Hydrogen
Dormant unmaintainedA lightweight, embeddable Matrix web client by Element with broad browser support; marked obsolete on matrix.org.
web · licence AGPL-3.0-only OR LicenseRef-Element-Commercial
- Web
- Last commit
- Nov 2025 12 months ago · 6 Nov
- Commits, last year
- 1 0 in 90 days
- Authors, 90 days
- 0 1 in a year, 35 ever
- Bus factor
- 1 authors making half of last year's commits
- Last release
- sdk-v0.3.1 21 Oct 2024 · 0 tags in a year
- Lines of code
- 55k TypeScript
AI
AI policy
What the project says about AI-made contributions
Restricted (fits the chosen stance)(against the chosen stance)“Contributions are judged on their content, not on how they were produced. AI-assisted contributions are accepted; unreviewed AI output is not. [...] If your PR was made with the help of AI, you must convey that this is the case using the PR template.”
AI in development
Whether the developers use AI tools on the repository
None found (fits the chosen stance)(against the chosen stance)Collector: 0 of 1 commits in the last year credit an AI tool (0.0 %). 0 agent files, 0 AI workflows. A lower bound: most AI use leaves no trace.
- 1 commit in the last 365 days; no agent files.
AI in the product
Whether the product itself has AI features
None found (fits the chosen stance)(against the chosen stance)Activity
Languages
Apps
| OS | Built with | Status | Minimum OS | Where to get it |
|---|---|---|---|---|
| pwa | discontinued | not stated | web |
Features
| Feature | Value | How we know | Evidence |
|---|---|---|---|
| SDK | own (Hydrogen's own SDK, also published as hydrogen-view-sdk) | code | github.com/element-hq/hydrogen-web/blob/ea5976e4 |
| Encryption (E2EE) | Yes: Yes | claimed | github.com/matrix-org/matrix.org/blob/041599b0dc |
| Cross-signing | Not found: Not found | — | — |
| Key backup | Not found: Not found | — | — |
| Sliding sync | Not found: Not found | — | — |
| Next-gen auth (OIDC) | Not found: Not found | — | — |
| Multiple accounts | Yes: Yes | claimed | github.com/matrix-org/matrix.org/blob/041599b0dc |
| Threads | No: No | claimed | github.com/matrix-org/matrix.org/blob/041599b0dc |
| Spaces | No: No | claimed | github.com/matrix-org/matrix.org/blob/041599b0dc |
| 1:1 calls | Not found: Not found | — | — |
| Group calls | Not found: Not found | — | — |
| Reactions | Not found: Not found | — | — |
| Edits | Not found: Not found | — | — |
| Replies | Not found: Not found | — | — |
| Polls | Not found: Not found | — | — |
| Custom emoji | Not found: Not found | — | — |
| Stickers | Not found: Not found | — | — |
| Location | Not found: Not found | — | — |
| Voice messages | Not found: Not found | — | — |
| Rich text editor | Not found: Not found | — | — |
| URL previews | Not found: Not found | — | — |
| Push notifications | Not found: Not found | — | — |
| Private read receipts | Not found: Not found | — | — |
| Presence | Not found: Not found | — | — |
| Room upgrades | Not found: Not found | — | — |
| Moderation tools | Not found: Not found | — | — |
| Accessibility | not-found | — | — |
| Translations | yes | claimed | github.com/matrix-org/matrix.org/blob/041599b0dc |
| Telemetry | Not found: Not found | — | — |
| Default homeserver | not-found | — | — |
| Fork-friendliness | yes Small codebase meant to be embedded (Chatrix builds on it). | claimed | github.com/element-hq/hydrogen-web/blob/ea5976e4 |
Health signals
- Bus factor (last year)
- 1
- Issue first response
- not measured (the forge did not give it)
- Release cadence
- 0 tags in the last year, latest sdk-v0.3.1 (21 Oct 2024)
- CI
.github/workflows/codechecks.js.yml.github/workflows/docker-publish.yml.github/workflows/sdk-release.js.yml- Tests
- test files found
- Security policy
- none found
- Licence
- AGPL-3.0-only OR LicenseRef-Element-Commercial
- Funding
- none listed
- Telemetry SDKs in manifests
- none found
Repositories
| Repository | Role | Activity | Last commit | Commits 1y | Authors 90d | Measured at |
|---|---|---|---|---|---|---|
| github.com/element-hq/hydrogen-web | main | Dormant | 6 Nov 2025 | 1 | 0 | ea5976e40 |
Notes
matrix.org maturity: Obsolete. AI policy: Element's organisation-wide policy (element-meta PR 3393, 2026-11-02) covers element-hq repositories, including this one. The repo was relicensed on 2025-01-17 (LICENSE-AGPL-3.0 and LICENSE-COMMERCIAL); matrix.org still lists Apache-2.0, the earlier licence.
Researched by an AI agent (Claude) on 5 Nov 2026, not checked by a person; metrics collected on 5 Nov 2026. Source file: data/projects/client/hydrogen.yaml. Spotted a mistake? Open an issue with a link.