Prospecting, CRM, and sales agents
852 companies on usedby use at least one of the 37 tools in this category with a public customer. Apollo leads with 71 companies. Then come Common Room (68) and ZoomInfo (67). 118 companies run two of these tools or more. The most common pair is Clay with Nooks (8 companies).Latest check Oct 8, 2026: 993 of 1,049 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.
852
companies on usedby use a tool of this category
Companies per tool. A company using two tools counts for both.
Counts include job-post signals, drawn apart on each tool page.
Companies with a public line for each tool. Job-post signals count and are drawn apart in the proof bar.
| # | Tool | Customers | Proof |
|---|---|---|---|
| 1 |  Apollo | 71 | |
| 2 |  Common Room | 68 | |
| 3 |  ZoomInfo | 67 | |
| 4 |  Amplemarket | 60 | |
| 5 |  Nooks | 55 | |
| 6 |  HubSpot | 51 | |
| 7 |  Clay | 48 | |
| 8 |  Hyperbound | 44 | |
| 9 |  Gong | 40 | |
| 10 |  Qualified | 38 | |
| 11 |  Outreach | 35 | |
| 12 |  6sense | 32 | |
| 13 |  Yoodli | 31 | |
| 14 |  Warmly | 30 | |
| 15 |  11x | 27 | |
| 15 |  Modjo | 27 | |
| 17 |  Aviso | 25 | |
| 17 |  UserGems | 25 | |
| 19 |  Attention | 24 | |
| 20 |  Mindtickle | 23 | |
| 21 |  SecondNature | 21 | |
| 22 |  1mind | 20 | |
| 22 |  Attio | 20 | |
| 22 |  Backstory | 20 | |
| 25 |  Rox | 19 | |
| 25 |  Sybill | 19 | |
| 27 |  Salesforge | 18 | |
| 28 |  Salesloft | 15 | |
| 29 |  Actively | 11 | |
| 29 |  Avoma | 11 | |
| 29 |  Clari | 11 | |
| 29 |  Invoca | 11 | |
| 33 |  Day AI | 10 | |
| 34 |  Artisan | 9 | |
| 35 |  Lavender | 6 | |
| 36 |  Vivun | 4 | |
| 37 |  Regie | 3 | |
 Conversica | — | ||
 Landbase | — |
118 companies run two of these tools or more. The most common pair is Clay with Nooks, at 8 companies.
Apollo71 customersApollo is used by 71 companies on usedby, 63 confirmed by a case study, a named quote or a press release. Named customers include Google, Intel, and Spotify. Who uses Apollo, Apollo vs Clay
Customer page: apollo.io. Latest check of 71 of 71 lines: Oct 5, 2026.
Common Room68 customersCommon Room is used by 68 companies on usedby, 33 confirmed by a case study, a named quote or a press release. Named customers include Amazon, Atlassian, and Asana. Who uses Common Room, Common Room vs ZoomInfo
Customer page: commonroom.io. Latest check of 68 of 68 lines: Oct 7, 2026.
ZoomInfo67 customersZoomInfo is used by 67 companies on usedby, 47 confirmed by a case study, a named quote or a press release. Named customers include Meta, Microsoft, and Amazon. Who uses ZoomInfo, HubSpot vs ZoomInfo
Latest check of 67 of 67 lines: Oct 8, 2026.
Amplemarket60 customersAmplemarket is used by 60 companies on usedby, 49 confirmed by a case study, a named quote or a press release. Named customers include Deel, Vanta, and Fivetran. Who uses Amplemarket
Customer page: amplemarket.com. Latest check of 60 of 60 lines: Oct 7, 2026.
Companies on usedby per category, and the tools with a public customer.
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.
Apollo, used by 71 of the 852 companies on usedby in this category. Then come Common Room (68) and ZoomInfo (67). Who uses Apollo.
Apollo: 71 companies on usedby, against 68 for Common Room. 2 companies use both, counting confirmed and observed lines only.
Yes: 118 of the 852 companies on usedby in this category run two or more. The most common pair is Clay with Nooks (8 companies).
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. Job-post signals count in the totals and are shown apart. usedby lists a company when a public page shows it, so these counts describe the companies on usedby, not the whole market.