Chatwoot
Chatwoot adds WhatsApp BSUID support ahead of Meta's phone number privacy rollout
Comparison · Comms
Fellow vs Stalwart
A side-by-side editorial comparison of Fellow and Stalwart — release velocity, themes, recent moves, and the top alternatives to consider.
Fellow vs Stalwart: at a glance
What is Fellow?
Fellow's public changelog has been silent since 2021 — no recent direction is observable here.
The visible signal stops in spring 2021. The last few releases were calendar-extension touch-ups: action items appearing directly in the Google Calendar extension, public view-only meeting links for external attendees, and multi-calendar sync within a single Google or Office account. Nothing in this dataset reflects the past several years of Fellow's actual work.
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.
Fellow vs Stalwart: editorial side-by-side
Fellow
0.0COMMS
Fellow's public changelog has been silent since 2021 — no recent direction is observable here.
◆ Current state
The visible signal stops in spring 2021. The last few releases were calendar-extension touch-ups: action items appearing directly in the Google Calendar extension, public view-only meeting links for external attendees, and multi-calendar sync within a single Google or Office account. Nothing in this dataset reflects the past several years of Fellow's actual work.
◆ Where it's heading
From the entries alone, no current trajectory can be inferred — the data is years stale. Whether Fellow has shifted to AI-meeting-notes or remained focused on the original meeting-management surface is not visible here and would be guesswork to assert.
◆ Prediction
Predictions can't be grounded in this data. The most useful next step is to refresh Fellow's changelog source so that present-day moves are captured.
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 Fellow 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 Fellow or Stalwart.
Krisp
Krisp goes free-to-try on Call Center AI while deepfake detection lands in live calls
Element X Android
Element X Android is rebuilding its timeline renderer while adding search, status, and richer polls.
Twilio
Twilio embeds full omnichannel routing into Salesforce, moving beyond raw API consumers.
Netcore Cloud
Netcore launches Cori, an AI marketing agent that monitors channels and finds revenue gaps automatically.
Tawk.to
tawk.to ships a programmable widget API and AI assistant improvements while maintaining its free-forever positioning.
See all Fellow alternatives → · See all Stalwart alternatives →
Recent activity from Fellow and Stalwart
Latest ship moves from both products, interleaved chronologically. ⚡ = editorial spark.
- 20d agoStalwartv0.16.21
- 27d agoStalwartv0.16.20 ⚡
- 1mo agoStalwartv0.16.19
- 1mo agoStalwartv0.16.18
- 1mo agoStalwartv0.16.17
- 1mo agoStalwartv0.16.16
- 5y agoFellowAction items in Google Calendar extension 📆
- 5y agoFellowPublic links 🔗
- 5y agoFellowSync multiple calendars 📅
Frequently asked questions
What is the difference between Fellow and Stalwart?
They serve adjacent needs but don't currently overlap on shipped themes. Stalwart is currently shipping more aggressively (velocity 6.3 vs 0.0), 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 Fellow 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 0.0), 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 Fellow?
Top Fellow alternatives in Comms are ranked by recent ship velocity. Browse the "Fellow alternatives" section above for the current picks, or visit /alternatives/fellow 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.