Companies Using D3

I spend a lot of my time on what our detection rules can and cannot see, and D3 is a good example of why that matters. Our October 2026 crawl finds D3 on 20,719 sites, and we matched 11,646 of them to a company. That number describes one way of shipping D3, the script tag, and says little about the bundled applications where much modern D3 code lives.

What the rule sees, and what it misses

We count a site when a page loads d3.js or d3.min.js, requests a file from d3js.org, or exposes the global d3.version. D3's getting-started guide recommends a CDN-hosted ES module bundle for plain HTML and an npm install for applications. Neither leaves a d3.js file or a global behind, so React, Svelte and other bundled apps that import D3 modules are mostly invisible to us. The visible part is classic: jQuery runs on 87.62% of the 20,919 live D3 domains in our stack analysis, Moment.js on 30.91% and Underscore.js on 25.35%, while React reaches only 5.44%.

Sales Signal: read a D3 detection as "this site ships hand-built visualisations the older way." For the modern, bundled D3 market, use framework and hiring signals instead of this list.

Growth trajectory

The current window runs from 13,779 sites in June 2026 to 20,719 in October, a 50% rise I wouldn't call adoption. Counts are not a like-for-like series: the set of domains we crawl turns over every month, with dead sites dropping out and newly found ones added, and our detection signals widen over time. The curve has flattened too, adding 183 sites between September and October. Exits are real but modest: 2,453 domains dropped D3 since we began tracking it in March 2026, and when we re-checked, 377 of 2,481 such domains still ran it on another hostname.

"Our D3 number is a count of script tags. D3 compiled into a modern app doesn't announce itself, so the real installed base is larger than anything a crawler can count from outside." - David Thomson, CTO at TechnologyChecker.io

Sales Signal: this is a mature, stable base. Plan for maintenance and replacement work on existing visualisations, not greenfield adoption.

One vendor makes real estate the top industry

Real Estate leads our industry chart at 10.03%, which looked wrong for a developer library until we checked it. 829 of the 1,030 real-estate companies matched to D3 also run iHomefinder, a CRM, IDX property-search and website platform for agents. In a browser, iHomefinder's WordPress bundle from idxhome.com turned out to contain D3 version 3.5.6, released in July 2015, and to expose it as the global our rule reads. Across all D3 sites iHomefinder appears on about 2,150 domains, roughly one in ten. Take those out and real estate falls to about 200 companies, behind software development (642) and IT services (560).

Sales Signal: the estate agents on this list did not choose D3; iHomefinder did. They are prospects for real-estate marketing tools, not developer tooling, and the D3 decision for those sites sits with iHomefinder.

Who chose D3

The deliberate users cluster around published data. The US Census Bureau loads D3 6.2.0 on census.gov, Brazil's statistics office IBGE uses it in its SIDRA tables, and the World Bank's open-data site runs 3.5.6. Lockheed Martin's sustainability site (7.8.2), the NFL's Next Gen Stats (7.9.0, straight from d3js.org) and Jefferies' homepage (7.9.0) show current versions in commercial use. Two platforms show up repeatedly among large organisations: university research portals built on Elsevier's Pure, where Manchester and Queen's University Belfast both load D3 3.5.5, and careers sites, where 7-Eleven and USAA both pull D3 7.9.0 from the same recruitment-site host. Many of these installs are old. Of the 17 enterprise pages where we could read a version, 9 ran D3 3.x or older, a line replaced by version 4 in June 2016; MD Anderson Cancer Center still loads 2.10.3.

Sales Signal: a D3 3.x install on a public data portal is technical debt that someone owns. Front-end modernisation and data-visualisation agencies have a concrete opener in the version number.

Industry and geography

Beyond real estate, the spread is developer-led: Software Development (6.26%) and IT Services and IT Consulting (5.46%) together make 11.72%, then Financial Services (3.5%), Technology, Information and Internet (3.3%) and Higher Education (2.88%). Government Administration (2.27%, 233 companies) fits the statistics and open-data portals above. The United States leads with 3,962 matched companies, about five times the United Kingdom (765), then Germany (558), Brazil (503) and India (417). By size, 51.82% have 1-10 employees, but 496 companies have more than 1,000.

Sales Signal: the strongest D3 accounts are public bodies, universities and research-heavy enterprises in the US, UK and Germany, where visualisation is part of what they publish.

Overlap with other charting libraries

Our switching table for D3 is empty: no corridor passed our tests, mainly because most domains that ever ran D3 with a rival still run both. 1,773 domains run D3 and Chart.js today, 829 run it with Highcharts, 209 with ApexCharts.js, 111 with ECharts, 44 with Google Charts and 8 with Recharts. Of the 2,050 domains we have ever seen running D3 and Chart.js together, 86.5% still run both.

"D3 rarely loses a site to another library. It gains a neighbour: 1,773 of the 2,050 domains we've seen running D3 with Chart.js still run both." - David Thomson, CTO at TechnologyChecker.io

Sales Signal: a vendor pitching "replace D3" is arguing against the data. The better pitch goes to teams maintaining two charting stacks who might want one supported library for routine charts.

The stack around it

WordPress runs on 35.04% of D3 domains and Elementor on 10.29%. Two numbers need a warning. Leaflet (14.79%) and Zone.js (13.19%) look like map builds and Angular apps, but about seven in ten of the sites behind each also run iHomefinder, so both mostly trace back to the same property-search widget. Google Analytics is on 59.09%, Mapbox GL JS on 1.82% and OpenLayers on 0.41%.

Sales Signal: if you sell to deliberate D3 users, exclude iHomefinder sites first. Otherwise Leaflet and Zone.js make the list look more map-heavy and more Angular than it is.

Key takeaways

• 20,719 sites in October 2026, #4 of 55 in charting with a 4.25% share, and a floor, because bundled apps are invisible.
• About one in ten D3 sites is an iHomefinder real-estate site carrying D3 3.5.6, which is why Real Estate tops the industry chart.
• Deliberate use clusters on data publishing: statistics offices, the World Bank, research portals, sports stats.
• Old versions are common: 9 of 17 enterprise pages ran D3 3.x or older.
• No switching corridor. D3 coexists with Chart.js on 1,773 domains.

Sales applications

Targeting: on TechnologyChecker.io, filter D3, exclude iHomefinder IDX, then keep Government Administration, Higher Education, Software Development and Financial Services. That isolates teams who write D3 themselves.

Outreach: "Your [portal] still loads D3 3.5, which predates version 4 (2016). We move public data visualisations to current D3 or a maintained charting library without breaking the charts people already link to."

Competitive angle: the 1,773 sites running D3 and Chart.js side by side are the natural audience for one supported charting library.

The full list of 20,719 D3 sites and 11,646 matched companies is on TechnologyChecker.io.