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Comparison · Comms
Converse.js vs Mailu
A side-by-side editorial comparison of Converse.js and Mailu — release velocity, themes, recent moves, and the top alternatives to consider.
Converse.js vs Mailu: at a glance
What is Converse.js?
Converse.js 14 lands OMEMO:2 — the browser XMPP client catches up on modern encryption.
Converse.js reached 14.0.0 in June 2026 after a tight beta train, and the release is defined by one thing: support for OMEMO:2, the current revision of XMPP's end-to-end encryption. The surrounding work is all encryption ergonomics — per-chat encryption state remembered across chat-close and re-login, an explicit error surfaced for undecryptable messages instead of silently dropping them, the toggle hidden on untrusted devices, and original filenames preserved on encrypted image download. New PubSub API methods for create, subscribe and unsubscribe round out the release.
What is Mailu?
A mail server whose entire visible output is patching other people's code.
Mailu is a self-hosted mail suite shipped as a Docker compose stack, and the 2024.06.x branch shown here is its maintenance line. Every release in the window is a single-issue patch — a Roundcube bump, a CVE fix, an autoconfig tweak. The cadence looks high at ten pinned releases in five months, but each carries one change.
Converse.js vs Mailu: editorial side-by-side
Converse.js
0.0COMMS
Converse.js 14 lands OMEMO:2 — the browser XMPP client catches up on modern encryption.
◆ Current state
Converse.js reached 14.0.0 in June 2026 after a tight beta train, and the release is defined by one thing: support for OMEMO:2, the current revision of XMPP's end-to-end encryption. The surrounding work is all encryption ergonomics — per-chat encryption state remembered across chat-close and re-login, an explicit error surfaced for undecryptable messages instead of silently dropping them, the toggle hidden on untrusted devices, and original filenames preserved on encrypted image download. New PubSub API methods for create, subscribe and unsubscribe round out the release.
◆ Where it's heading
The project is closing the gap between having encryption and having usable encryption. Almost every OMEMO change in this cycle is about failure modes users previously had to guess at: a silently dropped message, an encryption toggle offered where it cannot work, an abandoned bundle that never self-healed. That is the work a client does when its encryption is no longer a demo but something people depend on daily. Dropping client-compress for native browser APIs points the same way — fewer bundled dependencies in a security-sensitive path.
◆ Prediction
Expect the 14.x line to settle into interoperability fixes as OMEMO:2 meets other XMPP clients in the wild, with the new PubSub API the most likely base for the next feature layer.
Mailu
5.0COMMS
A mail server whose entire visible output is patching other people's code.
◆ Current state
Mailu is a self-hosted mail suite shipped as a Docker compose stack, and the 2024.06.x branch shown here is its maintenance line. Every release in the window is a single-issue patch — a Roundcube bump, a CVE fix, an autoconfig tweak. The cadence looks high at ten pinned releases in five months, but each carries one change.
◆ Where it's heading
Most of what Mailu ships is downstream maintenance of its bundled components, Roundcube above all, which drove three of these ten releases. The project's own work here is defensive: escaping user-controlled fields in generated sieve scripts, setting X-Forwarded-By, adapting to Microsoft's new autodiscover. This is a product in steady-state operation, where the release notes track what upstream broke rather than what Mailu decided to build.
◆ Prediction
The next pinned release will most likely be another Roundcube or Alpine bump, since component upgrades triggered half the releases here. These entries say nothing about what is happening on the main branch.
Alternatives to Converse.js and Mailu
Other Comms products tracked by Sparkpulse, ranked by recent ship velocity. Each card links to a full editorial trajectory and lets you pivot into a head-to-head comparison with either Converse.js or Mailu.
Stalwart
Stalwart keeps chasing standards nobody has implemented yet — DKIM2, DMARCbis, now JMAP email push.
Maddy
A one-binary mail server learning to behave like production infrastructure.
Friendica
Friendica keeps betting on being the fediverse node that speaks everyone else's protocols.
diaspora
The original federated social network now ships roughly once every two years.
mailcow
Six releases, and every one of them is a security update in some form.
See all Converse.js alternatives → · See all Mailu alternatives →
Recent activity from Converse.js and Mailu
Latest ship moves from both products, interleaved chronologically. ⚡ = editorial spark.
- 8d agoMailuAutoconfig fix for modern K-9 Mail
- 10d agoMailuRoundcube 1.6.17 closes two CVEs
- 15d agoMailuSets X-Forwarded-By in response to a GHSA advisory
- 29d agoMailuAdmin UI keeps form values on failed submit
- 1mo agoMailuEscapes sieve fields, fixing autoreplies with special characters
- 1mo agoConverse.jsOMEMO:2 encryption support ships in Converse 14 ⚡
- 1mo agoConverse.jsOMEMO bundle self-healing and new PubSub API methods
- 1mo agoConverse.jslibomemo.js dependency bump
- 1mo agoConverse.jsclient-compress replaced with native browser APIs
- 1mo agoConverse.jsFirst beta carrying the OMEMO usability fixes
- 2mo agoMailuRoundcube 1.6.16 and carddav 5.1.3 close CVE-2026-49217
- 2mo agoConverse.jsReaction attribution and MUC JID parsing fixes
Frequently asked questions
What is the difference between Converse.js and Mailu?
They serve adjacent needs but don't currently overlap on shipped themes. Mailu is currently shipping more aggressively (velocity 5.0 vs 0.0), with 0 editorial sparks in the last 30 days against 0. See the at-a-glance table above for a side-by-side breakdown of velocity, recent sparks, and editorial themes.
Is Converse.js better than Mailu?
Sparkpulse doesn't pick a winner — we score release velocity, not feature parity. Mailu is currently shipping more aggressively (velocity 5.0 vs 0.0), with 0 editorial sparks in the last 30 days against 0. For your specific use case, the alternatives sections above list other Comms products to evaluate alongside.
What are the best alternatives to Converse.js?
Top Converse.js alternatives in Comms are ranked by recent ship velocity. Browse the "Converse.js alternatives" section above for the current picks, or visit /alternatives/converse-js for the full list with editorial commentary on each.
What are the best alternatives to Mailu?
Top Mailu alternatives in Comms are ranked by recent ship velocity. Browse the "Mailu alternatives" section above for the current picks, or visit /alternatives/mailu for the full list with editorial commentary on each.