MailBeez
MailBeez V5 arrives with a redesigned workspace, dark mode and V5-ready modules.
Comparison · Mkt Auto
Customer.io vs Sulu
A side-by-side editorial comparison of Customer.io and Sulu — release velocity, themes, recent moves, and the top alternatives to consider.
Customer.io vs Sulu: at a glance
| Feature | Customer.io | Sulu |
|---|---|---|
| Sector | Mkt Auto | Mkt Auto |
| Velocity score | 5.0 | 5.0 |
| Sparks · 30d | 0 | 0 |
| Top themes | experiments, design-studio, sms, email-analytics | cms, symfony, two-factor auth, lockstep releases |
| Last editorial update | 4d ago | 11d ago |
| Website | — | Visit → |
What is Customer.io?
Customer.io puts experiments inside automations and makes Design Studio the default editor.
Customer.io is consolidating messaging work into its own canvas. On November 9 Design Studio became the default email editor, covering SMS, WhatsApp and inbox messages too, and Experiments arrived for testing whole multi-step paths inside an automation. The week before brought dynamic SMS senders by country, click heatmaps and per-language rules for auto-translate, after sign-up forms, the Object trigger and new API keys.
What is Sulu?
Sulu opens its 3.1 line while 3.0 and 2.6 keep shipping in lockstep.
Sulu is a Symfony-based CMS released as matched 3.0.x and 2.6.x patches. The October 1 pair added a request log admin view and a guided forced two-factor setup, and the October 29 pair let editors copy content to several locales at once. The same day, 3.1.0-alpha1 opened the next line with route field actions, a media download button and product-family attributes.
Customer.io vs Sulu: editorial side-by-side
Customer.io
5.0MKT AUTO
Customer.io puts experiments inside automations and makes Design Studio the default editor.
◆ Current state
Customer.io is consolidating messaging work into its own canvas. On November 9 Design Studio became the default email editor, covering SMS, WhatsApp and inbox messages too, and Experiments arrived for testing whole multi-step paths inside an automation. The week before brought dynamic SMS senders by country, click heatmaps and per-language rules for auto-translate, after sign-up forms, the Object trigger and new API keys.
◆ Where it's heading
Releases are moving testing, translation and content creation into the places teams already build journeys, so fewer steps need an outside tool. Daily-cadence shipping across messaging, data and AI translation suggests a broad push rather than one flagship bet.
◆ Prediction
Expect Design Studio to add the channels it says are coming and Experiments to gain reporting or winner automation inside the workflow view.
Sulu
5.0MKT AUTO
Sulu opens its 3.1 line while 3.0 and 2.6 keep shipping in lockstep.
◆ Current state
Sulu is a Symfony-based CMS released as matched 3.0.x and 2.6.x patches. The October 1 pair added a request log admin view and a guided forced two-factor setup, and the October 29 pair let editors copy content to several locales at once. The same day, 3.1.0-alpha1 opened the next line with route field actions, a media download button and product-family attributes.
◆ Where it's heading
Sulu is starting a feature line while keeping two maintenance lines in sync, with security and admin hardening flowing into both. Product attributes in 3.1 point toward commerce-adjacent content modelling.
◆ Prediction
Further 3.1 alphas and betas are likely before year end, with 3.0 and 2.6 patches continuing in pairs.
Alternatives to Customer.io and Sulu
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 Customer.io or Sulu.
Postiz
Postiz encrypts channel tokens and lets agents send connect links for new channels.
n8n
n8n fixes executions being redacted when they used global credentials, on three lines.
Gumloop
Gumloop 13.6 gives admins one set of rules for every tool an agent touches.
AcyMailing
AcyMailing 11.1.2 closes holes that let strangers read or unsubscribe any subscriber.
Buttondown
Buttondown lets writers reorder editor blocks without a mouse.
See all Customer.io alternatives → · See all Sulu alternatives →
Recent activity from Customer.io and Sulu
Latest ship moves from both products, interleaved chronologically. ⚡ = editorial spark.
- 4d agoCustomer.ioQuiet hours hold SMS until recipients' local sending hours
- 5d agoCustomer.ioDesign Studio is now the default email editor
- 5d agoCustomer.ioRun experiments in your automations
- 8d agoCustomer.ioNew click heatmaps show how people engage with your emails
- 8d agoCustomer.ioDynamic senders: automatically use the right SMS sender
- 9d agoCustomer.ioSet language rules for auto-translated messages
- 15d agoSuluSulu 3.1.0-alpha1 opens the next line with product attributes
- 15d agoSuluSulu 3.0.11: copy content to several locales, route fixes
- 15d agoSuluSulu 2.6.28: PHP 8.6 CI and small fixes
- 1mo agoSuluSulu 3.0.10 adds request log view and guided 2FA setup
- 1mo agoSuluSulu 2.6.27 mirrors 3.0.10 fixes and 2FA guidance
- 2mo agoSuluMedia gains AI disclosure and origin fields; TOTP 2FA lands
Frequently asked questions
What is the difference between Customer.io and Sulu?
They serve adjacent needs but don't currently overlap on shipped themes. Customer.io and Sulu are shipping at a similar cadence (velocity 5.0 vs 5.0, both within Sparkpulse's "active" band). See the at-a-glance table above for a side-by-side breakdown of velocity, recent sparks, and editorial themes.
Is Customer.io better than Sulu?
Sparkpulse doesn't pick a winner — we score release velocity, not feature parity. Customer.io and Sulu are shipping at a similar cadence (velocity 5.0 vs 5.0, both within Sparkpulse's "active" band). For your specific use case, the alternatives sections above list other Mkt Auto products to evaluate alongside.
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/customer-io for the full list with editorial commentary on each.
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.