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Comparison · Comms
Stalwart vs Superhuman
A side-by-side editorial comparison of Stalwart and Superhuman — release velocity, themes, recent moves, and the top alternatives to consider.
Stalwart vs Superhuman: at a glance
| Feature | Stalwart | Superhuman |
|---|---|---|
| Sector | Comms | Comms |
| Velocity score | 6.3 | 5.0 |
| Sparks · 30d | 0 | 0 |
| Top themes | email-server, scim, jmap, enterprise-provisioning | email, calendar, mobile, ai-assistant |
| Last editorial update | 1mo ago | 13h ago |
| Website | Visit → | — |
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.
What is Superhuman?
Superhuman's mobile app catches up on density and gestures while AI reads attachments.
Superhuman Mail is an email and calendar client with AI drafting, search and an MCP server reserved for Business and Enterprise plans. The October 14 batch is mostly mobile ergonomics: Compact Mode, navigation that hides on scroll, and swipe to reply or forward. Ask AI, Write with AI and Write with Voice now handle attachments and images, and recurring meetings can be created in the calendar or through the MCP server.
Stalwart vs Superhuman: editorial side-by-side
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.
Superhuman
5.0COMMS
Superhuman's mobile app catches up on density and gestures while AI reads attachments.
◆ Current state
Superhuman Mail is an email and calendar client with AI drafting, search and an MCP server reserved for Business and Enterprise plans. The October 14 batch is mostly mobile ergonomics: Compact Mode, navigation that hides on scroll, and swipe to reply or forward. Ask AI, Write with AI and Write with Voice now handle attachments and images, and recurring meetings can be created in the calendar or through the MCP server.
◆ Where it's heading
The calendar keeps closing gaps with standalone calendar apps, and each new calendar action is exposed through the MCP server as well as the UI. Mobile is being tuned for heavy use after the redesign, and the AI features are widening what they can read rather than adding new surfaces.
◆ Prediction
Expect more calendar basics (week customization just shipped) and further MCP actions that mirror new UI features. The entries don't show when the announced voice mode or email engine rewrite will land.
Alternatives to Stalwart and Superhuman
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 Stalwart or Superhuman.
Salesmsg
Salesmsg lists its MCP server with Claude and ChatGPT, so texting runs from the assistant.
Twilio
Twilio Cohorts puts audience segmentation and bulk sends inside the messaging platform.
Signal Desktop
Signal Desktop's beta finally ships a visible feature: unread filters in folders and search.
Canary Mail
Canary Mail spends October on fixes after its AI translation push.
Netcore Cloud
Netcore launches Orbit for email delivery after a month of mostly marketing posts.
See all Stalwart alternatives → · See all Superhuman alternatives →
Recent activity from Stalwart and Superhuman
Latest ship moves from both products, interleaved chronologically. ⚡ = editorial spark.
- 1d agoSuperhumanSee more as you scroll 👀
- 1d agoSuperhumanRecurring meetings 📆
- 1d agoSuperhumanCustomize your week 📆
- 1d agoSuperhumanCompact Mode 🔍
- 1d agoSuperhumanEmoji reactions on comments 🙌
- 1d agoSuperhumanAttachments, images, and Superhuman AI 📎
- 1mo agoStalwartv0.16.21
- 1mo agoStalwartv0.16.20 ⚡
- 1mo agoStalwartv0.16.19
- 1mo agoStalwartv0.16.18
- 2mo agoStalwartv0.16.17
- 2mo agoStalwartv0.16.16
Frequently asked questions
What is the difference between Stalwart and Superhuman?
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 Stalwart better than Superhuman?
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 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.
What are the best alternatives to Superhuman?
Top Superhuman alternatives in Comms are ranked by recent ship velocity. Browse the "Superhuman alternatives" section above for the current picks, or visit /alternatives/superhuman for the full list with editorial commentary on each.