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OptinMonster among Y Combinator companies

OptinMonster was detected on 14 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 4 of the 5 Popups and Widgets tools published for this group.

Software used by Y Combinator companies · Popups and Widgets across all groups · OptinMonster across every group and the wider sample

OptinMonster runs on these Y Combinator companies

• Guesty
• Vanta
• Scale AI
• Cyble
• Postscript
• Humi
• FileStack
• MyVR
• Prenda
• Finmark
• LendEDU
• Debteye
• Vastrm
• Iris Automation

14 of 14, ordered by team size, largest first.

<a href="https://installmap.com/groups/yc/optinmonster"><img src="https://installmap.com/badges/yc/optinmonster.svg" alt="OptinMonster runs on 14 of 5,386 crawled YC companies (0.3%)"></a>

[![OptinMonster runs on 14 of 5,386 crawled YC companies (0.3%)](https://installmap.com/badges/yc/optinmonster.svg)](https://installmap.com/groups/yc/optinmonster)

Other Popups and Widgets tools in this group

• Embedly 0.8%
• ShareThis 0.3%
• Elfsight 0.3%
• AddToAny 0.1%
• OneSignal 0.1%
• OptiMonk 0.1%