Findings / Workspace SaaS visible in DNS← AI tools with a verified domainWho sends email for them →
07 / 10 · Workspace SaaS visible in DNS · 1,828 YC startups
Anthropic (8.3%) and OpenAI (4.3%) are the most-verified tools. Most tools need no DNS record at all, so these are lower bounds.
| Label | Share | Value |
|---|---|---|
 Anthropic | 8.3% | |
 OpenAI | 4.3% | |
 Slack | 3.5% | |
 Notion | 2.6% | |
 Cursor | 1.8% | |
 Zoom | 1.7% | |
 1Password | 1.4% | |
 Tailscale | 1.2% | |
 Cloudflare dashboard SSO | 1.0% | |
 Atlassian | 1.0% |
How it was measured
A company can appear in several bars.
Sample
1,828 of 1,873 listed YC startups, W24–F26. Medium confidence and up. Methodology