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  <span style="font-size:12px;font-weight:500;color:#516271;">Independent comparison on Should I Use It</span>
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<a href="https://shouldiuse.io/vs/threejs/d3js">Three.js vs D3 by Observable on Should I Use It</a>

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Three.js versus D3 by Observable
Compare	Three.js	D3 by Observable
Verdict	Worth it	Depends
Best for	Front-end developers building 3D web experiences	Front-end developers building custom viz
Who it's not for	Non-programmers wanting 3D without code	Non-coders wanting charts without JavaScript
Privacy	No known public vulnerabilities found in the sources reviewed.^⁸	No known public vulnerabilities found in the sources reviewed.¹²
Support quality	Community forum and GitHub only	No support evidence in sources
Public sentiment	Developers hail it as a landmark library for web 3D, while acknowledging the learning curve.^⁴	Users call D3 the industry standard for bespoke web visualization but note it is low-level and aging versus vanilla JS.¹⁶
Biggest gotcha	Free library, but the real cost is developer time learning 3D math^⁵	Expect significant developer time before your first polished chart.¹³

Pick Three.js when

Front-end developers building 3D web experiences
Product configurator and data-viz teams
Creative sites needing WebGL or WebGPU
Academic and research visualizations

When Three.js is not a fit

Non-programmers wanting 3D without code
Simple sites that just need one spinning logo
Teams needing vendor support or SLAs
Buyers who want a paid product with a support contract

Pick D3 by Observable when

Front-end developers building custom viz
Data journalism teams
Interactive research dashboards
Teams already using Observable

When D3 by Observable is not a fit

Non-coders wanting charts without JavaScript
Teams needing standard charts fast . use Chart.js
No-code BI dashboard buyers
Projects without developer time for a steep learning curve

Sources

mrdoob/three.js on GitHubgithub.com
official
Three.js official sitethreejs.org
official
Three.js details, reviews, pricingcheckthat.ai
review
r/threejs communityreddit.com
review
Learning difficulty question, Quoraquora.com
review
Three.js alternatives: Babylon.js vs PlayCanvasutsubo.com
news
3D optimization case study, 26MB to 560kbechobind.com
news
Three.js security pagethreejs.org
security
Three.js for WebGL & WebGPUopenapps.pro
official
D3 by Observable . official sited3js.org
official
d3/d3 on GitHubgithub.com
official
D3.js security paged3js.org
security
Introduction to D3.js . D3 in Depthd3indepth.com
review
Alternatives to D3.js . SciChartscichart.com
review
Observable + D3.js . datos.gob.esdatos.gob.es
news
Reddit r/d3js threadreddit.com
review