Chart.js (MIT, free) and Highcharts (free non-commercial, ~$590+ commercial) — higher-level charting layer

Summary

Claim: Chart.js is MIT-licensed and free. Highcharts is free for non-commercial use, with commercial licenses starting at ~$590+. Both sit on top of the D3-era visualization ecosystem.

Source: Library project pages.

Confidence: Verified.

Why this matters for Candid: For SMB-scale dashboards, Chart.js covers 80% of needs at zero cost; Highcharts buys polish at a still-small line item. The relevant point is that neither is bespoke.