Misskey
Misskey offloads its embedded ML stack to external services and ships a critical security patch in consecutive major releases.
Comparison · Comms
Roundcube vs Superhuman
A side-by-side editorial comparison of Roundcube and Superhuman — release velocity, themes, recent moves, and the top alternatives to consider.
Roundcube vs Superhuman: at a glance
| Feature | Roundcube | Superhuman |
|---|---|---|
| Sector | Comms | Comms |
| Velocity score | 5.0 | 6.3 |
| Sparks · 30d | 0 | 1 |
| Top themes | security, xss, ssrf, email-security | email, ai-integration, mcp, mobile |
| Last editorial update | 5h ago | 5d ago |
| Website | Visit → | — |
What is Roundcube?
Roundcube patches 28+ vulnerabilities across two branches in a five-month hardening sprint
Roundcube has shipped six security releases across its main 1.7.x and LTS 1.6.x branches since June, patching a cumulative 28+ vulnerabilities including an RCE via the markasjunk plugin's cmd_learn driver, IMAP command injection through LITERAL+ byte-count desynchronization, multiple SSRF bypasses, cross-user contact group access, and zero-click stored XSS. The simultaneous dual-branch cadence shows active maintenance of both lines.
What is Superhuman?
Superhuman goes all-in on AI connectivity and mobile parity in one sprint.
Superhuman has moved well past its speed-focused roots. The complete iOS/Android redesign delivers a mobile experience on par with the desktop app, while the multi-account MCP connector makes Superhuman the only email client that exposes multiple inboxes simultaneously to Claude and ChatGPT. The themes refresh is cosmetic, but the AI integrations are structural. Auto Drafts 2.0 eliminates the blank-page problem on every reply.
Roundcube vs Superhuman: editorial side-by-side
Roundcube
5.0COMMS
Roundcube patches 28+ vulnerabilities across two branches in a five-month hardening sprint
◆ Current state
Roundcube has shipped six security releases across its main 1.7.x and LTS 1.6.x branches since June, patching a cumulative 28+ vulnerabilities including an RCE via the markasjunk plugin's cmd_learn driver, IMAP command injection through LITERAL+ byte-count desynchronization, multiple SSRF bypasses, cross-user contact group access, and zero-click stored XSS. The simultaneous dual-branch cadence shows active maintenance of both lines.
◆ Where it's heading
The volume and variety of external security reports — from Horizon3.ai, Samsung R&D, pwn.ai, and independent researchers — indicates Roundcube's attack surface is under sustained scrutiny. The 1.7.0 release in May introduced meaningful features (Markdown rendering, improved OAuth2/OIDC, mandatory public_html entry point), but the months since have been consumed by patching. Feature development on 1.7.x appears paused until the security debt settles.
◆ Prediction
Another paired security release across 1.7.x and 1.6.x is likely within 6-8 weeks given the cadence. The SSRF and CSS parsing issues have required multiple iterations to close fully, suggesting the hardening work isn't finished.
Superhuman
6.3COMMS
Superhuman goes all-in on AI connectivity and mobile parity in one sprint.
◆ Current state
Superhuman has moved well past its speed-focused roots. The complete iOS/Android redesign delivers a mobile experience on par with the desktop app, while the multi-account MCP connector makes Superhuman the only email client that exposes multiple inboxes simultaneously to Claude and ChatGPT. The themes refresh is cosmetic, but the AI integrations are structural. Auto Drafts 2.0 eliminates the blank-page problem on every reply.
◆ Where it's heading
Superhuman is positioning itself as the authoritative communications layer for AI agents — not just a fast email client. The MCP plugin and multi-account connectors are the rails; everything else (calendar on Android, mobile redesign, label sync) fills in the gaps needed to make that hub position credible. Expect each subsequent release to deepen AI orchestration over the inbox rather than adding standalone features.
◆ Prediction
AI-driven scheduling that bypasses manual share-availability flows is the next likely move — the calendar-on-Android feature and AI connectors are converging on a native booking experience that would let an AI agent schedule on a user's behalf without leaving Superhuman.
Alternatives to Roundcube 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 Roundcube or Superhuman.
Matrix
Matrix's changelog is a weekly community newsletter; no protocol or server releases visible in this window.
Subsplash
Subsplash's Workflows feature goes GA with email automation on every step, unifying church operations in one platform.
Stalwart
Stalwart adds full SCIM v2 provisioning and 24-language calendar support as its standards coverage extends further than most commercial mail servers.
Netcore Cloud
Netcore Cloud's available data is marketing blog content — no product feature signal this cycle.
Krisp
Krisp is building a full Call Center AI stack — voice translation, accent conversion, and supervisor analytics shipping weekly.
See all Roundcube alternatives → · See all Superhuman alternatives →
Recent activity from Roundcube and Superhuman
Latest ship moves from both products, interleaved chronologically. ⚡ = editorial spark.
- 2d agoRoundcubeRoundcube Webmail 1.7.4
- 2d agoRoundcubeRoundcube Webmail 1.6.19
- 7d agoSuperhumanSuperhuman Mail for iOS & Android 📱 ⚡
- 7d agoSuperhumanA fresh look for Superhuman Mail ✨
- 15d agoSuperhumanLabels on drafts sync with Gmail 🔄
- 1mo agoRoundcubeRoundcube Webmail 1.7.3
- 1mo agoRoundcubeRoundcube Webmail 1.6.18
- 1mo agoSuperhumanMultiple email accounts in Claude, ChatGPT, and MCP 🤖 ⚡
- 1mo agoSuperhumanAuto Drafts 2.0 ✨
- 2mo agoRoundcubeRoundcube Webmail 1.6.17
- 2mo agoRoundcubeRoundcube Webmail 1.7.2
- 2mo agoSuperhumanCalendar on Android 💚
Frequently asked questions
What is the difference between Roundcube and Superhuman?
They serve adjacent needs but don't currently overlap on shipped themes. Superhuman is currently shipping more aggressively (velocity 6.3 vs 5.0), with 1 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 Roundcube better than Superhuman?
Sparkpulse doesn't pick a winner — we score release velocity, not feature parity. Superhuman is currently shipping more aggressively (velocity 6.3 vs 5.0), with 1 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 Roundcube?
Top Roundcube alternatives in Comms are ranked by recent ship velocity. Browse the "Roundcube alternatives" section above for the current picks, or visit /alternatives/roundcube 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.