How does PageSourceSearch know what techinterviewhandbook.org 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 techinterviewhandbook.org 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 techinterviewhandbook.org?

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 techinterviewhandbook.org?

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

techinterviewhandbook.org

Built with gtag, instantsearch.js 4.118.0, algoliasearch.zendesk-hc 3.0.0, tinymce 8.9.2, swagger-ui-dist 5.33.0, @inkeep/cxkit-js 0.5.119, @feathery/react 2.96.0, @reachfive/identity-ui 2.1.0, @cognigy/webchat 3.50.0, twitter-widgets, cloudflare-insights, cloudflare-email-decode and more. 5 pages and 143 stored files, last crawled 2026-10-03.

rank 1,830,883 22 libraries 3 identifiers 146 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
instantsearch.js	4.118.0	2026-10-03
algoliasearch.zendesk-hc	3.0.0	2026-10-03
tinymce	8.9.2	2026-10-03
swagger-ui-dist	5.33.0	2026-10-03
@inkeep/cxkit-js	0.5.119	2026-10-03
@feathery/react	2.96.0	2026-10-03
@reachfive/identity-ui	2.1.0	2026-10-03
@cognigy/webchat	3.50.0	2026-10-03
twitter-widgets		2026-10-03
cloudflare-insights		2026-10-03
cloudflare-email-decode		2026-10-03
@revenuecat/purchases-js-hybrid-mappings	19.3.1	2026-10-03
@vitest/utils	5.0.2	2026-10-03
scanbot-web-sdk	9.0.0	2026-10-03
@collectionspace/cspace-public-browser	4.0.0	2026-10-03
@ant-design/x	2.9.0	2026-10-03
@chainlink/cl-search-frontend	0.13.2	2026-10-03
@wix/image	1.454.0	2026-10-03
tdesign-react	1.18.3	2026-09-25
graphql-playground-react	1.7.28	2026-09-25
react-grid-layout	2.2.4	2026-09-25

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
Cloudflare Web Analytics token (Cloudflare)	5d5da8d7b00f470db01eaa28f365d90b	view source
Google Analytics 4 measurement id (Google)	G-9F86L298EX	view source
Universal Analytics property id (Google)	UA-44622716-2	view source

Third-party hosts

Hosts outside techinterviewhandbook.org 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
16x.engineer	connect	view source
about.fb.com	connect	view source
addyo.substack.com	connect	view source
algo.monster	connect	view source
avatars.githubusercontent.com	connect	view source
avatars1.githubusercontent.com	connect	view source
ayehigh.com	connect	view source
blog.dataengineer.io	connect	view source
blog.isquaredsoftware.com	connect	view source
blog.pragmaticengineer.com	connect	view source
bytebytego.com	connect	view source
careerkarma.com	connect	view source
cdn.jsdelivr.net	connect	view source
codepen.io	connect	view source
coderpad.io	connect	view source
dev.to	connect	view source
developer.mozilla.org	connect	view source
developers.soundcloud.com	connect	view source
discord.com	connect	view source
docs.google.com	connect	view source
docs.oracle.com	connect	view source
docs.python.org	connect	view source
docusaurus.io	connect	view source
dropbox.github.io	connect	view source
en.cppreference.com	connect	view source
en.wikipedia.org	connect	view source
fellowship.mlh.io	connect	view source
flow.org	connect	view source
flutter.dev	connect	view source
fxo.co	connect	view source
ghbtns.com	iframe connect	view source
gist.github.com	connect	view source
github.com	connect	view source
graphql.org	connect	view source
haseebq.com	connect	view source
iio.sh	connect	view source
interviewing.io	connect	view source
jestjs.io	connect	view source
jobs.netflix.com	connect	view source
jvns.ca	connect	view source
kentcdodds.com	connect	view source
kinobi.tech	connect	view source
learn.microsoft.com	connect	view source
learninpublic.org	connect	view source
leetcode.com	connect	view source
levelupsoftwareengineering.substack.com	connect	view source
lik.ai	connect	view source
linkedin.com	connect	view source
medium.com	connect	view source
news.ycombinator.com	connect	view source
newsletter.pragmaticengineer.com	connect	view source
newsletter.systemdesign.one	connect	view source
newsletter.techleadmentor.com	connect	view source
nusmods.com	connect	view source
ocs.yale.edu	connect	view source
pbs.twimg.com	connect	view source
pconrad.github.io	connect	view source
platform.twitter.com	connect	view source
progression.fyi	connect	view source
reactjs.org	connect	view source
reactnative.dev	connect	view source
read.engineerscodex.com	connect	view source
read.highgrowthengineer.com	connect	view source
refactoring.fm	connect	view source
relay.dev	connect	view source
remoterocketship.com	connect	view source
repl.it	connect	view source
resumeworded.com	connect	view source
roadmap.sh	connect	view source
samuelalbanie.com	connect	view source
schema.org	connect	view source
secure.oculus.com	connect	view source
shareasale.com	connect	view source
silentmatt.com	connect	view source
stackoverflow.com	connect	view source
staffeng.com	connect	view source
static.cloudflareinsights.com	script	view source
store.facebook.com	connect	view source
strategizeyourcareer.com	connect	view source
techcrunch.com	connect	view source
thebehavioral.substack.com	connect	view source
thebehavioral.tech	connect	view source
twitter.com	connect	view source
upload.wikimedia.org	connect	view source
user-images.githubusercontent.com	connect	view source
users.cs.utah.edu	connect	view source
vulcanpost.com	connect	view source
webplatform.github.io	connect	view source
workplace.com	connect	view source
www.algolia.com	connect	view source
www.amazon.com	connect	view source
www.brendangregg.com	connect	view source
www.comparably.com	connect	view source
www.coursera.org	connect	view source
www.craftinginterpreters.com	connect	view source
www.cs.yale.edu	connect	view source
www.designgurus.io	connect	view source
www.developing.dev	connect	view source
www.educative.io	connect	view source
www.faangtechleads.com	connect	view source
www.facebook.com	connect	view source
www.freecodecamp.org	connect	view source
www.frontendinterviewhandbook.com	connect	view source
www.github.com	connect	view source
www.glassdoor.com	connect	view source
www.glassdoor.sg	connect	view source
www.goodreads.com	connect	view source
www.googletagmanager.com	script	view source
www.greatfrontend.com	connect	view source
www.guru99.com	connect	view source
www.hackerrank.com	connect	view source
www.hellointerview.com	connect	view source
www.hungryminds.dev	connect	view source
www.joelonsoftware.com	connect	view source
www.jointaro.com	connect	view source
www.khanacademy.org	connect	view source
www.levels.fyi	connect	view source
www.linkedin.com	connect	view source
www.manning.com	connect	view source
www.metacareers.com	connect	view source
www.moe.gov.sg	connect	view source
www.oculus.com	connect	view source
www.omarhalabieh.com	connect	view source
www.online-utility.org	connect	view source
www.quora.com	connect	view source
www.reuters.com	connect	view source
www.roadtovr.com	connect	view source
www.saiyangrowthletter.com	connect	view source
www.sciencedirect.com	connect	view source
www.swyx.io	connect	view source
www.systemdesignhandbook.com	connect	view source
www.tanayj.com	connect	view source
www.teamblind.com	connect	view source
www.teamrora.com	connect	view source
www.thecaringtechie.com	connect	view source
www.theinformation.com	connect	view source
www.theverge.com	connect	view source
www.toptal.com	connect	view source
www.tryexponent.com	connect	view source
www.tutorialspoint.com	connect	view source
www.udemy.com	connect	view source
www.w3.org	connect	view source
www.wild-inter.net	connect	view source
www.yangshuntay.com	connect	view source
www.youtube.com	connect	view source
www.zhenghao.io	connect	view source

Stored pages and scripts

The newest stored version of each file, newest first@if (p.FilesTruncated) { (the 500 newest of 143) }. 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://static.cloudflareinsights.com/beacon.min.js	js library	not fetched	2026-10-03	current
https://www.googletagmanager.com/gtag/js?id=G-9F86L298EX	js library	not fetched	2026-10-03	current
https://www.googletagmanager.com/gtag/js?id=UA-44622716-2	js library	not fetched	2026-10-03	current
https://www.techinterviewhandbook.org/assets/js/9568.122ac735.js	js	175 B	2026-10-03	current
https://www.techinterviewhandbook.org/assets/js/6932.606c593e.js	js	10.1 KB	2026-10-03	current
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https://www.techinterviewhandbook.org/assets/js/4bcead45.d1991421.js	js	15.8 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, 143 files, 2.4 MB; 19 libraries, 3 identifiers, 146 third-party hosts
19 libraries added
- gtag
- cloudflare-email-decode
- @vitest/utils 5.0.2
- cloudflare-insights
- @revenuecat/purchases-js-hybrid-mappings 19.3.1
- algoliasearch.zendesk-hc 3.0.0
- @collectionspace/cspace-public-browser 4.0.0
- tinymce 8.9.2
- @ant-design/x 2.9.0
- @chainlink/cl-search-frontend 0.13.2
- @inkeep/cxkit-js 0.5.119
- @wix/image 1.454.0
- and 7 more
3 identifiers added
- G-9F86L298EX Google Analytics 4 measurement id
- UA-44622716-2 Universal Analytics property id
- 5d5da8d7b00f470db01eaa28f365d90b Cloudflare Web Analytics token
147 third-party hosts added
143 files added

Questions about techinterviewhandbook.org

How does PageSourceSearch know what techinterviewhandbook.org 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 techinterviewhandbook.org 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 techinterviewhandbook.org?: 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 techinterviewhandbook.org?: 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.