Companies Using Leadsy

Leadsy was the strangest page in this group to research, because there is no Leadsy to research. leadsy.ai has no website. What exists is a script at r2.leadsy.ai, and that script is Instantly's website-visitor pixel: its install check reports to api.instantly.ai, its messages name Instantly, and Instantly's cookie notice lists the host as its own. Our October 2026 crawl finds it on 6,608 live domains, 4,691 matched to a company, 8th in Visitor Identification with 2% of the category.

The rule is a single test: a page loads a script from r2.leadsy.ai. I checked it in a browser on 100 random domains from the set. 87 loaded the tag, 4 sat behind bot checks and 9 didn't, two of them dead sites. The count is sound.

Two months of history

The chart reads 4,586 domains in August 2026, 6,517 in September and 6,608 in October. We only started detecting this tag on 4 August, so August is a part-month and the jump to September is our coverage catching up. The domains we crawl also turn over every month, with dead sites dropping out and new ones added. Since 4 August, 887 domains dropped the tag on at least one hostname, and 205 of them still ran it on another when we re-checked.

"Leadsy isn't a vendor you can call. It's the address of Instantly's pixel, and the identification inside it is RB2B's. Three companies, one script tag." - Elif Arslan, CMO & Co-founder at TechnologyChecker.io

Sales signal: don't build a growth story on this page yet. Build a list. 6,600 domains of small B2B sellers who already pay to identify visitors is a clear segment.

What runs inside the tag

The script takes the site's account id and loads RB2B's OEM tracking script under one partner id shared by every Instantly customer. RB2B's guide says an OEM script can't run alongside RB2B's standard one, and Instantly's tag warns about exactly that. In my random sample, 67 of the 87 sites that loaded the tag fetched RB2B's script under Instantly's partner id. Three more sites, two of them one company's, were also running RB2B under their own keys, the conflict the warning describes.

That design also sets the geography. Instantly's help centre says the pixel only collects from confirmed US IP addresses and nothing from EU or Canadian visitors. Yet only 2,422 of the 4,691 matched companies are American. The United Kingdom has 440, India 212, Canada 193 and Germany 105.

Sales signal: the non-American half of this list is the opening for company-level tools. A London or Bangalore B2B firm running Leadsy is identifying its US visitors and nobody else, and a Leadfeeder or Leadinfo pitch fills that gap directly.

Accounts, forwarding domains and HighRadius

Each install carries its own account id in a data-pid attribute. Among the 79 sampled sites that exposed one, there were 75 different ids, so this is not an agency spraying one account across clients. The repeats come from forwarding. HighRadius, the finance-automation company, has 128 lookalike domains such as gohighradius.com and gohighradiusmail.com; every one I opened forwards to highradius.com and carries HighRadius's id. That is 1.92% of the clean set. First Choice Debt Solutions (39 domains) and Issuetrak (14) follow the same pattern. Across the set, 500 domains (7.48%) share their page title with at least two others. Lookalike domains like these are commonly used to send cold email, which fits Instantly's customers.

Sales signal: collapse forwarding domains before you count accounts. The lookalike fleets themselves are a signal, though: a company with 128 sending domains runs outbound at volume, and deliverability, data and SDR services sell to that.

Who buys it

56.33% of matched companies with a known size have 1 to 10 employees and 32.56% have 11 to 50. 43.22% were founded in the 2020s and 40.24% in the 2010s. Software Development leads industries at 15.03%, and agencies (Advertising and Marketing Services) make up 19.56%. The recognisable names are mostly software and services firms: HighRadius, PartnerStack, Darwinbox, SG Analytics, Lepaya, plus Frost & Sullivan on its careers pages and Instantly on its own site.

Sales signal: this is the founder-led outbound market. The buyer is usually the founder or the first sales hire, and the pitch that works is one that saves time on the next email, not a platform.

Leadfeeder and ZoomInfo on the same pages

414 Leadsy domains run Leadfeeder today and 356 run ZoomInfo. 82.8% and 76.2% of the domains ever seen with those pairs still have both, and none passes our switching tests. That fits the product split: Leadsy names American people, Leadfeeder and ZoomInfo name companies wherever the visitor is. 119 domains also run Leadinfo and 16 run Lead Forensics.

"414 sites run Leadsy and Leadfeeder side by side. They aren't comparing two tools. They bought one for people in America and one for companies everywhere else." - Elif Arslan, CMO & Co-founder at TechnologyChecker.io

Sales signal: for an identification vendor, the 5,700-plus Leadsy domains without one of these company-level tags are the upsell. For Instantly, the 414 Leadfeeder pairs are the accounts most likely to ask why they pay twice.

The stack around it

Google Analytics runs on 82.64% of the 6,682 clean live domains. Apollo's tracking script runs on 11.96%, against 2.03% on Leadinfo's domains, which marks these as outbound teams. Webflow (14.68%) and Framer (5.34%) are common next to WordPress (33.75%), and HubSpot's chat is on 8.05%.

Sales signal: Webflow and Framer agencies serving B2B startups reach a good share of this list. So do Apollo partners.

What it costs

Leadsy has no price of its own. Instantly's website-visitors page (14 October 2026) says you can start free with 25 credits, pay only for visitors resolved to a business email or LinkedIn profile, and get company-only matches free.

Sales signal: pay-per-resolution pricing makes the tag cheap to leave running. Expect many low-traffic installs that rarely resolve anyone, and qualify on traffic before you pitch.

Key takeaways

1. 6,608 live domains, 8th in Visitor Identification with 2%.

2. Leadsy is Instantly's pixel, running RB2B's OEM script underneath.

3. US-only identification, on a customer base where 2,422 of 4,691 matched companies are American.

4. Young, tiny buyers: 88.89% have 50 staff or fewer and 43.22% were founded this decade.

5. HighRadius alone has 128 forwarding domains; collapse them before counting accounts.

How to use this list

Filter by country to separate US sellers from the rest, then collapse forwarding domains. The full list of 6,608 Leadsy domains, with company, size and stack data, is on TechnologyChecker.io.