Signal Desktop
Signal Desktop's beta train is mostly fixes; call performance and notification controls are the only visible changes.
Comparison · Comms
Proton Bridge vs Stalwart
A side-by-side editorial comparison of Proton Bridge and Stalwart — release velocity, themes, recent moves, and the top alternatives to consider.
Proton Bridge vs Stalwart: at a glance
What is Proton Bridge?
Proton Bridge stays in maintenance mode: sync-state recovery, security patches, IMAP correctness.
Proton Bridge's releases in 2026 have been almost entirely maintenance: monthly vulnerability patches, Go toolchain bumps, IMAP RFC-compliance fixes, and now recovery from corrupted sync state files. User-facing additions are small (a close-window shortcut, CLI version display).
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.
Proton Bridge vs Stalwart: editorial side-by-side
Proton Bridge
5.0COMMS
Proton Bridge stays in maintenance mode: sync-state recovery, security patches, IMAP correctness.
◆ Current state
Proton Bridge's releases in 2026 have been almost entirely maintenance: monthly vulnerability patches, Go toolchain bumps, IMAP RFC-compliance fixes, and now recovery from corrupted sync state files. User-facing additions are small (a close-window shortcut, CLI version display).
◆ Where it's heading
The product is mature infrastructure focused on reliability rather than capability. The steady attention to sync robustness and error mapping suggests the team is working down support load, not building new surface.
◆ Prediction
Expect more point releases for security patches and sync fixes. The entries show no sign of a larger feature push.
Stalwart
6.3COMMS
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 Proton Bridge 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 Proton Bridge or Stalwart.
Salesmsg
Salesmsg turns NPS surveys into a recurring trigger for its automations.
Netcore Cloud
Netcore's feed stays on case studies, with one hint of a Zoho CRM sync.
Twilio
Twilio is rebuilding its media stack so AI runs server-side, not in a browser.
Element X Android
Element X Android is rebuilding its timeline renderer while filling feature gaps with legacy Element.
Zoho Cliq
Zoho Cliq is unbundling its licensing while spreading chat across every Zoho surface.
See all Proton Bridge alternatives → · See all Stalwart alternatives →
Recent activity from Proton Bridge and Stalwart
Latest ship moves from both products, interleaved chronologically. ⚡ = editorial spark.
- 4d agoProton Bridgev3.27.1: recover from corrupted sync state
- 24d agoProton Bridgev3.27.0: August security patches and IMAP fixes
- 27d agoStalwartv0.16.21
- 1mo agoStalwartv0.16.20 ⚡
- 1mo agoStalwartv0.16.19
- 1mo agoStalwartv0.16.18
- 1mo agoProton Bridgev3.26.0: July security patches and cleanup
- 1mo agoStalwartv0.16.17
- 2mo agoStalwartv0.16.16
- 4mo agoProton Bridgev3.25.0: clearer errors, legacy updater removed
- 5mo agoProton Bridgev3.24.2: new Go base image
- 5mo agoProton Bridgev3.24.1: restore old unlabel logic behind flag
Frequently asked questions
What is the difference between Proton Bridge and Stalwart?
They serve adjacent needs but don't currently overlap on shipped themes. Stalwart is currently shipping more aggressively (velocity 6.3 vs 5.0), 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 Proton Bridge 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 5.0), 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 Proton Bridge?
Top Proton Bridge alternatives in Comms are ranked by recent ship velocity. Browse the "Proton Bridge alternatives" section above for the current picks, or visit /alternatives/proton-bridge 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.