Home / Groups / Y Combinator companies / Rewardful
Rewardful among Y Combinator companies
Rewardful was detected on 43 of 5,388 crawled Y Combinator company websites, a share of 0.8%. Crawled 4 September 2026.
- 43running Rewardful
- 0.8%share
- 5,388crawled
- 9columns
installmap-yc-rewardful.csv43 rows, 9 columns
| Domain | Name | Batch |
|---|---|---|
| codingal.com | Codingal | Winter 2021 |
| doublehq.com | Double | Summer 2021 |
| vendoo.co | Vendoo | Winter 2022 |
| sendblue.com | Sendblue | Summer 2023 |
| sully.ai | Sully.ai | Summer 2021 |
| haddock.app | haddock | Winter 2022 |
| gumloop.com | Gumloop | Winter 2024 |
| raycast.com | Raycast | Winter 2020 |
8 of the 43 rows, 3 of the 9 columns.
Rewardful runs on these Y Combinator companies
- Codingal
- Double
- Vendoo
- Sendblue
- Sully.ai
- haddock
- Gumloop
- Raycast
- Vector
- Wondercraft
- Zaymo
- Topo
- Clickfacts
- Julius
- Malloc Inc
- Mem0
- Rosebud AI
- Vimmerse
- Dashworks
- Shimmer
20 of 43, ordered by team size, largest first. The CSV has all 43.
Rewardful across the groups
| Group | Crawled | Running Rewardful | Share |
|---|---|---|---|
| Inc 5000 (2026) | 4,888 | n/a | n/a |
| Y Combinator companies | 5,388 | 43 | 0.8% |
| 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 | 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 1 of the 5 Affiliate and Referral tools published for this group.
Software used by Y Combinator companies · Affiliate and Referral across all groups · Rewardful across every group and the wider sample
Source: Installmap crawl, 4 September 2026
Badge
<a href="https://installmap.com/groups/yc/rewardful"><img src="https://installmap.com/badges/yc/rewardful.svg" alt="Rewardful is the most detected Affiliate tool among Y Combinator companies: 43 of 5,388 crawled YC companies (0.8%)"></a>
[](https://installmap.com/groups/yc/rewardful)
Badge URL: https://installmap.com/badges/yc/rewardful.svg · all badges.
Questions
How many Y Combinator companies use Rewardful?
43 of the 5,388 Y Combinator company websites we crawled on 4 September 2026, a share of 0.8%.
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 43 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 20 rows from this list with all 9 columns.
Is this every Y Combinator company using Rewardful?
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 Rewardful without it showing there is not counted. Method.
Cite this
Installmap, Rewardful among Y Combinator companies, crawl of 4 September 2026, https://installmap.com/groups/yc/rewardful.
Other Affiliate and Referral tools in this group
- FirstPromoter 0.4%
- Tolt 0.2%
- Awin 0.1%
- PromoteKit 0.1%
- PartnerStack 0.1%