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Comparison · Comms
Heymarket vs Stalwart
A side-by-side editorial comparison of Heymarket and Stalwart — release velocity, themes, recent moves, and the top alternatives to consider.
Heymarket vs Stalwart: at a glance
What is Heymarket?
Real features ship between the SEO posts: tags, webhooks, escalations, and now RCS via Twilio.
Heymarket's feed is a marketing blog with product announcements mixed in at roughly one post in three. The genuine releases in this window are Escalations, which pushes an unanswered conversation to a named person, and enablement for RCS campaigns through Twilio. The rest — a conversational-AI definition, a healthcare AI buying guide, email-writing advice — is search content with no product change behind it.
What is Stalwart?
Stalwart is shipping email's next-generation auth stack while the specs are still in draft.
Stalwart is an all-in-one mail and collaboration server — SMTP, IMAP, JMAP, CalDAV, CardDAV and WebDAV in one binary — releasing every one to two weeks on the 0.16.x line. The last two months read as a standards campaign: DKIM2 and the full DMARCbis set in 0.16.12, VAPID push in 0.16.14, FreeBSD support in 0.16.13, and a run of IMAP extensions (UIDONLY, UIDBATCHES, MESSAGELIMIT/SAVELIMIT) in 0.16.17. Between the additions, most of each release is JMAP conformance repair driven by the jmap-test-suite.
Heymarket vs Stalwart: editorial side-by-side
Heymarket
2.5COMMS
Real features ship between the SEO posts: tags, webhooks, escalations, and now RCS via Twilio.
◆ Current state
Heymarket's feed is a marketing blog with product announcements mixed in at roughly one post in three. The genuine releases in this window are Escalations, which pushes an unanswered conversation to a named person, and enablement for RCS campaigns through Twilio. The rest — a conversational-AI definition, a healthcare AI buying guide, email-writing advice — is search content with no product change behind it.
◆ Where it's heading
The product work visible here is all about absorbing volume: tags to structure conversations, inbound webhooks to pull in the rest of the stack, escalations to catch what nobody answered, and AI agents the team says it trained against its own inbox first. Heymarket is building the operations layer around business messaging rather than extending the messaging surface itself. Channel breadth is arriving through partners, with RCS riding Twilio rather than native carrier work.
◆ Prediction
The next release is most likely another triage or routing control, since escalations and conversation tags both point that way. Entry bodies in this feed are truncated excerpts, so how far the AI agent work has actually gone is not visible here.
Stalwart
5.0COMMS
Stalwart is shipping email's next-generation auth stack while the specs are still in draft.
◆ Current state
Stalwart is an all-in-one mail and collaboration server — SMTP, IMAP, JMAP, CalDAV, CardDAV and WebDAV in one binary — releasing every one to two weeks on the 0.16.x line. The last two months read as a standards campaign: DKIM2 and the full DMARCbis set in 0.16.12, VAPID push in 0.16.14, FreeBSD support in 0.16.13, and a run of IMAP extensions (UIDONLY, UIDBATCHES, MESSAGELIMIT/SAVELIMIT) in 0.16.17. Between the additions, most of each release is JMAP conformance repair driven by the jmap-test-suite.
◆ Where it's heading
The project is building toward being the reference implementation of the modern mail stack — JMAP first, with the classic protocols held at parity rather than left behind. The fix lists have shifted in character over these eight releases: less "feature does not work", more "spec detail is wrong", which is what a codebase looks like as it converges on conformance. Security and multi-tenancy fixes keep appearing alongside the protocol work, indicating real deployments are exercising the newer subsystems.
◆ Prediction
The next releases most likely track revisions to the drafts already implemented — DKIM2, JMAP push and the calendar drafts are all still moving — rather than adding another protocol surface. Expect continued JMAP conformance fixes until the test suite stops producing them.
Alternatives to Heymarket 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 Heymarket or Stalwart.
Respond.io
respond.io is monetizing AI usage directly while putting an assistant that builds agents in every workspace.
VerneMQ
VerneMQ's 2.2.0 collects a year of cluster and connection fixes into one release.
Roundcube
Roundcube is shipping matched security pairs across 1.7 and 1.6 LTS, roughly monthly.
Gromox
Gromox is filling in Exchange Web Services fast enough to matter for non-Outlook clients.
NanoMQ
An edge MQTT broker hardening for vehicles — and dropping the old embedded arches to do it.
See all Heymarket alternatives → · See all Stalwart alternatives →
Recent activity from Heymarket and Stalwart
Latest ship moves from both products, interleaved chronologically. ⚡ = editorial spark.
- 13h agoStalwartIMAP gains UIDONLY, UIDBATCHES and message-limit extensions
- 3d agoHeymarketWhat is conversational AI for business? Definition and how it works
- 8d agoStalwartJMAP delivery push arrives; strict relays stop rejecting calendar mail
- 15d agoStalwartFix-only release: JMAP semantics and a credential escalation
- 21d agoStalwartVAPID lands for JMAP Web Push
- 29d agoStalwartFreeBSD support, plus OAuth scopes for IMAP, SMTP and Sieve
- 1mo agoStalwartDKIM2 and the full DMARCbis suite ship in one release ⚡
- 1mo agoHeymarketCreate high-impact RCS marketing campaigns in Heymarket using Twilio
- 2mo agoHeymarketHow to choose an AI solution for healthcare operations
- 2mo agoHeymarketHow to polish your emails (and why it’s worth the extra minute or two)
- 2mo agoHeymarketTraining our AI agents: Why we became our own first customers
- 2mo agoHeymarketIntroducing Escalations: Alerting the right person at the right moment
Frequently asked questions
What is the difference between Heymarket and Stalwart?
They serve adjacent needs but don't currently overlap on shipped themes. Stalwart is currently shipping more aggressively (velocity 5.0 vs 2.5), 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 Heymarket better than Stalwart?
Sparkpulse doesn't pick a winner — we score release velocity, not feature parity. Stalwart is currently shipping more aggressively (velocity 5.0 vs 2.5), 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 Heymarket?
Top Heymarket alternatives in Comms are ranked by recent ship velocity. Browse the "Heymarket alternatives" section above for the current picks, or visit /alternatives/heymarket 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.