What Is Chart.js?
LibraryChart.js is an open-source JavaScript charting library that draws responsive bar, line, pie, radar and scatter charts on an HTML canvas element. It is the most widely used general-purpose chart library on the web and has official wrappers for React, Vue and Angular.
Detect Chart.js on any website:
Why Chart.js Matters
Libraries and third-party services are where a site's real behaviour lives: analytics, payments, auth, UI components and animation all arrive as scripts the browser can see. Knowing that Chart.js is on a page tells you about its dependencies, its privacy footprint, and sometimes its build pipeline — and it helps you tell template-driven stacks from hand-assembled ones. Our detector is scanning the web for Chart.js signals continuously — real examples appear below as they're discovered.
Does Chart.js Mean a Site Was Built With AI?
Chart.js on its own does not prove AI involvement.
Standard modern web tooling — its presence alone doesn't indicate AI-assisted development.
How this feeds the score: builder fingerprints, bundle artifacts and AI-tool traces are weighed separately from stack context like frameworks, libraries and hosting. The full breakdown is on How scores work.
How Websites Using Chart.js Work
- Canvas-based rendering with eight built-in chart types
- Declarative configuration object (data, options, plugins)
- Responsive resizing and animation out of the box
- Wrapper packages such as react-chartjs-2 and vue-chartjs
Best Practices When Working With Chart.js
Based on patterns in our scan dataset and the detection evidence tiers.
- →Start by running a Chart.js detection scan on any URL you're evaluating — the 80+ signal engine returns a confidence score plus the exact markers it matched, which beats reading view-source by hand.
- →Cross-check the result against the full detection evidence in /how-scores-work — confidence tiers tell you whether a match is strong (headers + scripts) or circumstantial (a single HTML pattern).
How we detect Chart.js — see our methodology: AI Influence Score calculation, evidence tiers, and fingerprint signal types.
How Our Detector Identifies Chart.js
Our scanner analyzes multiple layers of a website's technical fingerprint to detect Chart.js usage.
- Script URLs referencing chart.js, chart.umd.js or cdn.jsdelivr.net/npm/chart.js
- Canvas elements driven by a global `Chart` constructor in page scripts
Websites Built With Chart.js
Real sites detected by our scanner
No examples detected yet — scan any Chart.js website to add it.
Frequently Asked Questions About Chart.js
What is Chart.js?+
Chart.js is an open-source JavaScript charting library that draws responsive bar, line, pie, radar and scatter charts on an HTML canvas element. It is the most widely used general-purpose chart library on the web and has official wrappers for React, Vue and Angular.
Does Chart.js mean a website was built with AI?+
Chart.js on its own does not prove AI involvement. Standard modern web tooling — its presence alone doesn't indicate AI-assisted development.
Why does Chart.js matter?+
Libraries and third-party services are where a site's real behaviour lives: analytics, payments, auth, UI components and animation all arrive as scripts the browser can see. Knowing that Chart.js is on a page tells you about its dependencies, its privacy footprint, and sometimes its build pipeline — and it helps you tell template-driven stacks from hand-assembled ones. Our detector is scanning the web for Chart.js signals continuously — real examples appear below as they're discovered.
How do we detect Chart.js?+
Our scanner checks for these signals: Script URLs referencing chart.js, chart.umd.js or cdn.jsdelivr.net/npm/chart.js; Canvas elements driven by a global `Chart` constructor in page scripts. Each match contributes to a confidence score, and the full evidence tiers are documented at /how-scores-work.
How many websites using Chart.js are in the database?+
We're still collecting live examples of Chart.js — scan any URL you suspect uses it to add it to the dataset.
What are the typical characteristics of a Chart.js website?+
Canvas-based rendering with eight built-in chart types. Declarative configuration object (data, options, plugins). Responsive resizing and animation out of the box. Wrapper packages such as react-chartjs-2 and vue-chartjs
Related Tools & Technologies
Other libraries and services we detect
Ready to put Chart.js detection to work?
You now know what Chart.js is, why it matters, how to spot it, and where the detection signals come from. The next step is using that knowledge on a real URL — yours, a competitor's, or a prospect's.