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SimpleX Chat vs Stalwart

A side-by-side editorial comparison of SimpleX Chat and Stalwart — release velocity, themes, recent moves, and the top alternatives to consider.

SimpleX Chat vs Stalwart: at a glance

FeatureSimpleX ChatStalwart
SectorCommsComms
Velocity score6.36.3
Sparks · 30d01
Top themesprivacy, channels, decentralization, message-signingemail-server, scim, jmap, enterprise-provisioning
Last editorial update1mo ago8d ago
WebsiteVisit →Visit →

What is SimpleX Chat?

The no-identifier messenger is building public channels — and has to invent trust from scratch

SimpleX Chat is deep in a v7.0 beta cycle, six betas in, with the stable armv7a tag now cut. The release is dominated by channels: broadcast surfaces with subscribers, contributor and moderator roles, searchable subscriber lists, and CLI access. Alongside them sits SimpleX names — registerable, resolvable names for channels and businesses — and per-server role controls that let self-hosters run a relay that handles only message reception, private routing, or name resolution.

Read the full SimpleX Chat trajectory →

What is Stalwart?

Stalwart adds full SCIM v2 provisioning and 24-language calendar support as its standards coverage extends further than most commercial mail servers.

Stalwart is maintaining a weekly-or-faster release cadence, with alternating feature releases and dense bug-fix releases. The v0.16.20 release landed full SCIM v2 (Enterprise) including cursor-based pagination and the IPSIE lifecycle profile, conference links in calendar invites, and 24 new calendar interface translations. Below the feature line, the project is steadily closing correctness gaps across JMAP, CalDAV, IMAP, and MTA — many of them edge-case RFC compliance issues.

Read the full Stalwart trajectory →

SimpleX Chat vs Stalwart: editorial side-by-side

S6.3

The no-identifier messenger is building public channels — and has to invent trust from scratch

◆ Current state

SimpleX Chat is deep in a v7.0 beta cycle, six betas in, with the stable armv7a tag now cut. The release is dominated by channels: broadcast surfaces with subscribers, contributor and moderator roles, searchable subscriber lists, and CLI access. Alongside them sits SimpleX names — registerable, resolvable names for channels and businesses — and per-server role controls that let self-hosters run a relay that handles only message reception, private routing, or name resolution.

◆ Where it's heading

This is the hardest problem the project has taken on. SimpleX's premise is that users have no identifiers at all, and public channels need exactly the opposite: a stable name people can find and an author they can verify. The answer taking shape is cryptographic rather than account-based — message signing, member security-code verification, and name resolution run as an opt-in server function. The betas since then have shifted from adding channel features to hardening the role model, rejecting forwards from unexpected admins and locking relay-role assignment.

◆ Prediction

A 7.0 stable release looks imminent given the non-beta tag, with message signing held back for 7.1 as the notes state. Expect the next cycle to turn signing on and continue tightening who can act as a relay or admin inside a channel.

S6.3

Stalwart adds full SCIM v2 provisioning and 24-language calendar support as its standards coverage extends further than most commercial mail servers.

◆ Current state

Stalwart is maintaining a weekly-or-faster release cadence, with alternating feature releases and dense bug-fix releases. The v0.16.20 release landed full SCIM v2 (Enterprise) including cursor-based pagination and the IPSIE lifecycle profile, conference links in calendar invites, and 24 new calendar interface translations. Below the feature line, the project is steadily closing correctness gaps across JMAP, CalDAV, IMAP, and MTA — many of them edge-case RFC compliance issues.

◆ Where it's heading

Stalwart is building toward parity with commercial enterprise mail servers on identity federation and provisioning (SCIM v2, VAPID for web push, DMARCbis/DKIM2 already landed). The pace of RFC implementation is unusually aggressive for an open-source project; the combination of JMAP, CalDAV, IMAP UIDONLY/UIDBATCHES, and SCIM v2 positions it as a viable self-hosted alternative for organizations that need standards compliance without vendor lock-in.

◆ Prediction

WebAuthn/passkey-based authentication and improved multi-tenant administration tooling are the most likely next capability additions, given the current trajectory toward enterprise identity management.

Alternatives to SimpleX Chat 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 SimpleX Chat or Stalwart.

See all SimpleX Chat alternatives → · See all Stalwart alternatives →

Recent activity from SimpleX Chat and Stalwart

Latest ship moves from both products, interleaved chronologically. ⚡ = editorial spark.

  1. 10d agoStalwartv0.16.21
  2. 17d agoStalwartv0.16.20
  3. 22d agoStalwartv0.16.19
  4. 29d agoStalwartv0.16.18
  5. 1mo agoStalwartv0.16.17
  6. 1mo agoStalwartv0.16.16
  7. 1mo agoSimpleX Chatv7.0.0-beta.6
  8. 1mo agoSimpleX Chatv7.0.0-beta.5
  9. 1mo agoSimpleX Chatv7.0.0-beta.4
  10. 2mo agoSimpleX Chatv7.0 beta 3: registrable SimpleX names for channels
  11. 2mo agoSimpleX ChatSimpleX 7.0-beta.2: subscriber roles and CLI channel connect
  12. 2mo agoSimpleX ChatPromote channel subscribers to contributors (v7.0 beta.1)

Frequently asked questions

What is the difference between SimpleX Chat and Stalwart?

They serve adjacent needs but don't currently overlap on shipped themes. SimpleX Chat and Stalwart are shipping at a similar cadence (velocity 6.3 vs 6.3, 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 SimpleX Chat better than Stalwart?

Sparkpulse doesn't pick a winner — we score release velocity, not feature parity. SimpleX Chat and Stalwart are shipping at a similar cadence (velocity 6.3 vs 6.3, 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 SimpleX Chat?

Top SimpleX Chat alternatives in Comms are ranked by recent ship velocity. Browse the "SimpleX Chat alternatives" section above for the current picks, or visit /alternatives/simplex-chat 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.