Home / Groups / Y Combinator companies / FirstPromoter
FirstPromoter among Y Combinator companies
FirstPromoter was detected on 19 of 5,388 crawled Y Combinator company websites, a share of 0.4%. Crawled 4 September 2026.
- 19running FirstPromoter
- 0.4%share
- 5,388crawled
- 9columns
installmap-yc-firstpromoter.csv19 rows, 9 columns
| Domain | Name | Batch |
|---|---|---|
| getmagic.com | Magic | Winter 2015 |
| mailmodo.com | Mailmodo | Summer 2021 |
| haddock.app | haddock | Winter 2022 |
| writesonic.com | Writesonic | Summer 2021 |
| hellobonsai.com | Bonsai | Winter 2016 |
| clueso.io | Clueso | Winter 2023 |
| hypotenuse.ai | Hypotenuse AI | Summer 2020 |
| dartai.com | Dart | Winter 2022 |
8 of the 19 rows, 3 of the 9 columns.
FirstPromoter runs on these Y Combinator companies
- Magic
- Mailmodo
- haddock
- Writesonic
- Bonsai
- Clueso
- Hypotenuse AI
- Dart
- Draftbit
- Reacher
- Coinrule
- AnswerThis
- VideoGen
- Carousel Technologies
- DGI Apparel
- YouArt
- Couple
- Docucharm
- Firebender
19 of 19, ordered by team size, largest first. The CSV has all 19.
FirstPromoter across the groups
| Group | Crawled | Running FirstPromoter | Share |
|---|---|---|---|
| Inc 5000 (2026) | 4,888 | 7 | 0.1% |
| Y Combinator companies | 5,388 | 19 | 0.4% |
| Fortune 500 | 472 | n/a | n/a |
| Unicorns | 1,000 | n/a | n/a |
| SaaS companies | 8,048 | 31 | 0.4% |
| Tranco top 10,000 | 1,572 | <5 | <5 |
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 2 of the 5 Affiliate and Referral tools published for this group.
Software used by Y Combinator companies · Affiliate and Referral across all groups · FirstPromoter across every group and the wider sample
Source: Installmap crawl, 4 September 2026
Badge
<a href="https://installmap.com/groups/yc/firstpromoter"><img src="https://installmap.com/badges/yc/firstpromoter.svg" alt="FirstPromoter runs on 19 of 5,388 crawled YC companies (0.4%)"></a>
[](https://installmap.com/groups/yc/firstpromoter)
Badge URL: https://installmap.com/badges/yc/firstpromoter.svg · all badges.
Questions
How many Y Combinator companies use FirstPromoter?
19 of the 5,388 Y Combinator company websites we crawled on 4 September 2026, a share of 0.4%.
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 19 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 19 rows from this list with all 9 columns.
Is this every Y Combinator company using FirstPromoter?
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 FirstPromoter without it showing there is not counted. Method.
Cite this
Installmap, FirstPromoter among Y Combinator companies, crawl of 4 September 2026, https://installmap.com/groups/yc/firstpromoter.
Other Affiliate and Referral tools in this group
- Rewardful 0.8%
- Tolt 0.2%
- Awin 0.1%
- PromoteKit 0.1%
- PartnerStack 0.1%