Customer relationship management systems where teams keep accounts, contacts and deals, with AI built in.
83
companies on usedby use a tool of this category
83 companies on usedby use at least one of the 3 tools in this category with a public customer. HubSpot leads with 54 companies. Then come Attio (20) and Day AI (10). 1 company runs two of these tools or more. The most common pair is HubSpot with Day AI (1 company).Latest check Oct 15, 2026: 80 of 84 public lines checked. Counts are of companies on usedby, not of the whole market: we list a company when a public page shows its AI tools.
Companies with a public line for each tool. Job-post signals count and are drawn apart in the proof bar.
| # | Tool | Customers | Proof |
|---|---|---|---|
| 1 |  HubSpot | 54 | |
| 2 |  Attio | 20 | |
| 3 | Day AI | 10 |
1 company runs two of these tools or more. The most common pair is HubSpot with Day AI, at 1 company.
HubSpotHubSpot is used by 54 companies on usedby, 12 confirmed by a case study, a named quote or a press release. Customers include Doordash, Kelly Services, and Casio. Who uses HubSpot, Attio vs HubSpot
Customer page: hubspot.com. Latest check of 52 of 54 lines: Oct 15, 2026.
AttioAttio is used by 20 companies on usedby, 8 confirmed by a case study, a named quote or a press release. Customers include Union Square Ventures, Passionfroot, and Taskrabbit. Who uses Attio, Attio vs HubSpot
Customer page: attio.com. Latest check of 18 of 20 lines: Oct 5, 2026.
Day AI is used by 10 companies on usedby, 0 confirmed by a case study, a named quote or a press release. Customers include Netlify, AdQuick, and Alloy. Who uses Day AI, Day AI vs HubSpot
Customer page: day.ai. Latest check of 10 of 10 lines: Oct 10, 2026.
Companies first listed by a tool of this category in the last 90 days.
Side-by-side pages with the companies behind each tool.
Answers drawn from usedby data.
HubSpot, used by 54 of the 83 companies on usedby in this category. Then come Attio (20) and Day AI (10). Who uses HubSpot.
HubSpot: 54 companies on usedby, against 20 for Attio.
Yes: 1 of the 83 companies on usedby in this category run two or more. The most common pair is HubSpot with Day AI (1 company).
By the number of companies with a public line for each tool, read from dated captures of vendor customer pages, case studies, press releases and job posts. Every proof level counts in the totals and the ranking, job-post signals included (the weakest proof, shown apart in the proof bar); ties go to the stronger proofs. usedby lists a company when a public page shows it, so these counts describe the companies on usedby, not the whole market.