How does PageSourceSearch know what learnreact.design 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 learnreact.design 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 learnreact.design?

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 learnreact.design?

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

learnreact.design

Built with gtag, @findify/bundle 7.1.108, lottie-web 5.13.0, @lottiefiles/lottie-player 2.0.12, @feathery/react 2.96.0, @codesandbox/sandpack-client 2.19.8, twitter-widgets, p5 2.3.3, luckysheet 2.1.13, tinycolor2 1.6.0, @alaskaairux/auro-interruption 1.4.5, @oiz/stzh-components 4.16.0 and more. 5 pages and 187 stored files, last crawled 2026-10-03.

rank 1,913,790 25 libraries 1 identifier 96 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
gtag		2026-10-03
@findify/bundle	7.1.108	2026-10-03
lottie-web	5.13.0	2026-10-03
@lottiefiles/lottie-player	2.0.12	2026-10-03
@feathery/react	2.96.0	2026-10-03
@codesandbox/sandpack-client	2.19.8	2026-10-03
twitter-widgets		2026-10-03
p5	2.3.3	2026-10-03
luckysheet	2.1.13	2026-10-03
tinycolor2	1.6.0	2026-10-03
@alaskaairux/auro-interruption	1.4.5	2026-10-03
@oiz/stzh-components	4.16.0	2026-10-03
@pdftron/pdfjs-express-viewer	8.7.5	2026-10-03
@accusoft/pdf-viewer	3.11.158639	2026-10-03
@baloise/ds-core	19.11.0	2026-10-03
@ant-design/x	2.9.0	2026-10-03
@calumk/editorjs-codeflask	1.0.10	2026-10-03
@okta/okta-signin-widget	7.49.1	2026-10-03
@gaia-project/viewer	5.12.0	2026-10-03
peachy-booking-flow	1.11.6	2026-10-03
comindware.core.ui	2.1.149	2026-10-03
veris-storybook-beta	0.1.81-react-upgrade	2026-10-03
machinelearn	2.1.5	2026-10-03
bkl-request-demo	1.0.8	2026-10-03
@solace-health/solace-entry-widget	2.0.5	2026-10-03

Tracking, tag and verification IDs

Public identifiers read out of the source. Each links to every other site in the index that carries the same one.

What	Value	Found in
Universal Analytics property id (Google)	UA-100434258-1	view source

Third-party hosts

Hosts outside learnreact.design 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
airbnb.design	connect	view source
airbnb.io	connect	view source
alistapart.com	connect	view source
api.convertkit.com	connect	view source
app.convertkit.com	connect	view source
app.netlify.com	connect	view source
beebeeye.github.io	connect	view source
blog.framer.com	connect	view source
bradfrost.com	connect	view source
c0yrx.codesandbox.io	connect	view source
calendly.com	connect	view source
cdn.glitch.com	connect	view source
codepen.io	connect	view source
codesandbox.io	connect	view source
coffeescript.org	connect	view source
css-tricks.com	connect	view source
design.tobysilverman.com	connect	view source
dev.to	connect	view source
developer.mozilla.org	connect	view source
disqus.com	connect	view source
dribbble.com	connect	view source
encrypted.google.com	connect	view source
f89r9.csb.app	connect	view source
flexbox.io	connect	view source
fonts.googleapis.com	stylesheet	view source
framer.com	connect	view source
fsgmd.csb.app	connect	view source
gist.github.com	connect	view source
gist.githubusercontent.com	connect	view source
github.com	connect	view source
gtyux.csb.app	connect	view source
hyper.is	connect	view source
image.flaticon.com	connect	view source
item.jd.com	connect	view source
itnews.org	connect	view source
itunes.apple.com	connect	view source
justjavascript.com	connect	view source
learnlayout.com	connect	view source
learnreact-design.firebaseio.com	connect	view source
marketplace.visualstudio.com	connect	view source
material.io	connect	view source
medium.com	connect	view source
medium.freecodecamp.org	connect	view source
mgd7g.csb.app	connect	view source
n52pw.csb.app	connect	view source
nn6qnppo20.codesandbox.io	connect	view source
o9yeu.csb.app	connect	view source
olafurbreidfjord.com	connect	view source
packages.framer.com	connect	view source
pagedraw.io	connect	view source
platform.twitter.com	connect	view source
play.google.com	connect	view source
popmotion.io	connect	view source
principleformac.com	connect	view source
pt866.codesandbox.io	connect	view source
pt866.csb.app	connect	view source
react-spring.surge.sh	connect	view source
reactjs.org	connect	view source
redux.js.org	connect	view source
scrimba.com	connect	view source
setproduct.com	connect	view source
smileyinmotion.com	connect	view source
snack.expo.io	connect	view source
some-api.com	connect	view source
someapi.com	connect	view source
sso.teachable.com	connect	view source
stackoverflow.com	connect	view source
store.framer.com	connect	view source
svg2jsx.com	connect	view source
tachyons.io	connect	view source
tinyfac.es	connect	view source
twitter.com	connect	view source
tylermcginnis.com	connect	view source
usehooks.com	connect	view source
vaska.com	connect	view source
vitals.vercel-insights.com	connect	view source
vrnf3.csb.app	connect	view source
web.archive.org	connect	view source
www.adobe.com	connect	view source
www.benpepin.com	connect	view source
www.designernews.co	connect	view source
www.dropbox.com	connect	view source
www.facebook.com	connect	view source
www.framer.com	connect	view source
www.googletagmanager.com	script	view source
www.invisionapp.com	connect	view source
www.jon.gold	connect	view source
www.npmjs.com	connect	view source
www.producthunt.com	connect	view source
www.sitepoint.com	connect	view source
www.sketchapp.com	connect	view source
www.sketchingwithcss.com	connect	view source
www.w3.org	connect	view source
www.youtube.com	connect	view source
xwu1q.csb.app	connect	view source
zeplin.io	connect	view source

Stored pages and scripts

The newest stored version of each file, newest first@if (p.FilesTruncated) { (the 500 newest of 187) }. 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
https://platform.twitter.com/widgets.js	js library	not fetched	2026-10-03	current
https://www.googletagmanager.com/gtag/js?id=UA-100434258-1	js library	not fetched	2026-10-03	current
https://learnreact.design/_next/static/chunks/71…153cef7.7130d6014fee57b140ce.js	js	66.1 KB	2026-10-03	current
https://learnreact.design/_next/static/chunks/d2…49e0910.255e185a0d48bad0c119.js	js	22.3 KB	2026-10-03	current
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https://learnreact.design/_next/static/chunks/21.29d991e1d464dbd57759.js	js	21 KB	2026-10-03	current
https://learnreact.design/_next/static/chunks/pa…/vue-2f18cfa1577ac357e378.js	js	14.2 KB	2026-10-03	current
https://learnreact.design/_next/static/chunks/pa…-select-1b6c57ba53a9148b5e47.js	js	14.3 KB	2026-10-03	current
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https://learnreact.design/_next/static/chunks/pa…handles-69d5366610ca6efb849a.js	js	13.7 KB	2026-10-03	current
https://learnreact.design/_next/static/chunks/pa…ponents-b83de1fe7b22558b8d49.js	js	14.1 KB	2026-10-03	current
https://learnreact.design/_next/static/chunks/pa…xt-wrap-a6fcbcf7f146a2cc4f88.js	js	13.9 KB	2026-10-03	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.

2026-10-03 first crawl

5 pages, 187 files, 6.9 MB; 25 libraries, 1 identifier, 96 third-party hosts
25 libraries added
- gtag
- luckysheet 2.1.13
- @alaskaairux/auro-interruption 1.4.5
- comindware.core.ui 2.1.149
- @findify/bundle 7.1.108
- @oiz/stzh-components 4.16.0
- @okta/okta-signin-widget 7.49.1
- @accusoft/pdf-viewer 3.11.158639
- @pdftron/pdfjs-express-viewer 8.7.5
- @solace-health/solace-entry-widget 2.0.5
- @lottiefiles/lottie-player 2.0.12
- @baloise/ds-core 19.11.0
- and 13 more
1 identifier added
- UA-100434258-1 Universal Analytics property id
96 third-party hosts added
187 files added

Questions about learnreact.design

How does PageSourceSearch know what learnreact.design 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 learnreact.design 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 learnreact.design?: 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 learnreact.design?: 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.