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Default among Y Combinator companies

Default was detected on 29 of 5,386 crawled Y Combinator company websites, a share of 0.5%.

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.

Software used by Y Combinator companies · Visitor Identification and ABM across all groups · Default across every group and the wider sample

Default runs on these Y Combinator companies

• PartnerStack
• Mezmo
• Alaan
• Tremendous
• Within
• Abacum
• Quo (fka OpenPhone)
• Hadrius
• Exa
• Rootly
• Tavus
• Warmly,
• Compound
• Artisan
• Paragon
• GrowthBook
• Aleph
• Arc
• Hyperbound
• Rollstack

20 of 29, ordered by team size, largest first.

<a href="https://installmap.com/groups/yc/default"><img src="https://installmap.com/badges/yc/default.svg" alt="Default runs on 29 of 5,386 crawled YC companies (0.5%)"></a>

[![Default runs on 29 of 5,386 crawled YC companies (0.5%)](https://installmap.com/badges/yc/default.svg)](https://installmap.com/groups/yc/default)

Other Visitor Identification and ABM tools in this group

• Apollo.io Tracker 3.2%
• RB2B 2.9%
• Vector 2.3%
• ZoomInfo WebSights 1.4%
• Warmly 1.3%
• Unify 1.2%
• Dealfront Leadfeeder 1.2%
• Snitcher 1.1%