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Comparison · Comms
grommunio vs Stalwart
A side-by-side editorial comparison of grommunio and Stalwart — release velocity, themes, recent moves, and the top alternatives to consider.
grommunio vs Stalwart: at a glance
What is grommunio?
grommunio's feed publishes release pointers only; the changes themselves live on GitHub.
The crawled feed carries twelve release-note stubs spanning August 2021 to June 2026, each the same 134-character sentence directing readers to GitHub for the detailed logs. Version 2026.06.1 is the most recent. Nothing in the feed states what changed in any release, so the platform's current capability surface cannot be read from this source.
What is Stalwart?
SCIM v2 lands in the Enterprise tier, opening a provisioning surface beside the protocol work.
Stalwart ships weekly, and 0.16.20 breaks a long run of pure spec-completeness work by adding SCIM v2 to the Enterprise tier: core schema (RFC 7643), protocol (RFC 7644), cursor-based pagination (RFC 9865), the SCIM interoperability profile and the IPSIE lifecycle profile. The rest of the release is the established mix - conference links in calendar invites and alarms, 25 interface translations, and a fix run covering DANE lookup and failure semantics, Redis Sentinel deployments where rediss:// URLs connected to the master in cleartext, and cluster node leases that left removed nodes marked stale indefinitely.
grommunio vs Stalwart: editorial side-by-side
grommunio
0.0COMMS
grommunio's feed publishes release pointers only; the changes themselves live on GitHub.
◆ Current state
The crawled feed carries twelve release-note stubs spanning August 2021 to June 2026, each the same 134-character sentence directing readers to GitHub for the detailed logs. Version 2026.06.1 is the most recent. Nothing in the feed states what changed in any release, so the platform's current capability surface cannot be read from this source.
◆ Where it's heading
The only signal available is cadence, and it is thin and irregular: twelve published notes across roughly five years, with 2023.11.x, 2025.01.x and 2026.06.1 as the visible markers. That is a release-notes page maintained as an index rather than a changelog. Reading direction from grommunio would require the GitHub logs these notes point at.
◆ Prediction
Expect the next entry to be another dated pointer of the same form. Whether grommunio's real release cadence matches this feed cannot be determined from what is published here.
Stalwart
6.3COMMS
SCIM v2 lands in the Enterprise tier, opening a provisioning surface beside the protocol work.
◆ Current state
Stalwart ships weekly, and 0.16.20 breaks a long run of pure spec-completeness work by adding SCIM v2 to the Enterprise tier: core schema (RFC 7643), protocol (RFC 7644), cursor-based pagination (RFC 9865), the SCIM interoperability profile and the IPSIE lifecycle profile. The rest of the release is the established mix - conference links in calendar invites and alarms, 25 interface translations, and a fix run covering DANE lookup and failure semantics, Redis Sentinel deployments where rediss:// URLs connected to the master in cleartext, and cluster node leases that left removed nodes marked stale indefinitely.
◆ Where it's heading
The protocol gap-closing continues, with DANE, iMIP, CalDAV and JMAP absorbing corrections every release, but SCIM points at a different axis: who is expected to deploy this. Provisioning, per-tenant branding, cluster lease handling and the recovery-admin impersonation fixes are operator concerns rather than mail-standard concerns, and they have been accumulating since 0.16.15. Calendar remains the least settled surface, now extending into localization rather than correctness alone.
◆ Prediction
SCIM shipped with the interoperability and IPSIE profiles attached, so the near-term work is likely the directory-side corrections that follow first contact with real identity providers - the same pattern the LDAP and SQL directory integrations have been producing. The 25 new translations open a localization surface that has not yet had to survive a release cycle.
Alternatives to grommunio and Stalwart
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 grommunio or Stalwart.
Synapse
Synapse publishes only a changelog link, so its feed records releases without describing them
Element X Android
Element X Android ships roughly weekly, alternating real features with fix rounds
Wire
Calling is the one surface Wire's web client touches in every documented release.
Zoho Cliq
Zoho retells Cliq 7.0 as an AI story, and lets customers pick whose model tells it.
Rocket.Chat
Rocket.Chat finishes the 8.8 calling work while the licence wall for SSO gets a date.
See all grommunio alternatives → · See all Stalwart alternatives →
Recent activity from grommunio and Stalwart
Latest ship moves from both products, interleaved chronologically. ⚡ = editorial spark.
- 3d agoStalwartSCIM v2 provisioning lands in the Enterprise tier ⚡
- 9d agoStalwartMySQL key columns need a manual ALTER; Sieve gains spam-score vars
- 15d agoStalwartResource limits arrive for inbound reports and RocksDB caches
- 23d agoStalwartIMAP gains UIDONLY, UIDBATCHES and message-limit extensions
- 1mo agoStalwartJMAP delivery push arrives; strict relays stop rejecting calendar mail
- 1mo agoStalwartFix-only release: JMAP semantics and a credential escalation
- 2mo agogrommunioRelease Notes 2026.06.1
- 1y agogrommunioRelease Notes 2025.01.2
- 1y agogrommunioRelease Notes 2025.01.1
- 2y agogrommunioRelease Notes 2023.11.3
- 2y agogrommunioRelease Notes 2023.11.2
- 2y agogrommunioRelease Notes 2023.11.1
Frequently asked questions
What is the difference between grommunio and Stalwart?
They serve adjacent needs but don't currently overlap on shipped themes. Stalwart is currently shipping more aggressively (velocity 6.3 vs 0.0), 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 grommunio better than Stalwart?
Sparkpulse doesn't pick a winner — we score release velocity, not feature parity. Stalwart is currently shipping more aggressively (velocity 6.3 vs 0.0), 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 grommunio?
Top grommunio alternatives in Comms are ranked by recent ship velocity. Browse the "grommunio alternatives" section above for the current picks, or visit /alternatives/grommunio for the full list with editorial commentary on each.
What are the best alternatives to Stalwart?
Top Stalwart alternatives in Comms are ranked by recent ship velocity. Browse the "Stalwart alternatives" section above for the current picks, or visit /alternatives/stalwart for the full list with editorial commentary on each.