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Prospecting data & signals tools used by Professional Services companies

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

42

Professional Services companies use Prospecting data & signals tools

12 confirmed 28 observed 2 signals

The most used: ZoomInfo (14), Apollo (11), and Clay (6).Data as of Oct 25, 2026

Ranking

Tools ranked by the Professional Services companies that use them. Ties go to the stronger proof.

Largest and best-proven users

Two labelled views of the same companies. Neither is a score.

Largest companies

By employee range. Size known for 27 of 42.

  • WorkdayObserved10,001+ employeesChecked Oct 24, 2026
  • ADPObserved10,001+ employeesChecked Oct 24, 2026
  • Thomson ReutersObserved10,001+ employeesChecked Oct 24, 2026

Strongest proof

Confirmed or declared: 12 of 42. This view filters what you read, never what is counted.

  • TotalSDSConfirmed1–50 employeesChecked Oct 24, 2026
  • TrustArcConfirmed201–1,000 employeesChecked Oct 24, 2026
  • CoverflexConfirmedChecked Oct 24, 2026

Who uses each tool

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

  1. 1ZoomInfo14 companies · Checked Oct 24, 202614
    4 confirmed 8 observed 2 signals

    ZoomInfo profile

    Show 4 more companies
  2. 2Apollo11 companies · Checked Oct 24, 202611
    0 confirmed 11 observed

    Apollo profile

    Show 1 more company
  3. 3Clay6 companies · Checked Oct 24, 20266
    5 confirmed 1 observed

    Clay profile

  4. 4UserGems6 companies · Checked Oct 25, 20266
    0 confirmed 6 observed

    UserGems profile

  5. 5Warmly3 companies · Checked Oct 24, 20263
    2 confirmed 1 observed

    Warmly profile

  6. 66sense3 companies · Checked Oct 24, 20263
    0 confirmed 3 observed

    6sense profile

  7. 7Common Room1 company · Checked Oct 24, 20261
    1 confirmed 0 observed

    Common Room profile

How usedby counts

12 confirmed 28 observed 2 signals

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.

No software vendor had to be left out.

Data as of October 25, 2026.

Questions

Which Prospecting data & signals tools do Professional Services companies use most?

ZoomInfo leads: 14 of the 42 Professional Services companies on usedby that use Prospecting data & signals tools use it. Next: Apollo (11), Clay (6), UserGems (6), and Warmly (3). See ZoomInfo.

How many Professional Services companies use Prospecting data & signals tools?

42 Professional Services companies on usedby use at least one of 7 Prospecting data & signals tools. It counts the companies usedby tracks.

What proof backs these lines?

Of the 42 companies, each counted at its strongest proof: 12 confirmed, 0 declared, 28 observed and 2 known from a job post.

How does usedby build this ranking?

usedby counts each Professional Services 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. Every line shows its proof and the date usedby last checked it.

Prospecting data & signals by industry within Professional Services