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Comparison · Comms
Subsplash vs Mailu
A side-by-side editorial comparison of Subsplash and Mailu — release velocity, themes, recent moves, and the top alternatives to consider.
Subsplash vs Mailu: at a glance
| Feature | Subsplash | Mailu |
|---|---|---|
| Sector | Comms | Comms |
| Velocity score | 6.3 | 5.0 |
| Sparks · 30d | 1 | 0 |
| Top themes | church-management, workflow-automation, natural-language-query, analytics | self-hosted-email, docker, security-patches, roundcube |
| Last editorial update | 19h ago | 1h ago |
| Website | — | Visit → |
What is Subsplash?
Subsplash is turning its church dashboard from a record of activity into something that acts.
Subsplash runs a broad church-operations platform — giving, people, events, groups, media and now workflows — and the last quarter has been about layering analysis and automation over that data. Trends AI landed in March as a chart-and-dashboard layer with AI analysis; People Assistant followed in May with natural-language filtering of the congregation; Workflows left beta in July with step-triggered email included for Subsplash One clients. Around those, the window is steady administrative work: group member limits, dashboard registration, an Events Manager role.
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.
Subsplash vs Mailu: editorial side-by-side
Subsplash
6.3COMMS
Subsplash is turning its church dashboard from a record of activity into something that acts.
◆ Current state
Subsplash runs a broad church-operations platform — giving, people, events, groups, media and now workflows — and the last quarter has been about layering analysis and automation over that data. Trends AI landed in March as a chart-and-dashboard layer with AI analysis; People Assistant followed in May with natural-language filtering of the congregation; Workflows left beta in July with step-triggered email included for Subsplash One clients. Around those, the window is steady administrative work: group member limits, dashboard registration, an Events Manager role.
◆ Where it's heading
Two arcs are converging. One makes the data answerable without a spreadsheet or a filter builder; the other makes the platform take action on it, starting with email at a workflow step. Bundling Workflows into Subsplash One instead of pricing it separately says the automation is meant to be table stakes for the top tier and a reason to climb into it — and the AI features carry the same 'talk to your CSM' gate. The administrative releases are the tell that this is a platform serving operators, not enthusiasts.
◆ Prediction
Email is the only action a workflow step can currently take, and Subsplash already owns the church's app and its messaging surfaces — push or SMS from a workflow step is the near-term extension, alongside pointing People Assistant's plain-language filters at who enters a workflow in the first place.
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 Subsplash 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 Subsplash or Mailu.
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
Signal Desktop
Signal's beta train is quietly handing group admins real moderation powers.
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.
See all Subsplash alternatives → · See all Mailu alternatives →
Recent activity from Subsplash and Mailu
Latest ship moves from both products, interleaved chronologically. ⚡ = editorial spark.
- 1d agoSubsplashBe notified by email when a Workflow Card is complete
- 5d agoMailuAutoconfig fix for modern K-9 Mail
- 7d agoMailuRoundcube 1.6.17 closes two CVEs
- 12d agoMailuSets X-Forwarded-By in response to a GHSA advisory
- 14d agoSubsplashIntroducing Group Member Limits + Group Finder Improvements
- 16d agoSubsplashEmail Automations for Workflows ⚡
- 22d agoSubsplashRegister Guests & Waive Payments from Dashboard
- 26d agoMailuAdmin UI keeps form values on failed submit
- 1mo agoSubsplashMedia and Campaign Data in Trends AI
- 1mo agoMailuEscapes sieve fields, fixing autoreplies with special characters
- 2mo agoMailuRoundcube 1.6.16 and carddav 5.1.3 close CVE-2026-49217
- 2mo agoSubsplashPeople Assistant: AI-Powered Filtering ⚡
Frequently asked questions
What is the difference between Subsplash and Mailu?
They serve adjacent needs but don't currently overlap on shipped themes. Subsplash is currently shipping more aggressively (velocity 6.3 vs 5.0), with 1 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 Subsplash better than Mailu?
Sparkpulse doesn't pick a winner — we score release velocity, not feature parity. Subsplash is currently shipping more aggressively (velocity 6.3 vs 5.0), with 1 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 Subsplash?
Top Subsplash alternatives in Comms are ranked by recent ship velocity. Browse the "Subsplash alternatives" section above for the current picks, or visit /alternatives/subsplash 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.