Companies Using Lead Forensics

Lead Forensics is the oldest-feeling tool in this group of pages, and the data backs the feeling. Our October 2026 crawl finds it on 4,439 live domains, 11th in Visitor Identification with 1.34% of the category. The buyers are British, mid-sized and established: half of the matched companies with a known founding year date from before 2000.

A domain counts when a page loads a script from leadforensics.com. I checked that in a browser on 98 random domains from the final set: 85 loaded Lead Forensics, 6 sat behind bot walls and 7 didn't, mostly forwarding domains whose destination didn't load it for us. The count is sound once one customer is taken out, and that customer is the first thing to explain.

One customer, 542 domains

Lead Forensics puts the customer's account number in the script address, so we can count accounts as well as domains. That is how the biggest distortion showed up. Informa, the events and publishing group, points its retired brand and event domains at informa.com, and every one of them loads Informa's account. Our title filter caught 359; the account number found 183 more, and the seven I opened all landed on informa.com. Together that is 542 domains, 10.9% of the 4,981 raw count, for one customer. We count Informa once, on informa.com, which takes the headline from 4,981 to 4,439 and the rank to 11th.

The rest of the census looks like ordinary customers. Before the cut, 4,118 domains showed a readable account number across 2,674 accounts; without Informa's 183 extra forwarders that is 3,935 domains on the same 2,674 accounts. The next-largest groups are small: dsm-firmenich's account covers 43 product domains, DALI's 24, Trifast's 21 and Rite-Hite's 18, each under 1% of the count.

"One publisher's forwarding domains were about one in nine Lead Forensics domains. Count accounts, not domains, and the tool looks like what it is: a few thousand mid-sized British and American sellers." - Elif Arslan, CMO & Co-founder at TechnologyChecker.io

Sales signal: roll the list up to account before you prospect. One Lead Forensics account is one buying decision, however many domains point at it.

Growth and churn

The usage chart starts at 4,439 in October 2026, because the Informa correction changed the base and earlier months included those domains. From here on, read movement with two causes in mind: the domains we crawl turn over every month, with dead sites dropping out and new ones added, and our detection widens over time. Since 16 March 2026, 842 domains dropped Lead Forensics on at least one hostname, and 116 of them still ran it on another hostname in October.

Sales signal: this is a stable pool of a few thousand domains, not a growth market. The leavers since March are the list for any rival with a cheaper or self-serve offer.

The Demandbase tag inside Lead Forensics

Demandbase shows on 29.26% of Lead Forensics domains in our stack data. That isn't a quarter of Lead Forensics customers buying an enterprise ABM platform. Lead Forensics' newer tracker defines Demandbase's partner tag with a single key, the same key in every account script I opened, loads tag.demandbase.com/partnertag.min.js and posts the answer to its own server. In our script records, 658 Lead Forensics domains load that partner tag; in my browser sample, 20 of 85 installs did. The older, shorter tracker doesn't.

Lead Forensics says it builds its IP database in-house. The partner call doesn't contradict that, but it shows the newer tracker asks Demandbase too. The same widget loader also imports BotD, FingerprintJS's open-source bot-detection library, from Lead Forensics' own CDN.

Sales signal: if you prospect Demandbase's install base from website tags, take Lead Forensics sites out first. Hundreds of those Demandbase detections are Lead Forensics' key, not a Demandbase contract.

Who buys it

11 to 50 employees is the largest band at 39.73%, then 1 to 10 at 27.86% and 51 to 200 at 23.32%. Leadinfo's buyers are smaller (44.61% have 10 or fewer staff) and Leadsy's smaller still. By age, only 2.88% were founded in the 2020s. Industries are spread thin, with IT Services and IT Consulting on top at 6.17%, but construction and three manufacturing groups add up to 16.08%. Smiths Group, Rite-Hite, Ahlstrom, Waupaca Foundry and Willmott Dixon are typical names; Willmott Dixon runs Leadinfo as well.

Geography is two markets. 1,695 of 3,514 matched companies are British (48.24%) and 1,135 American (32.3%). Canada, the Netherlands, Germany and Ireland follow far behind.

Sales signal: these are owner-managed industrial firms with a sales team on the phone. CRM, sales-training and outbound-calling services fit them better than self-serve software.

ZoomInfo on the same pages

The second tag on Lead Forensics sites is usually ZoomInfo. 261 domains run both today, and 77.7% of the 336 ever seen with both still do. Leadfeeder shares 166 domains, Leadinfo 92 and Leadsy 16. None of these pairs passes our switching tests.

"Lead Forensics customers who add a second tool pick ZoomInfo more than anything else, and three in four keep both. They're buying more data, not leaving." - Elif Arslan, CMO & Co-founder at TechnologyChecker.io

Sales signal: the 261 dual-tag domains pay twice for company identification. A consolidation pitch with a match-rate test is the obvious way in, for either vendor.

The stack around it

Google Analytics runs on 86.6% of the 4,439 domains and WordPress on 51.52%, with Elementor on 10.95% and the Divi theme on 4.03%. Salesforce (4.48%) is the most visible CRM tag. Lead Forensics Chat, on 3.11%, is the vendor's own chat widget.

Sales signal: WordPress agencies and Salesforce partners in the UK reach the core of this list.

What it costs

There is no price list. Lead Forensics' pricing page (14 October 2026) says the cost depends on website traffic, users are unlimited, and buyers start with a demo and a one-week free trial before a representative proposes a package.

Sales signal: quoted, traffic-based pricing means renewals are negotiated. Time a competing offer to the renewal, not to the trial.

Key takeaways

1. 4,439 live domains, 11th in Visitor Identification with 1.34%, after counting Informa once.

2. British (48.24%) and American (32.3%) buyers, half founded before 2000.

3. 2,674 accounts behind 3,935 readable domains (4,118 before Informa's 183 extra forwarders came out); no other group reaches 1%.

4. Demandbase on 29.26% of domains is Lead Forensics' own partner key.

5. ZoomInfo is the usual second tag, on 261 domains.

How to use this list

Filter by country and company size, then roll domains up to accounts. The full list of 4,439 Lead Forensics domains, with company, size and stack data, is on TechnologyChecker.io.