Apollo71 customers
Used by 71 companies on usedby, 6 of them in HR & Recruiting. 2 also use UserGems. Compare UserGems and Apollo
Source: apollo.io, latest capture Oct 5, 2026.
5 of the 25 UserGems customers on usedby also use another tool on this list. The tools most often used by the same companies are Apollo (2 shared, 71 customers in all), ZoomInfo (2 shared, 67 customers in all), and Clay (2 shared, 48 customers in all).Latest check Oct 8, 2026: 395 of 412 public lines checked. Customer counts include every proof level, job-post signals included. Shared customers are counted on confirmed or observed lines on both tools.
5of 25
UserGems customers also use another tool on this list
Apollo shares the most companies with UserGems: 2 companies use both.
Ranked by shared customers
Tools of the same or a competing category, from another vendor, used by at least one company that also uses UserGems. A shared customer has a confirmed or observed line on both tools.
| # | Alternative | Shared with UserGems | Customers | Compare |
|---|---|---|---|---|
| 1 | ApolloMostly HR & Recruiting (6) | 2 | 71 | Compare UserGems vs Apollo |
| 2 |  ZoomInfo | 2 | 67 | Compare UserGems vs ZoomInfo |
| 3 |  Clay | 2 | 48 | Compare UserGems vs Clay |
| 4 |  Common RoomMostly DevTools & Infrastructure (26) | 1 | 68 | Compare UserGems vs Common Room |
ZoomInfo67 customers
Used by 67 companies on usedby. 2 also use UserGems. Compare UserGems and ZoomInfo
Latest capture across its sources: Oct 8, 2026.
Clay48 customers
Used by 48 companies on usedby. 2 also use UserGems. Compare UserGems and Clay
Source: clay.com, latest capture Oct 5, 2026.
Common Room68 customers
Used by 68 companies on usedby, 26 of them in DevTools & Infrastructure. 1 also uses UserGems. Compare UserGems and Common Room
Source: commonroom.io, latest capture Oct 7, 2026.
Other Sales Prospecting & Enrichment tools on usedby
Same category, with public customers, but no company named with UserGems yet.
Switch signals
A company that left one vendor's page and appeared on another's.
No switch publishedA switch needs a departure from one vendor's page, seen on two checks in a row, and a dated arrival on another. usedby does not publish departures yet, so no switch shows here.
By industry
Which of these tools the companies on usedby use, by industry. Each row counts the companies of that industry on usedby that use at least one of these tools.
| Industry | Most used | Next | Companies |
|---|---|---|---|
| DevTools & Infrastructure | Common Room70% | Clay14% | 37 companies |
| Marketing Tech | Clay32% | ZoomInfo27% | 22 companies |
| Data & Analytics | Common Room75% |  6sense15% | 20 companies |
| HR & Recruiting | Apollo40% | ZoomInfo33% | 15 companies |
| Cybersecurity | Common Room36% | Clay29% | 14 companies |
Read the first row as: among the 37 DevTools & Infrastructure companies on usedby that use one of these tools, 70% use Common Room. Shares can add up to more than 100% because some companies use two tools.
Questions about UserGems alternatives
Which tool shares the most customers with UserGems?
Apollo: 2 companies use both on usedby. Apollo has 71 customers in all. See who uses Apollo.
Do UserGems customers use other tools too?
5 of the 25 UserGems customers on usedby also use another tool on this list. Apollo shares the most: 2.
Which of UserGems and its alternatives do DevTools & Infrastructure companies on usedby use?
Among the 37 DevTools & Infrastructure companies on usedby that use one of these tools, 70% use Common Room. Clay comes next, with 14%.
Which of UserGems and its alternatives do Marketing Tech companies on usedby use?
Among the 22 Marketing Tech companies on usedby that use one of these tools, 32% use Clay. ZoomInfo comes next, with 27%.
How does usedby rank UserGems alternatives?
Only tools of the same or a competing category, from another vendor, count. They are ranked by shared customers: companies with a confirmed or observed line on both tools, from public pages, most with a dated capture. Tools with no shared customer are listed apart. Customer counts include every proof level, job-post signals included.