Sulu
Sulu ships 2.6 and 3.0 in lockstep, and the 3.0 line still reads like a maintenance branch.
Comparison · Mkt Auto
Eleventy vs Customer.io
A side-by-side editorial comparison of Eleventy and Customer.io — release velocity, themes, recent moves, and the top alternatives to consider.
Eleventy vs Customer.io: at a glance
| Feature | Eleventy | Customer.io |
|---|---|---|
| Sector | Mkt Auto | Mkt Auto |
| Velocity score | 5.0 | 7.5 |
| Sparks · 30d | 0 | 2 |
| Top themes | static-site-generator, rebrand, breaking-changes, async-templates | geofencing, llm knowledge, byo sms, live notifications |
| Last editorial update | 2h ago | 1d ago |
| Website | Visit → | — |
What is Eleventy?
The v4 canary line is being renamed Build Awesome while 3.x is kept on pure maintenance.
Two lines run in parallel. The 3.x branch gets dependency-only releases — 3.1.5 and 3.1.6 explicitly ship no core code changes, after 3.1.3 and 3.1.4 failed to publish and were left as immutable dead tags. The v4 alpha train, meanwhile, is where the work is: Node minimum raised to 22.15, page.inputPathDir and page.dir removed, batched incremental builds added, and a large refactor of the Nunjucks fork onto a fully-async prerelease. The releases themselves now carry the Build Awesome name and offer an @awesome.me/buildawesome install alongside @11ty/eleventy@canary.
What is Customer.io?
Location becomes a trigger, Twilio stops being the only SMS path, and the LLM layer gets a memory
The summer window widens both ends of the automation graph. On the input side, geofences turn physical entry and exit into workflow triggers and date triggers now read attributes off custom objects; on the output side, SMS opens to Sinch, Infobip, and Vonage instead of Twilio alone, and live notifications add a persistent, continuously updating message format on iOS and Android. The LLM side gains a workspace-scoped Knowledge Library that both LLM actions and the Agent can read, replacing per-prompt copy-paste. Channel-based message limits and unsubscribe-preserving profile merges tighten the send-side guardrails underneath all of it.
Eleventy vs Customer.io: editorial side-by-side
Eleventy
5.0MKT AUTO
The v4 canary line is being renamed Build Awesome while 3.x is kept on pure maintenance.
◆ Current state
Two lines run in parallel. The 3.x branch gets dependency-only releases — 3.1.5 and 3.1.6 explicitly ship no core code changes, after 3.1.3 and 3.1.4 failed to publish and were left as immutable dead tags. The v4 alpha train, meanwhile, is where the work is: Node minimum raised to 22.15, page.inputPathDir and page.dir removed, batched incremental builds added, and a large refactor of the Nunjucks fork onto a fully-async prerelease. The releases themselves now carry the Build Awesome name and offer an @awesome.me/buildawesome install alongside @11ty/eleventy@canary.
◆ Where it's heading
v4 is accumulating breaking changes faster than it is stabilizing — three of the entries in this window announce removals or minimum-version bumps, and alpha.10 exists only to hotfix a regression alpha.9 introduced. The Nunjucks refactor is the biggest bet: making the fork fully async removes the need for async-specific template tags, but the release notes flag it as risky for existing Nunjucks users. The naming change is proceeding on the same timeline, so users tracking canary are absorbing an identity shift and an API shift at once.
◆ Prediction
Expect more v4 alphas carrying breaking removals before any beta, with the Nunjucks async refactor generating follow-up regressions; 3.x looks likely to keep receiving dependency-only patches with no core changes.
Customer.io
7.5MKT AUTO
Location becomes a trigger, Twilio stops being the only SMS path, and the LLM layer gets a memory
◆ Current state
The summer window widens both ends of the automation graph. On the input side, geofences turn physical entry and exit into workflow triggers and date triggers now read attributes off custom objects; on the output side, SMS opens to Sinch, Infobip, and Vonage instead of Twilio alone, and live notifications add a persistent, continuously updating message format on iOS and Android. The LLM side gains a workspace-scoped Knowledge Library that both LLM actions and the Agent can read, replacing per-prompt copy-paste. Channel-based message limits and unsubscribe-preserving profile merges tighten the send-side guardrails underneath all of it.
◆ Where it's heading
Customer.io is systematically loosening the assumptions its automation graph was built on: one workspace one app, one SMS vendor, one blunt frequency cap, prompts as the only place LLM context can live. Each release swaps a hardcoded shape for a configurable one, which is what a platform does when its largest accounts have outgrown the original model. The AI work follows the same instinct — not a chatbot bolted on, but retrieval and context turned into workspace-level objects that the rest of the system can reference.
◆ Prediction
Expect the Knowledge Library to spread past LLM actions into more of the Agent's surface, and the per-channel controls to keep filling in — the release notes name WhatsApp and SMS capping outside Twilio as a live gap, which is an odd thing to leave open right after opening SMS to three new vendors.
Alternatives to Eleventy 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 Eleventy or Customer.io.
Pimcore
Nearly every release in this window carries security hardening — Pimcore is working through an injection sweep.
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 Eleventy alternatives → · See all Customer.io alternatives →
Recent activity from Eleventy and Customer.io
Latest ship moves from both products, interleaved chronologically. ⚡ = editorial spark.
- 2d agoCustomer.ioAdd reusable knowledge sources to LLM actions ⚡
- 2d agoCustomer.ioSet up SMS with Sinch, Infobip, or Vonage
- 2d agoCustomer.ioSummer recap: geofences, live notifications, inbox, SMS providers
- 2d agoCustomer.ioGeofences: message people when they enter or exit a location ⚡
- 3d agoCustomer.ioSend push notifications to multiple mobile apps in one workspace
- 8d agoCustomer.ioLive notifications: real-time updates without opening your app
- 1mo agoEleventyNunjucks fork refactored onto a fully-async prerelease
- 1mo agoEleventyNode 22.15 minimum, page path properties removed
- 1mo agoEleventyHotfix for a layout cache invalidation regression
- 1mo agoEleventyEleventy v3.1.6: Everybody wants to do Maintenance
- 4mo agoEleventyCanary warns the Eleventy name is changing to Build Awesome ⚡
- 4mo agoEleventyDead tag: this release failed to publish, use 3.1.5
Frequently asked questions
What is the difference between Eleventy 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 Eleventy 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 Eleventy?
Top Eleventy alternatives in Mkt Auto are ranked by recent ship velocity. Browse the "Eleventy alternatives" section above for the current picks, or visit /alternatives/eleventy 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/customer-io for the full list with editorial commentary on each.