How does PageSourceSearch know what joshwcomeau.com is built with?

From the site's own source code. The crawler stores the exact bytes of its pages and first-party scripts; the libraries are recognised by fingerprinting that code against known releases, the identifiers are read out of the tag snippets, and the third-party hosts are the script, iframe and stylesheet sources in the HTML and the absolute URLs inside the scripts. Nothing is inferred from headers or guessed.

How far back does the history of joshwcomeau.com go?

To the first crawl the timeline lists. Every crawl records what the site looked like; when a file's content changes, its earlier version stays viewable because the stored chunks are never deleted, only mapped. A crawl that finds a file unchanged adds no copy.

Can I see an older version of a script from joshwcomeau.com?

Yes. In the stored files list, every date under a file opens the version that was live at that crawl, with the same viewer as the current one. The raw bytes can be downloaded from there.

Which other websites use the same tracking IDs as joshwcomeau.com?

Each identifier links to its reverse lookup, the list of every site in the index whose source carries the same id: the sites one analytics property or tag manager container is shared across.

Site profile

joshwcomeau.com

Built with react 17.0.2, react-dom 17.0.2, dashjs 5.2.1, @inkeep/cxkit-js 0.5.119, recaptcha, @reachfive/identity-core 1.42.0, @reachfive/identity-ui 2.1.0, jspdf 4.2.1, phaser 4.2.1, @babel/standalone, matter-js 0.20.0, styled-components 5.3.5 and more. 5 pages and 208 stored files, last crawled 2026-10-02.

rank 390,411 44 libraries 0 identifiers 31 third-party hosts 1 crawl open the site

Technologies and libraries

Recognised by fingerprinting the stored files and bundles against known releases; a version is the release the bytes match.

Library	Version	Seen
react	17.0.2	2026-10-02
react-dom	17.0.2	2026-10-02
dashjs	5.2.1	2026-10-02
@inkeep/cxkit-js	0.5.119	2026-10-02
recaptcha		2026-10-02
@reachfive/identity-core	1.42.0	2026-10-02
@reachfive/identity-ui	2.1.0	2026-10-02
jspdf	4.2.1	2026-10-02
phaser	4.2.1	2026-10-02
@babel/standalone		2026-10-02
matter-js	0.20.0	2026-10-02
styled-components	5.3.5	2026-10-02
fathom		2026-10-02
spectorjs	0.9.33	2026-10-02
bootstrap-italia	2.18.3	2026-10-02
face-age	2.4.6	2026-10-02
videojsadx	4.1.2	2026-10-02
@scalar/api-reference	1.71.0	2026-10-02
@stlite/mountable	0.75.0	2026-10-02
@moveo-ai/web-client	0.117.0	2026-10-02
mammoth	1.12.3	2026-10-02
@tolgee/web	7.2.1	2026-10-02
vue3-sfc-loader	0.9.5	2026-10-02
ovenplayer	0.10.54	2026-10-02
graphql-playground-react	1.7.28	2026-10-02
@recogito/annotorious	2.7.14	2026-10-02
@machi-pla/ai-chatbot	0.1.25	2026-10-02
@mux/videojs-kit	0.12.3	2026-10-02
shiki-es	0.14.0	2026-10-02
@loaders.gl/i3s	4.5.2	2026-10-02
@pierre/diffs	1.5.1	2026-10-02
mori-chat-widget	2.0.49	2026-10-02
@watergis/mapbox-gl-export	4.0.0	2026-10-02
@inkeep/agents-ui-js-cloud	0.17.8	2026-10-02
@joyfill/components	4.0.0-rc26	2026-10-02
@panoramax/web-viewer	5.3.0	2026-10-02
@srgssr/pillarbox-web	1.36.3	2026-10-02
@redvars/peacock	3.9.1	2026-10-02
@pydantic/ai-chat-ui	2.3.0	2026-10-02
@record-evolution/widget-mapbox	1.5.19	2026-10-02
@sendcloud/checkout-plugin-ui	2.4.4	2026-09-24
@zephr/browser	1.9.1	2026-09-24
mapbox-gl	3.31.0	2026-09-24
@betterbugs/web-sdk	0.0.47	2026-09-24

Tracking, tag and verification IDs

No analytics property, tag manager container, pixel or site-verification token was found in the stored source.

Third-party hosts

Hosts outside joshwcomeau.com that its pages load scripts, frames or stylesheets from, and that its own scripts name in absolute URLs (connect). Each links to every site loading from the same host.

Host	Loaded as	Found in
api.codesandbox.io	connect	view source
api.mapbox.com	connect	view source
apps.mapbox.com	connect	view source
blog-v3-party.joshwcomeau.partykit.dev	connect	view source
bsky.app	connect	view source
cdn.skypack.dev	connect	view source
cdn.usefathom.com	connect	view source
codesandbox.io	connect	view source
css-for-js.dev	connect	view source
en.cppreference.com	connect	view source
events.mapbox.cn	connect	view source
events.mapbox.com	connect	view source
example.com	connect	view source
fishshell.com	connect	view source
fonts.googleapis.com	connect	view source
github.com	connect	view source
joyforjs.com	connect	view source
joyofreact.com	connect	view source
nextjs.org	connect	view source
nodebox-runtime.codesandbox.io	connect	view source
npmjs.com	connect	view source
react.dev	connect	view source
stream.mux.com	connect	view source
unpkg.com	connect	view source
use.typekit.net	connect	view source
vercel.live	connect	view source
vjs.zencdn.net	connect	view source
www.joyforjs.com	connect	view source
www.mapbox.com	connect	view source
www.npmjs.com	connect	view source
www.w3.org	connect	view source

Stored pages and scripts

The newest stored version of each file, newest first@if (p.FilesTruncated) { (the 500 newest of 208) }. Versions are the crawls at which the file was new or its content changed; each opens the file as it was then, rebuilt from the same stored chunks.

File	Kind	Size	Collected	Versions
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https://cdn.skypack.dev/[email protected]	js library	not fetched	2026-10-02	current
https://cdn.usefathom.com/script.js	js library	not fetched	2026-10-02	current
https://unpkg.com/@babel/standalone/babel.min.js	js library	not fetched	2026-10-02	current
https://www.google.com/recaptcha/enterprise.js?r…AAAABuxDy1b107GmLy_ANNZjPKrwy87	js library	not fetched	2026-10-02	current
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Timeline

One entry per crawl, newest first, with what changed since the crawl before: libraries, identifiers, third-party hosts and files. Historical versions stay viewable because the stored chunks are shared between versions, never copied.

2026-10-02 first crawl

5 pages, 206 files, 10.3 MB; 40 libraries, 0 identifiers, 31 third-party hosts
40 libraries added
- @inkeep/cxkit-js 0.5.119
- mori-chat-widget 2.0.49
- @machi-pla/ai-chatbot 0.1.25
- @moveo-ai/web-client 0.117.0
- @joyfill/components 4.0.0-rc26
- jspdf 4.2.1
- @reachfive/identity-core 1.42.0
- @reachfive/identity-ui 2.1.0
- ovenplayer 0.10.54
- @recogito/annotorious 2.7.14
- dashjs 5.2.1
- graphql-playground-react 1.7.28
- and 28 more
31 third-party hosts added
- react.dev
- www.w3.org
- nextjs.org
- css-for-js.dev
- joyofreact.com
- blog-v3-party.joshwcomeau.partykit.dev
- cdn.usefathom.com
- bsky.app
- joyforjs.com
- github.com
- vercel.live
- www.npmjs.com
- and 19 more
206 files added

Questions about joshwcomeau.com

How does PageSourceSearch know what joshwcomeau.com is built with?: From the site's own source code. The crawler stores the exact bytes of its pages and first-party scripts; the libraries are recognised by fingerprinting that code against known releases, the identifiers are read out of the tag snippets, and the third-party hosts are the script, iframe and stylesheet sources in the HTML and the absolute URLs inside the scripts. Nothing is inferred from headers or guessed.
How far back does the history of joshwcomeau.com go?: To the first crawl the timeline lists. Every crawl records what the site looked like; when a file's content changes, its earlier version stays viewable because the stored chunks are never deleted, only mapped. A crawl that finds a file unchanged adds no copy.
Can I see an older version of a script from joshwcomeau.com?: Yes. In the stored files list, every date under a file opens the version that was live at that crawl, with the same viewer as the current one. The raw bytes can be downloaded from there.
Which other websites use the same tracking IDs as joshwcomeau.com?: Each identifier links to its reverse lookup, the list of every site in the index whose source carries the same id: the sites one analytics property or tag manager container is shared across.

Look up another site, browse sites by tracking ID, third-party host or technology. Site owners: see the crawler page for how stored pages are removed.