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Prospecting data & signals tools used by HR & Recruiting companies

Each line links its public proof and the date usedby last checked it.

22

HR & Recruiting companies use Prospecting data & signals tools

7 confirmed 14 observed 1 signal

The most used: Apollo (8), ZoomInfo (7), and Clay (4).Data as of Oct 24, 2026

Ranking

Tools ranked by the HR & Recruiting companies that use them. Ties go to the stronger proof.

Who uses each tool

Strongest proof first. A job post is a signal, the weakest proof.

  1. 1Apollo8 companies · Checked Oct 24, 20268
    0 confirmed 8 observed

    Apollo profile

  2. 2ZoomInfo7 companies · Checked Oct 24, 20267
    3 confirmed 3 observed 1 signal

    ZoomInfo profile

  3. 3Clay4 companies · Checked Oct 15, 20264
    3 confirmed 1 observed

    Clay profile

  4. 4UserGems2 companies · Checked Oct 8, 20262
    0 confirmed 2 observed

    UserGems profile

  5. 5Common Room1 company · Checked Oct 24, 20261
    1 confirmed 0 observed

    Common Room profile

  6. 66sense1 company · Checked Oct 15, 20261
    0 confirmed 1 observed

    6sense profile

How usedby counts

7 confirmed 14 observed 1 signal

A company counts once per tool, at its strongest proof: confirmed (a case study, a named testimonial, a press release or the company's own account), declared (the company told usedby), observed (a vendor logo wall or customers page) or signal (a job post). Counts cover the companies on usedby, never the whole market.

3 companies that sell software were left out, so a vendor is never counted as a user.

Data as of October 24, 2026.

Questions

Which Prospecting data & signals tools do HR & Recruiting companies use most?

Apollo leads: 8 of the 22 HR & Recruiting companies on usedby that use Prospecting data & signals tools use it. Next: ZoomInfo (7), Clay (4), UserGems (2), and Common Room (1). See Apollo.

How many HR & Recruiting companies use Prospecting data & signals tools?

22 HR & Recruiting companies on usedby use at least one of 6 Prospecting data & signals tools. It counts the companies usedby tracks.

What proof backs these lines?

Of the 22 companies, each counted at its strongest proof: 7 confirmed, 0 declared, 14 observed and 1 known from a job post.

How does usedby build this ranking?

usedby counts each HR & Recruiting company once per tool, from public proof: case studies, press releases, the company's own site or its declaration to usedby, vendor customer pages and job posts. 3 software vendors are left out. Every line shows its proof and the date usedby last checked it.