Home / Groups / Y Combinator companies / Customer.io

Customer.io among Y Combinator companies

Customer.io was detected on 18 of 5,386 crawled Y Combinator company websites, a share of 0.3%.

5,386 of 6,133 Y Combinator domains returned a usable record and form the denominator. 5,242 were counted from a rendered homepage crawl on 4 September 2026, 144 from a plain fetch only, and 747 returned no usable record. Company list: Y Combinator company directory. <5 means fewer than 5 crawled domains in that group. Rank 5 of the 5 CRM and Marketing Automation tools published for this group.

Software used by Y Combinator companies · CRM and Marketing Automation across all groups · Customer.io across every group and the wider sample

Customer.io runs on these Y Combinator companies

• Squire Technologies
• FUTURA
• Compound
• Tutorspree
• Lugg
• Paperspace
• doola
• SimplyInsured
• Dagger
• Impactive (formerly Outvote)
• RescueTime
• yhangry
• Watsi
• StartPlaying.Games
• Trusty
• Jemi
• Lilia
• Zorba

18 of 18, ordered by team size, largest first.

<a href="https://installmap.com/groups/yc/customer-io"><img src="https://installmap.com/badges/yc/customer-io.svg" alt="Customer.io runs on 18 of 5,386 crawled YC companies (0.3%)"></a>

[![Customer.io runs on 18 of 5,386 crawled YC companies (0.3%)](https://installmap.com/badges/yc/customer-io.svg)](https://installmap.com/groups/yc/customer-io)

Other CRM and Marketing Automation tools in this group

• HubSpot 11.2%
• Marketo 1.2%
• Mailchimp 0.9%
• Klaviyo 0.8%
• ActiveCampaign 0.3%
• Salesforce Pardot 0.2%
• Salesforce Web-to-Lead 0.1%
• Zoho CRM Forms 0.1%