Home / Groups / Y Combinator companies / OptinMonster
OptinMonster among Y Combinator companies
OptinMonster was detected on 14 of 5,388 crawled Y Combinator company websites, a share of 0.3%. Crawled 4 September 2026.
- 14running OptinMonster
- 0.3%share
- 5,388crawled
- 9columns
installmap-yc-optinmonster.csv14 rows, 9 columns
| Domain | Name | Batch |
|---|---|---|
| guesty.com | Guesty | Winter 2014 |
| vanta.com | Vanta | Winter 2018 |
| scale.com | Scale AI | Summer 2016 |
| cyble.com | Cyble | Winter 2021 |
| postscript.io | Postscript | Winter 2019 |
| humi.ca | Humi | Winter 2017 |
| filestack.com | FileStack | Summer 2012 |
| myvr.com | MyVR | Winter 2012 |
8 of the 14 rows, 3 of the 9 columns.
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. The CSV has all 14.
Installmap's list of all 1,393 companies using OptinMonster, found on the homepage, in a job post or on a Shopify storefront, holds 15 Y Combinator companies, with industry, employees, country and up to three named contacts per company: Companies using OptinMonster, $99 one-time.
OptinMonster across the groups
| Group | Crawled | Running OptinMonster | Share |
|---|---|---|---|
| Inc 5000 (2026) | 4,888 | 26 | 0.5% |
| Y Combinator companies | 5,388 | 14 | 0.3% |
| Fortune 500 | 472 | <5 | <5 |
| Unicorns | 1,000 | 7 | 0.7% |
| SaaS companies | 8,048 | 60 | 0.7% |
| Tranco top 10,000 | 1,572 | n/a | n/a |
5,388 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, 146 from a plain fetch only, and 745 returned no usable record. Email hosting and email security are read from each domain's MX and SPF records, for the same domains. 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
Source: Installmap crawl, 4 September 2026
Badge
<a href="https://installmap.com/groups/yc/optinmonster"><img src="https://installmap.com/badges/yc/optinmonster.svg" alt="OptinMonster runs on 14 of 5,388 crawled YC companies (0.3%)"></a>
[](https://installmap.com/groups/yc/optinmonster)
Badge URL: https://installmap.com/badges/yc/optinmonster.svg · all badges.
Questions
How many Y Combinator companies use OptinMonster?
14 of the 5,388 Y Combinator company websites we crawled on 4 September 2026, a share of 0.3%.
What does a row hold?
domain, name, batch, year, industry, subindustry, status, team size, location. One row per company domain, 9 columns.
What do I get after paying?
One UTF-8 CSV with a header row and all 14 rows. The download link opens right after the card payment and stays valid, so you can download again later.
How does the free sample work?
Enter your email above and we send a link to a CSV of 14 rows from this list with all 9 columns.
Is this every Y Combinator company using OptinMonster?
No. 5,388 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, 146 from a plain fetch only, and 745 returned no usable record. Email hosting and email security are read from each domain's MX and SPF records, for the same domains. Company list: Y Combinator company directory. A company that uses OptinMonster without it showing there is not counted. Method.
Cite this
Installmap, OptinMonster among Y Combinator companies, crawl of 4 September 2026, https://installmap.com/groups/yc/optinmonster.