Rocket.Chat
Rocket.Chat is building for the air-gapped enterprise, and adding an AI layer on the way
Comparison · Comms
Mailu vs Signal Desktop
A side-by-side editorial comparison of Mailu and Signal Desktop — release velocity, themes, recent moves, and the top alternatives to consider.
Mailu vs Signal Desktop: at a glance
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.
What is Signal Desktop?
Signal's beta train is quietly handing group admins real moderation powers.
Signal Desktop ships a beta roughly every week, and the last two months have gone almost entirely into group administration and message lifecycle. Admins can now end a group outright, delete other members' recent messages, and call events inherit disappearing-message settings. The most recent two betas are pure maintenance, suggesting the feature batch has landed and is being stabilized.
Mailu vs Signal Desktop: editorial side-by-side
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.
Signal Desktop
5.0COMMS
Signal's beta train is quietly handing group admins real moderation powers.
◆ Current state
Signal Desktop ships a beta roughly every week, and the last two months have gone almost entirely into group administration and message lifecycle. Admins can now end a group outright, delete other members' recent messages, and call events inherit disappearing-message settings. The most recent two betas are pure maintenance, suggesting the feature batch has landed and is being stabilized.
◆ Where it's heading
The pattern across v8.17 through v8.20 is consistent: Signal is filling in the social-coordination features that group chats on other platforms already have, without touching its encryption story. Polls moved from groups into one-to-one chats, pinned chats went from 4 to 10, sticker packs became reorderable. These are retention features for people who run their social logistics inside Signal rather than treating it as a secure side channel.
◆ Prediction
Expect the current beta cycle to converge on a stable v8.x release with the group-admin set intact, and further small quality-of-life limits raised. The entries do not indicate what the next feature batch targets.
Alternatives to Mailu and Signal Desktop
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 Mailu or Signal Desktop.
Chatwoot
Chatwoot added voice, then pointed its AI agent at the tickets it already resolved.
Roundcube
After four years, Roundcube 1.7 lands — and the release stream is otherwise all CVEs
Notion
Notion is turning itself into the place other companies' agents come to work.
Slack
Slack's app platform is being rebuilt around agents, with the SDKs clearing old ground behind it.
Bird
Monthly digests showing AI chat latency cut hard, in a feed that repeats itself
See all Mailu alternatives → · See all Signal Desktop alternatives →
Recent activity from Mailu and Signal Desktop
Latest ship moves from both products, interleaved chronologically. ⚡ = editorial spark.
- 1d agoSignal DesktopMaintenance beta: bug fixes only
- 5d agoMailuAutoconfig fix for modern K-9 Mail
- 7d agoMailuRoundcube 1.6.17 closes two CVEs
- 8d agoSignal DesktopStabilization beta: tweaks and performance
- 12d agoMailuSets X-Forwarded-By in response to a GHSA advisory
- 15d agoSignal DesktopCall events now disappear with the chat's timer
- 21d agoSignal DesktopAdmins can end a group and lock it down
- 26d agoMailuAdmin UI keeps form values on failed submit
- 29d agoSignal DesktopPolls come to one-on-one chats
- 1mo agoMailuEscapes sieve fields, fixing autoreplies with special characters
- 1mo agoSignal DesktopGroup admins can delete others' recent messages
- 2mo agoMailuRoundcube 1.6.16 and carddav 5.1.3 close CVE-2026-49217
Frequently asked questions
What is the difference between Mailu and Signal Desktop?
They serve adjacent needs but don't currently overlap on shipped themes. Mailu and Signal Desktop are shipping at a similar cadence (velocity 5.0 vs 5.0, both within Sparkpulse's "active" band). See the at-a-glance table above for a side-by-side breakdown of velocity, recent sparks, and editorial themes.
Is Mailu better than Signal Desktop?
Sparkpulse doesn't pick a winner — we score release velocity, not feature parity. Mailu and Signal Desktop are shipping at a similar cadence (velocity 5.0 vs 5.0, both within Sparkpulse's "active" band). For your specific use case, the alternatives sections above list other Comms products to evaluate alongside.
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.
What are the best alternatives to Signal Desktop?
Top Signal Desktop alternatives in Comms are ranked by recent ship velocity. Browse the "Signal Desktop alternatives" section above for the current picks, or visit /alternatives/signal-desktop for the full list with editorial commentary on each.