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Comparison · Mkt Auto
Sulu vs Customer.io
A side-by-side editorial comparison of Sulu and Customer.io — release velocity, themes, recent moves, and the top alternatives to consider.
Sulu vs Customer.io: at a glance
What is Sulu?
Sulu ships 2.6 and 3.0 in lockstep, and the 3.0 line still reads like a maintenance branch.
Sulu is a Symfony-based CMS for developer-built sites, and its release process is a synchronised pair: every 3.0.x patch ships within a minute of the matching 2.6.x patch, carrying largely the same pull requests. Six releases in five months — 3.0.8/2.6.25, 3.0.7/2.6.24, 3.0.6/2.6.23 — are almost entirely fixes, editor upgrades and framework compatibility work. A security advisory was patched across both branches in March.
What is Customer.io?
Customer.io's summer wave pushes messaging into location triggers and live device surfaces.
Customer.io shipped a dense summer release: geofence-based triggers, live notifications that render as iOS Live Activities and Android 16 Live Updates, an in-app notification inbox, and support for bringing your own SMS provider via Sinch, Infobip, or Vonage. Alongside the headline channels are workflow-level fixes that matter operationally — channel-based message frequency limits, date triggers on custom objects, and multiple mobile apps per workspace. LLM actions gained reusable knowledge sources so prompts can reference a file or Drive doc instead of repeating pasted text.
Sulu vs Customer.io: editorial side-by-side
Sulu
5.0MKT AUTO
Sulu ships 2.6 and 3.0 in lockstep, and the 3.0 line still reads like a maintenance branch.
◆ Current state
Sulu is a Symfony-based CMS for developer-built sites, and its release process is a synchronised pair: every 3.0.x patch ships within a minute of the matching 2.6.x patch, carrying largely the same pull requests. Six releases in five months — 3.0.8/2.6.25, 3.0.7/2.6.24, 3.0.6/2.6.23 — are almost entirely fixes, editor upgrades and framework compatibility work. A security advisory was patched across both branches in March.
◆ Where it's heading
Three threads run through the pairs. Editor upkeep is constant, with CKEditor moving to 47 LTS and then 48 and the fallout — table widgets, webpack font builds — fixed release by release. Framework compatibility is the second: Request->get calls replaced for Symfony 8, PHPUnit 13 and PHPStan kept green on lowest dependencies. The third and most interesting is data-model cleanup on the 3.0 side, where tags migrated from names to IDs behind a newly added DoctrineMigrationsBundle, with smart-content filters reworked to match. What is not visible is any capability that exists on 3.0 and not on 2.6 — a major version that is not yet behaving like one.
◆ Prediction
Expect the paired-release rhythm to continue with more Symfony 8 preparation and CKEditor 48 fallout. The open question is when 3.0 starts receiving work that is not upmerged from 2.6; until then the major version number is not buying users anything.
Customer.io
7.5MKT AUTO
Customer.io's summer wave pushes messaging into location triggers and live device surfaces.
◆ Current state
Customer.io shipped a dense summer release: geofence-based triggers, live notifications that render as iOS Live Activities and Android 16 Live Updates, an in-app notification inbox, and support for bringing your own SMS provider via Sinch, Infobip, or Vonage. Alongside the headline channels are workflow-level fixes that matter operationally — channel-based message frequency limits, date triggers on custom objects, and multiple mobile apps per workspace. LLM actions gained reusable knowledge sources so prompts can reference a file or Drive doc instead of repeating pasted text.
◆ Where it's heading
The direction is toward owning more of the device surface rather than more of the inbox. Live Activities, the notification inbox, and geofences all move triggering and rendering closer to where the customer physically is, which is a different competitive axis than email deliverability. At the same time, BYO SMS providers and channel-level frequency caps loosen delivery lock-in and hand rate control to the operator — a platform posture, not a messaging-tool one.
◆ Prediction
Expect the remaining device-native surfaces to fill in — richer inbox and Live Activity templating — and expect LLM actions to keep absorbing workflow context now that knowledge sources are reusable.
Alternatives to Sulu and Customer.io
Other Mkt Auto 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 Sulu or Customer.io.
Eleventy
The v4 canary line is being renamed Build Awesome while 3.x is kept on pure maintenance.
Hugo
Steady feature-then-patch cadence, with security reports rising because AI tools are finding them
ClickFunnels
Measurement gets granular while the API quietly opens ClickFunnels up to outside agents
n8n
n8n's daily patch train hides the real work: hardening its MCP server into a proper auth resource.
OneSignal
OneSignal is arguing a new category into existence before showing the product behind it.
See all Sulu alternatives → · See all Customer.io alternatives →
Recent activity from Sulu and Customer.io
Latest ship moves from both products, interleaved chronologically. ⚡ = editorial spark.
- 2d agoCustomer.ioAdd reusable knowledge sources to LLM actions
- 2d agoCustomer.ioSummer release: geofences, live notifications, more SMS providers
- 2d agoCustomer.ioGeofences: message people when they enter or exit a location ⚡
- 2d agoCustomer.ioSet up SMS with Sinch, Infobip, or Vonage
- 3d agoCustomer.ioSend push notifications to multiple mobile apps in one workspace
- 8d agoCustomer.ioLive notifications: real-time updates without opening your app ⚡
- 15d agoSuluSulu 3.0.8 validates selection filter params at build time
- 15d agoSuluSulu 2.6.25 adds a redirect after SSO login
- 2mo agoSuluSulu 3.0.7 fixes smart-content filtering and speeds up indexing
- 2mo agoSuluSulu 2.6.24 upgrades CKEditor to version 48
- 2mo agoSuluSulu 3.0.6 migrates tag names to IDs with Doctrine migrations
- 2mo agoSuluSulu 2.6.23 moves to CKEditor 47 LTS and preps Symfony 8
Frequently asked questions
What is the difference between Sulu and Customer.io?
They serve adjacent needs but don't currently overlap on shipped themes. Customer.io is currently shipping more aggressively (velocity 7.5 vs 5.0), with 2 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 Sulu better than Customer.io?
Sparkpulse doesn't pick a winner — we score release velocity, not feature parity. Customer.io is currently shipping more aggressively (velocity 7.5 vs 5.0), with 2 editorial sparks in the last 30 days against 0. For your specific use case, the alternatives sections above list other Mkt Auto products to evaluate alongside.
What are the best alternatives to Sulu?
Top Sulu alternatives in Mkt Auto are ranked by recent ship velocity. Browse the "Sulu alternatives" section above for the current picks, or visit /alternatives/sulu for the full list with editorial commentary on each.
What are the best alternatives to Customer.io?
Top Customer.io alternatives in Mkt Auto are ranked by recent ship velocity. Browse the "Customer.io alternatives" section above for the current picks, or visit /alternatives/customerio for the full list with editorial commentary on each.