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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?
Heymarket's feed has gone all-in on SEO explainers, with product news nowhere in the recent window.
The last several weeks are definitional content: what conversational AI is, RCS versus SMS, what a shared inbox does. The most recent real product post in view is Escalations, and before that an RCS campaign walkthrough built on Twilio. Business messaging, a shared team inbox, and AI agents remain the three pillars the content keeps circling.
What is Stalwart?
Stalwart is chasing mail RFCs and its own storage layer at the same time
Stalwart ships roughly weekly, and the releases divide cleanly between standards implementation and correctness work. v0.16.18 turns toward resource control — bounds on decompressed inbound DMARC and TLS report size, a cap on RocksDB block-cache memory, column families tuned per access pattern, and a queue scheduler that stops rescanning from the earliest pending event. The preceding releases added IMAP UIDONLY, UIDBATCHES and MESSAGELIMIT, plus JMAP email push and VAPID.
Heymarket vs Stalwart: editorial side-by-side
Heymarket
5.0COMMS
Heymarket's feed has gone all-in on SEO explainers, with product news nowhere in the recent window.
◆ Current state
The last several weeks are definitional content: what conversational AI is, RCS versus SMS, what a shared inbox does. The most recent real product post in view is Escalations, and before that an RCS campaign walkthrough built on Twilio. Business messaging, a shared team inbox, and AI agents remain the three pillars the content keeps circling.
◆ Where it's heading
The publishing mix has shifted away from release notes toward top-of-funnel search content, which makes the feed a poor proxy for shipping velocity. What product signal exists points at AI agents handling routine customer messaging and RCS as the richer channel Heymarket is betting on over plain SMS.
◆ Prediction
The repeated RCS and conversational-AI framing suggests the next real release lands in one of those two areas, but the current entries do not support a more specific call.
Stalwart
5.0COMMS
Stalwart is chasing mail RFCs and its own storage layer at the same time
◆ Current state
Stalwart ships roughly weekly, and the releases divide cleanly between standards implementation and correctness work. v0.16.18 turns toward resource control — bounds on decompressed inbound DMARC and TLS report size, a cap on RocksDB block-cache memory, column families tuned per access pattern, and a queue scheduler that stops rescanning from the earliest pending event. The preceding releases added IMAP UIDONLY, UIDBATCHES and MESSAGELIMIT, plus JMAP email push and VAPID.
◆ Where it's heading
Two threads run through every release. One is RFC coverage across IMAP, JMAP, CalDAV and WebDAV, implemented close to the specification including drafts. The other is a long tail of protocol-conformance fixes, many of them cases where JMAP and IMAP disagreed about the same state. The newest release adds a third: memory and scheduling limits, which is what a server codebase starts doing when deployments get large enough for defaults to hurt.
◆ Prediction
Expect continued RFC additions across the JMAP and IMAP surfaces, with more of the storage-tuning work that v0.16.18 started as RocksDB deployments scale.
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.
Proton Bridge
Proton Bridge spends its first release in ten weeks on crashes, memory bounds and dead code
Mux
Every manual control Mux ships now arrives with a Robots workflow that does it for you
Netcore Cloud
Netcore's feed remains a demand-generation channel; ten entries, zero product releases.
mailcow
mailcow's release notes are almost entirely upstream security currency.
Openfire
Openfire keeps its XMPP server current without changing what it is.
See all Heymarket alternatives → · See all Stalwart alternatives →
Recent activity from Heymarket and Stalwart
Latest ship moves from both products, interleaved chronologically. ⚡ = editorial spark.
- 1d agoStalwartResource limits arrive for inbound reports and RocksDB caches
- 7d agoHeymarketConversational AI for customer service: How it works, benefits & use cases
- 7d agoHeymarketWhat is RCS vs. SMS messaging for business?
- 7d agoHeymarketShared inbox: What is a shared mailbox for teams?
- 8d agoStalwartIMAP gains UIDONLY, UIDBATCHES and message-limit extensions
- 11d agoHeymarketWhat is conversational AI for business? Definition and how it works
- 16d agoStalwartJMAP delivery push arrives; strict relays stop rejecting calendar mail
- 23d agoStalwartFix-only release: JMAP semantics and a credential escalation
- 29d agoStalwartVAPID lands for JMAP Web Push
- 1mo agoStalwartFreeBSD support, plus OAuth scopes for IMAP, SMTP and Sieve
- 1mo agoHeymarketCreate high-impact RCS marketing campaigns in Heymarket using Twilio
- 2mo agoHeymarketHow to choose an AI solution for healthcare operations
Frequently asked questions
What is the difference between Heymarket and Stalwart?
They serve adjacent needs but don't currently overlap on shipped themes. Heymarket and Stalwart 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 Heymarket better than Stalwart?
Sparkpulse doesn't pick a winner — we score release velocity, not feature parity. Heymarket and Stalwart 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 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.