Product Scope Charts

Twenty-four SVG chart types, built from scratch with Claude. No libraries, no dependencies, accessible by default, and written to run under a strict Content-Security-Policy.

See every chart live · Docs · Claude skill · Product Scope

Copy four small files into a project, load them, and call a function with arrays of numbers. Each function returns a DOM node. Every chart has a live demo with the empty and one-point states, a reference page with its options and a complete example. All the data is made up (seeded random numbers generated in the browser), so there is nothing private in here.

Quick start

1. Copy the toolkit. The four files in toolkit/ are all you need: tokens.css, helpers.js, toolkit.css and toolkit.js.

2. Load them in order. They are classic scripts that define globals, not modules.

   <link rel="stylesheet" href="/toolkit/tokens.css">
   <link rel="stylesheet" href="/toolkit/toolkit.css">
   <div id="spend"></div>
   <script src="/toolkit/helpers.js"></script>
   <script src="/toolkit/toolkit.js"></script>
   

3. Draw a chart.

   const host = document.getElementById('spend');
   setChartWidth(host.clientWidth);
   host.replaceChildren(lineChart({
     xs: ['2026-04', '2026-05', '2026-06', '2026-07'],
     xlabel: monthName,
     series: [{ name: 'Spend', values: [1820, 2310, 1960, 2540], colour: 'var(--c1)', area: true }],
     label: 'Monthly spend, April to July 2026'
   }));
   

A complete, working page is in examples/starter/. Serve the repository with any static server (python -m http.server 8200) and open /examples/starter/. The full walk-through is in Getting started.

Use it with Claude

This repository includes a Claude skill so Claude knows how to pick the right chart, add the toolkit to your project and use it properly. In Claude Code:

claude plugin marketplace add DavidLortalPM/productscope-charts
claude plugin install productscope-charts@productscope

Then ask for what you need ("add a dashboard with spend over time and a breakdown by category"). To install the skill by hand, upload it to claude.ai, or just point any assistant at llms-full.txt, see Using it with AI.

The charts

Group	Charts
Over time	Line, stacked area, sparkline, calendar, heatmap, small multiples
Comparing	Grouped bars, ranked bars, waterfall, diverging bars, slope, bump
Spread and relationships	Histogram, box plot, scatter and bubble
Parts of a whole	Stacked, donut, treemap, flow,

There is also a mock-up dashboard that puts ten of them together in one made-up product view.

Why it exists

Most charting libraries want to inject scripts, styles and fonts, which fights a strict Content-Security-Policy, and accessibility tends to arrive as an afterthought. This toolkit is one stylesheet and one script. It draws plain SVG, and keyboard access, screen-reader labels and a colour-blind-checked palette are part of every chart rather than an add-on. It started life inside one of our own apps. We cleaned it up and gave it away as a free resource.

What to expect

• Scripts under a strict policy. No eval, no inline event handlers, no external scripts, fonts or requests. The charts do set style attributes, so the policy needs style-src 'unsafe-inline' or, tighter, style-src 'self'; style-src-attr 'unsafe-inline' (the starter uses the second). Details in Concepts.
• Accessible by default. Keyboard navigation, screen-reader labels, optional patterns instead of colour, and a table view you can offer next to any chart. Eight categorical colours, checked for colour-blind separation; three of the eight are below 3:1 contrast on the light theme, which legends, tooltips and the table view cover. If you find an accessibility problem, please open an issue.
• Honest about edge cases. Empty, one-point, all-zero and outlier data are handled and shown, not hidden.
• Light and dark themes, and charts resize to their container, so they work on a phone.
• Browsers. Written for current evergreen browsers and tested in Chromium. Reports from other browsers are welcome.
• Currency is pounds by default. Change three lines for another currency (see Getting started).

Run this repository

npm install
npm run dev        # http://127.0.0.1:8787, no Cloudflare login needed
npm run check      # consistency checks, generated docs are current, and a smoke test of every page

The site is a single Cloudflare Worker with no bindings and no secrets; the pages are generated on each request, so there is no build output. To deploy your own copy, run npx wrangler deploy against your own Cloudflare account. How the code is organised, and how to add a chart, is in Architecture. Contributions are welcome: see CONTRIBUTING.md.

Made by Product Scope

Product Scope is a product-led consultancy run by David Lortal. We help organisations improve how their systems, teams and processes work together, through product modernisation, automation, integration and AI-assisted delivery.

If you would like charts like these (or the dashboards and reporting around them) in your own product, or want to talk about something bigger, get in touch. You can also read how we work in the articles.

Licence

MIT. See LICENSE. © 2026 David Lortal / Product Scope Ltd. Fonts are under the SIL Open Font License (see src/fonts/README.md). See the changelog for what has changed.