x-ios
- Upstream baseline used by this fork: see
UPSTREAM_VERSION - Letro modifications, with dates, serving as the AGPLv3 §5(a)
modification notice for the work as a whole: see
FORK_DIVERGENCE.md
Upstream technical documentation — build instructions, contributor setup, architecture notes — applies unchanged. See the upstream README.
Status
This repository tracks the production source for the Letro iOS app. Issues and bug reports specific to the Letro fork should be filed here; issues that reproduce against upstream Element X iOS belong upstream.
Copyright
Copyright (c) 2026 Letro Tech GmbH <legal@letro.com> -- modifications
The upstream copyright lines (Element Creations Ltd., New Vector
Ltd., and the other upstream contributors) are preserved verbatim
in the source files and in LICENSE, as required by
AGPLv3. Letro does not claim authorship of upstream code; the parts
modified by Letro are identified in
FORK_DIVERGENCE.md.
License
This software is dual-licensed by Element Creations Ltd. ("Element"):
- for free under the GNU Affero General Public License, version 3 or (at your option) any later version (AGPLv3); or
- under a paid Element Commercial License agreement between you and Element.
Letro distributes this fork under option (1), AGPLv3. The full
licence texts are in LICENSE and
LICENSE-COMMERCIAL. Letro's own modifications
are likewise licensed under AGPLv3.
Third-party components
Letro iOS bundles third-party components under their own licences,
including the Matrix Rust SDK (Apache-2.0), MapLibre (BSD-2-Clause),
Compound Design Tokens (AGPLv3), and the further Swift Package Manager
dependencies resolved in Package.resolved. A consolidated
attribution list is published at
THIRD_PARTY_LICENSES.md and mirrored
in-app under Settings → About → Acknowledgements.
Trademarks
"Matrix" is a trademark of The Matrix.org Foundation C.I.C.
"Element" and "Element X" are trademarks of Element Creations Ltd. / New Vector Ltd.
"Apple" and "App Store" are trademarks of Apple Inc.
Letro is not affiliated with, endorsed by, or sponsored by The Matrix.org Foundation, Element, or Apple Inc. References to "Matrix", "Element" and the other names above in this repository's source, documentation, history and configuration are made solely to identify the upstream protocol and the upstream project from which Letro is derived, as permitted by nominative fair use.
Contact
Legal / licensing questions: legal@letro.com Operating entity / imprint: see https://www.letro.com/imprint