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Companies / Ellii (formerly ESL Library) / Customer.io

Does Ellii (formerly ESL Library) use Customer.io?

Yes

We hold strong evidence for this.

  • The company names it in its own subprocessor list, a statement that this vendor handles its customers' data.

How we know

Subprocessor listProcesses data for the company11 Nov 2026Source

About Ellii (formerly ESL Library)

Ellii provides ready-made English language lessons, grammar materials, and teaching tools for English teachers. It serves teachers of young learners, teens, and adults, including advanced learners and literacy students.

Summarized from its homepage on 4 Nov 2026.

Education

What else Ellii (formerly ESL Library) uses

Ellii (formerly ESL Library) has evidence for 16 vendors. The strongest:

RecurlyStripeAmazon Web ServicesFusionAuthHelp ScoutHerokuPipedriveCloudflare

See the full Ellii (formerly ESL Library) tech stack

Other companies using Customer.io

17hats17hats.com17hats University17hatsuniversity.comAaruaaru.comAboonaboon.comadam.aiAgatonagaton.aiailucius.comAI Repliesaireplies.com

All 244 companies using Customer.io

Check any company's vendors in seconds

See Ellii (formerly ESL Library)'s full stack with a source for every vendor, and ask the same question about any company from the API, Claude or your browser.

  • Every company and vendor, with its public source
  • 100 API calls a month, plus MCP and the Chrome extension
  • Work email only. No card, no sales call