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%.
| Group | Crawled | Running Customer.io | Share |
|---|---|---|---|
| Inc 5000 (2026) | 4,885 | n/a | n/a |
| Y Combinator companies | 5,386 | 18 | 0.3% |
| Fortune 500 | 472 | n/a | n/a |
| Unicorns | 1,000 | n/a | n/a |
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. 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 four groups · Customer.io across every group and the wider sample
Badge
<a href="https://installmap.com/groups/yc/customer-io"><img src="https://installmap.com/badges/yc/customer-io.svg" alt="Customer.io runs on 0.3% of Y Combinator companies, 18 of 5,386 crawled companies"></a>
[](https://installmap.com/groups/yc/customer-io)
Badge URL: https://installmap.com/badges/yc/customer-io.svg · all badges.
Cite
Customer.io was detected on 18 of 5,386 crawled Y Combinator company websites (0.3%). Installmap, 4 September 2026, https://installmap.com/groups/yc/customer-io.