How does PageSourceSearch know what bigfrontend.dev 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 bigfrontend.dev 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 bigfrontend.dev?

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 bigfrontend.dev?

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

bigfrontend.dev

Built with gtm, webpack, chart.js 4.5.1, @findify/bundle 7.1.108, vviinn-widgets 2.224.3, @reachfive/identity-ui 2.1.0, kore-web-sdk 11.28.1, @cognigy/webchat 3.50.0, @codesandbox/sandpack-client 2.19.8, tableexport.jquery.plugin 1.33.0, cloudflare-insights, face-age 2.4.6 and more. 5 pages and 201 stored files, last crawled 2026-10-03.

rank 1,944,045 35 libraries 2 identifiers 26 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
gtm		2026-10-03
webpack		2026-10-03
chart.js	4.5.1	2026-10-03
@findify/bundle	7.1.108	2026-10-03
vviinn-widgets	2.224.3	2026-10-03
@reachfive/identity-ui	2.1.0	2026-10-03
kore-web-sdk	11.28.1	2026-10-03
@cognigy/webchat	3.50.0	2026-10-03
@codesandbox/sandpack-client	2.19.8	2026-10-03
tableexport.jquery.plugin	1.33.0	2026-10-03
cloudflare-insights		2026-10-03
face-age	2.4.6	2026-10-03
@feedmepos/mf-report	5.29.2	2026-10-03
web3	4.16.0	2026-10-03
@aurolabs/auro-back-to-top	1.1.0	2026-10-03
spirhal	4.5.0	2026-10-03
tdesign-react	1.18.3	2026-10-03
@oiz/stzh-components	4.16.0	2026-10-03
@vitest/utils	5.0.2	2026-10-03
filterizr	2.2.4	2026-10-03
docs-searchbar.js	2.5.0	2026-10-03
tdesign-vue-next	1.20.8	2026-10-03
@pdftron/pdfjs-express-viewer	8.7.5	2026-10-03
@memori.ai/memori-webcomponent	8.3.3	2026-10-03
@accusoft/pdf-viewer	3.11.158639	2026-10-03
@widgetti/solara-vuetify-app	10.1.1	2026-10-03
@jspreadsheet/charts	8.0.0	2026-10-03
@anyline/anyline-js	56.1.3	2026-10-03
wonder-image	2.1.2-alpha.4	2026-10-03
@story-telling-reporter/react-embed-code-generator	2.2.20	2026-10-03
comindware.core.ui	2.1.149	2026-10-03
@grigorov-it/mazer	2.2.0	2026-10-03
livewire-sortablejs	0.1.1	2026-10-03
@ignf-geoportal/sdk-2d	3.5.6	2026-10-03
swr	2.5.1	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
AdSense publisher id (Google)	ca-pub-4994361970785668	view source
Google Tag Manager container (Google)	GTM-M8TK4BS	view source

Third-party hosts

Hosts outside bigfrontend.dev 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
bfe.dev	connect	view source
cdn.jsdelivr.net	connect	view source
developer.mozilla.org	connect	view source
discord.com	connect	view source
discord.gg	connect	view source
example.com	connect	view source
fonts.googleapis.com	connect	view source
github.com	connect	view source
jser.pro	connect	view source
m.servedby-buysellads.com	script	view source
platform.twitter.com	connect	view source
r2.bfe.dev	connect	view source
reactjs.org	connect	view source
redis.io	connect	view source
schema.org	connect	view source
shaku-web.vercel.app	connect	view source
static.cloudflareinsights.com	script	view source
twitter.com	connect	view source
use.typekit.net	connect	view source
www.facebook.com	connect	view source
www.greatfrontend.com	connect	view source
www.instagram.com	connect	view source
www.markdownguide.org	connect	view source
www.techinterviewhandbook.org	connect	view source
www.w3.org	connect	view source
www.youtube.com	connect	view source

Stored pages and scripts

The newest stored version of each file, newest first@if (p.FilesTruncated) { (the 500 newest of 201) }. 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://bigfrontend.dev/_next/static/chunks/4125-a8bac19b0ff158cd.js	js	6.6 KB	2026-10-03	current
https://static.cloudflareinsights.com/beacon.min…85bb4c19e7a9bdbcba1788362987495	js library	not fetched	2026-10-03	current
https://bigfrontend.dev/_next/static/chunks/6504-461080ee177cdfbb.js	js	200.3 KB	2026-10-03	current
https://bigfrontend.dev/_next/static/chunks/9094-be71f2bf66ffc9cb.js	js	17.8 KB	2026-10-03	current
https://bigfrontend.dev/_next/static/chunks/117-2a68632a204089c5.js	js	13.8 KB	2026-10-03	current
https://bigfrontend.dev/_next/static/chunks/2301-3da2e7f0b8f7570b.js	js	12.2 KB	2026-10-03	current
https://bigfrontend.dev/_next/static/chunks/7762-222c833f3a0c4947.js	js	9.5 KB	2026-10-03	current
https://bigfrontend.dev/_next/static/chunks/6eb5140f-f9a281104b624e66.js	js	872 B	2026-10-03	current
https://bigfrontend.dev/_next/static/chunks/5837-1d0a5cb146aaa21e.js	js	13.1 KB	2026-10-03	current
https://bigfrontend.dev/_next/static/chunks/8951-0ccb990aa824228e.js	js	14.5 KB	2026-10-03	current
https://bigfrontend.dev/_next/static/chunks/1895-ee8fa23270805dea.js	js	8 KB	2026-10-03	current
https://bigfrontend.dev/_next/static/chunks/3837-15c321956bc8194c.js	js	23.7 KB	2026-10-03	current
https://bigfrontend.dev/_next/static/chunks/8990-220e5cd640db5a59.js	js	8 KB	2026-10-03	current
https://bigfrontend.dev/_next/static/chunks/5312-ef85cd291cad3c9d.js	js	15.9 KB	2026-10-03	current
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https://bigfrontend.dev/_next/static/chunks/2517-5a16c406a28ab96f.js	js	36 KB	2026-10-03	current
https://bigfrontend.dev/_next/static/chunks/5381-6334186384152708.js	js	29.7 KB	2026-10-03	current
https://bigfrontend.dev/_next/static/chunks/4780-3504e78468118dd2.js	js	12.2 KB	2026-10-03	current
https://bigfrontend.dev/_next/static/chunks/019d026b-afd1c30315f61ed0.js	js	732 B	2026-10-03	current
https://bigfrontend.dev/_next/static/chunks/4252-66639c4e39f6d2f3.js	js	12.8 KB	2026-10-03	current
https://bigfrontend.dev/_next/static/chunks/2777-7e19514f2535742e.js	js	861 B	2026-10-03	current
https://bigfrontend.dev/_next/static/chunks/3764-55d637a19a40a421.js	js	13.7 KB	2026-10-03	current
https://bigfrontend.dev/_next/static/chunks/pages/zh-18903a0ae521a040.js	js	18.7 KB	2026-10-03	current
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https://bigfrontend.dev/_next/static/chunks/page…[permalink]-3ded6a1a175c0c70.js	js	17.3 KB	2026-10-03	current
https://bigfrontend.dev/_next/static/chunks/page…/[uid]-c49e0db1f4e4d6b1.js	js	7.1 KB	2026-10-03	current
https://bigfrontend.dev/_next/static/chunks/pages/typescript-841a7709b6438aaa.js	js	8.6 KB	2026-10-03	current
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https://bigfrontend.dev/_next/static/chunks/3868-35c5725ed29b1848.js	js	43.6 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, 201 files, 3.1 MB; 34 libraries, 2 identifiers, 26 third-party hosts
34 libraries added
- gtm
- @vitest/utils 5.0.2
- tableexport.jquery.plugin 1.33.0
- comindware.core.ui 2.1.149
- @findify/bundle 7.1.108
- @aurolabs/auro-back-to-top 1.1.0
- @oiz/stzh-components 4.16.0
- docs-searchbar.js 2.5.0
- @pdftron/pdfjs-express-viewer 8.7.5
- @memori.ai/memori-webcomponent 8.3.3
- @accusoft/pdf-viewer 3.11.158639
- filterizr 2.2.4
- and 22 more
2 identifiers added
- GTM-M8TK4BS Google Tag Manager container
- ca-pub-4994361970785668 AdSense publisher id
26 third-party hosts added
- m.servedby-buysellads.com
- static.cloudflareinsights.com
- reactjs.org
- www.w3.org
- r2.bfe.dev
- discord.gg
- twitter.com
- discord.com
- fonts.googleapis.com
- use.typekit.net
- platform.twitter.com
- bfe.dev
- and 14 more
201 files added

Questions about bigfrontend.dev

How does PageSourceSearch know what bigfrontend.dev 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 bigfrontend.dev 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 bigfrontend.dev?: 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 bigfrontend.dev?: 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.