COMMS
Fonoster Cloud starts charging for calls as the project moves to fonoster.ai.
Alternatives · team communication tools
Stalwart alternatives
The best Stalwart alternatives in team communication tools, ranked by Sparkpulse's velocity_score.
Updated Nov 6, 2026
Looking for the best alternatives to Stalwart? Sparkpulse tracks and ranks 12 alternatives in team communication tools by shipping velocity — how frequently each ships meaningful updates, verified from official changelogs. For reference, Stalwart shipped 0 meaningful updates in the last 30 days and carries a velocity score of 5.0 out of 10 in 2026. The alternatives below are ranked the same way, so you're comparing real release momentum, not marketing claims.
About Stalwart
Stalwart's weekly releases have turned from new standards to correctness fixes.
Stalwart's releases since v0.16.20 are dominated by long Fixed lists across IMAP, JMAP, MTA, DMARC and iTIP. Additions have been small: a PowerDNS provider in 0.16.24, sd_notify and JMAP mailbox behavior in 0.16.26. The most consequential repair is a RocksDB bug in 0.16.26 that rewrote every stored blob on each compaction of the blobs column family, about once per 128MB of new mail.
Velocity 5.0 · Last update 4d ago
Top 12 alternatives to Stalwart
Ranked by recent ship velocity. Tap any card for the full editorial breakdown, or pivot to a head-to-head.
COMMS
Rocket.Chat patches 8.9 LTS with the load fixes from 9.0 while the candidate reaches rc.7.
SUPPORT
Twilio ships GA reconnect and mid-call config for Conversation Relay voice agents.
COMMS
Subsplash turns its Dashboard Home into one view across every church product
COMMS
mailcow's November release patches an admin RCE and reworks sync jobs.
COMMS
Netcore's blog keeps pitching search-plus-email on one data core, with no product release.
COMMS
Superhuman gives team admins a console and Enterprise a usage report that counts MCP.
COMMS
Slack's CLI now points coding agents to its MCP server and Skills plugin
COMMS
Synapse opens the 1.165 cycle on schedule after two 1.164 patches
COMMS
Stoat moves to release candidates and Gerrit, and gives server admins more control.
COMMS
Element 1.12.34 RC pops calls into picture-in-picture and lets modules shut off public rooms.
COMMS
Session survived its funding scare; now Pro is on hold and Protocol v2 is the bet.
Stalwart vs alternatives — shipping velocity at a glance
Velocity score (0–10) and meaningful releases shipped in the last 30 days, from official changelogs. Higher = shipping faster.
| Product | Velocity | Sparks · 30d | Focus areas | Latest release |
|---|---|---|---|---|
| Stalwart (baseline) | 5.0 | 0 | email-serverjmapinteroperability | — |
| Fonoster | 7.5 | 1 | programmable-voicesipbilling | Fonoster Cloud gets opt-in call billing |
| Rocket.Chat | 6.3 | 0 | team-chatlicensingself-hosted | — |
| Twilio | 6.3 | 0 | messagingvoice-aiaudience-segmentation | — |
| Subsplash | 5.0 | 0 | church-platformdashboardworkflow-automation | — |
| mailcow | 5.0 | 0 | mail-serverself-hostedsecurity-updates | — |
| Netcore Cloud | 5.0 | 0 | customer-engagementecommercemarketing-automation | — |
| Superhuman | 5.0 | 0 | emailteam adminenterprise | — |
| Slack | 5.0 | 0 | agentsmcpslackbot-skills | — |
| Synapse | 5.0 | 0 | matrix-protocolhomeserversecurity-patches | — |
| Stoat | 5.0 | 0 | chatself-hostedmoderation | — |
| Element | 5.0 | 0 | encryptionrecovery-keysmodule-api | — |
| Session | 5.0 | 0 | private messagingpost-quantumsession pro | — |
The 12 best Stalwart alternatives, in depth
1. Fonoster · velocity 7.5
Fonoster Cloud starts charging for calls as the project moves to fonoster.ai.
Over the last 30 days Fonoster shipped 1 meaningful update vs Stalwart's 0, most recently “Fonoster Cloud gets opt-in call billing”. Its velocity score of 7.5/10 blends that with longer-term release cadence.
Where Stalwart leans on email server, jmap and interoperability, Fonoster focuses on programmable voice, sip and billing.
Over the last 30 days Fonoster has been shipping faster than Stalwart — a point in its favour if release momentum matters to you.
2. Rocket.Chat · velocity 6.3
Rocket.Chat patches 8.9 LTS with the load fixes from 9.0 while the candidate reaches rc.7.
Its velocity score of 6.3/10 reflects longer-term release cadence.
Where Stalwart leans on email server, jmap and interoperability, Rocket.Chat focuses on team chat, licensing and self hosted.
Rocket.Chat and Stalwart have shipped at a similar pace over the last 30 days, so the decision comes down to fit and feature depth.
Full Rocket.Chat trajectory → · Compare Stalwart vs Rocket.Chat →
3. Twilio · velocity 6.3
Twilio ships GA reconnect and mid-call config for Conversation Relay voice agents.
Its velocity score of 6.3/10 reflects longer-term release cadence.
Where Stalwart leans on email server, jmap and interoperability, Twilio focuses on messaging, voice ai and audience segmentation.
Twilio and Stalwart have shipped at a similar pace over the last 30 days, so the decision comes down to fit and feature depth.
4. Subsplash · velocity 5.0
Subsplash turns its Dashboard Home into one view across every church product.
Its velocity score of 5.0/10 reflects longer-term release cadence.
Where Stalwart leans on email server, jmap and interoperability, Subsplash focuses on church platform, dashboard and workflow automation.
Subsplash and Stalwart have shipped at a similar pace over the last 30 days, so the decision comes down to fit and feature depth.
Full Subsplash trajectory → · Compare Stalwart vs Subsplash →
5. mailcow · velocity 5.0
Mailcow's November release patches an admin RCE and reworks sync jobs.
Its velocity score of 5.0/10 reflects longer-term release cadence.
Where Stalwart leans on email server, jmap and interoperability, mailcow focuses on mail server, self hosted and security updates.
mailcow and Stalwart have shipped at a similar pace over the last 30 days, so the decision comes down to fit and feature depth.
6. Netcore Cloud · velocity 5.0
Netcore's blog keeps pitching search-plus-email on one data core, with no product release.
Its velocity score of 5.0/10 reflects longer-term release cadence.
Where Stalwart leans on email server, jmap and interoperability, Netcore Cloud focuses on customer engagement, ecommerce and marketing automation.
Netcore Cloud and Stalwart have shipped at a similar pace over the last 30 days, so the decision comes down to fit and feature depth.
Full Netcore Cloud trajectory → · Compare Stalwart vs Netcore Cloud →
7. Superhuman · velocity 5.0
Superhuman gives team admins a console and Enterprise a usage report that counts MCP.
Its velocity score of 5.0/10 reflects longer-term release cadence.
Where Stalwart leans on email server, jmap and interoperability, Superhuman focuses on email, team admin and enterprise.
Superhuman and Stalwart have shipped at a similar pace over the last 30 days, so the decision comes down to fit and feature depth.
Full Superhuman trajectory → · Compare Stalwart vs Superhuman →
8. Slack · velocity 5.0
Slack's CLI now points coding agents to its MCP server and Skills plugin.
Its velocity score of 5.0/10 reflects longer-term release cadence.
Where Stalwart leans on email server, jmap and interoperability, Slack focuses on agents, mcp and slackbot skills.
Slack and Stalwart have shipped at a similar pace over the last 30 days, so the decision comes down to fit and feature depth.
9. Synapse · velocity 5.0
Synapse opens the 1.165 cycle on schedule after two 1.164 patches.
Its velocity score of 5.0/10 reflects longer-term release cadence.
Where Stalwart leans on email server, jmap and interoperability, Synapse focuses on matrix protocol, homeserver and security patches.
Synapse and Stalwart have shipped at a similar pace over the last 30 days, so the decision comes down to fit and feature depth.
10. Stoat · velocity 5.0
Stoat moves to release candidates and Gerrit, and gives server admins more control.
Its velocity score of 5.0/10 reflects longer-term release cadence.
Where Stalwart leans on email server, jmap and interoperability, Stoat focuses on chat, self hosted and moderation.
Stoat and Stalwart have shipped at a similar pace over the last 30 days, so the decision comes down to fit and feature depth.
11. Element · velocity 5.0
Element 1.12.34 RC pops calls into picture-in-picture and lets modules shut off public rooms.
Its velocity score of 5.0/10 reflects longer-term release cadence.
Where Stalwart leans on email server, jmap and interoperability, Element focuses on encryption, recovery keys and module api.
Element and Stalwart have shipped at a similar pace over the last 30 days, so the decision comes down to fit and feature depth.
12. Session · velocity 5.0
Session survived its funding scare; now Pro is on hold and Protocol v2 is the bet.
Its velocity score of 5.0/10 reflects longer-term release cadence.
Where Stalwart leans on email server, jmap and interoperability, Session focuses on private messaging, post quantum and session pro.
Session and Stalwart have shipped at a similar pace over the last 30 days, so the decision comes down to fit and feature depth.
Frequently asked questions
What are the best alternatives to Stalwart?
The top Stalwart alternatives we currently track in team communication tools are Fonoster, Rocket.Chat, Twilio, Subsplash, mailcow, ranked by recent ship velocity.
How is this list of Stalwart alternatives ranked?
Alternatives are ranked by Sparkpulse's velocity_score — release cadence + 30-day spark count + sector-relative ship rate.
Can I compare Stalwart directly with one of these alternatives?
Yes — every card has a "Compare with Stalwart" link to a side-by-side /compare page.