How does PageSourceSearch know what usaco.guide 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 usaco.guide 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 usaco.guide?

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 usaco.guide?

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

usaco.guide

Built with gtm, @clerk/ui 1.34.0, firebase 12.19.0, dashjs 5.2.1, @marimo-team/frontend 0.25.0, @inkeep/cxkit-js 0.5.119, @feathery/react 2.96.0, recaptcha, @reachfive/identity-core 1.42.0, @reachfive/identity-ui 2.1.0, jspdf 4.2.1, google-apis and more. 5 pages and 135 stored files, last crawled 2026-10-03.

rank 1,923,532 44 libraries 0 identifiers 85 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
@clerk/ui	1.34.0	2026-10-03
firebase	12.19.0	2026-10-03
dashjs	5.2.1	2026-10-03
@marimo-team/frontend	0.25.0	2026-10-03
@inkeep/cxkit-js	0.5.119	2026-10-03
@feathery/react	2.96.0	2026-10-03
recaptcha		2026-10-03
@reachfive/identity-core	1.42.0	2026-10-03
@reachfive/identity-ui	2.1.0	2026-10-03
jspdf	4.2.1	2026-10-03
google-apis		2026-10-03
paulirish/lite-youtube-embed		2026-10-03
cloudflare-insights		2026-10-03
p5	2.3.3	2026-10-03
simplemde	1.11.2	2026-10-03
cloudflare-email-decode		2026-10-03
easymde	2.21.0	2026-10-03
spectorjs	0.9.33	2026-10-03
@mermaid-js/layout-elk	1.0.0	2026-10-03
@moveo-ai/web-client	0.119.0	2026-10-03
@elevenlabs/convai-widget-embed	0.18.2	2026-10-03
volantis-static	0.0.1761982841160	2026-10-03
ovenplayer	0.10.54	2026-10-03
graphql-playground-react	1.7.28	2026-10-03
@recogito/annotorious	2.7.14	2026-10-03
@machi-pla/ai-chatbot	0.1.25	2026-10-03
umd-react	19.3.0	2026-10-03
replaywebpage	2.5.3	2026-10-03
@crystaldesign/diva-web-planner-react	26.11.0	2026-10-03
@ant-design/x	2.9.0	2026-10-03
@widgetti/solara-vuetify-app	10.1.1	2026-10-03
mori-chat-widget	2.0.49	2026-10-03
@stytch/vanilla-js	6.3.0	2026-10-03
cobrowse-sdk-js	3.28.7	2026-10-03
@waniwani/sdk	0.21.3	2026-10-03
@formbird/angular-elements	8.5.10	2026-10-03
@joyfill/components	4.0.0-rc26	2026-10-03
prometix	1.7.0	2026-10-03
@unbabel/ui	5.19.0	2026-10-03
@chainlink/cl-search-frontend	0.13.2	2026-10-03
@limetech/lime-elements	40.5.1	2026-10-03
ace-linters	2.2.1	2026-10-03
instantsearch.js	4.118.0	2026-09-25

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 usaco.guide 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
advaybajpai.me	connect	view source
analytics.google.com	connect	view source
andiqu.com	connect	view source
aops.com	connect	view source
api.github.com	connect	view source
apis.google.com	connect	view source
atcoder.jp	connect	view source
cdn.jsdelivr.net	connect	view source
codeforces.com	connect	view source
computercrafter.netlify.app	connect	view source
cp-algorithms.com	connect	view source
creativecommons.org	connect	view source
csacademy.com	connect	view source
cses.fi	connect	view source
darrenyao.com	connect	view source
denialriver1434.github.io	connect	view source
developers.google.com	connect	view source
dmoj.ca	connect	view source
docs.google.com	connect	view source
easyfuncoding.com	connect	view source
en.cppreference.com	connect	view source
gcc.gnu.org	connect	view source
ggzk2rm2ad.execute-api.us-west-1.amazonaws.com	connect	view source
github.com	connect	view source
github.test	connect	view source
hackerearth.com	connect	view source
harrycodes.com	connect	view source
html.spec.whatwg.org	connect	view source
jasonaa.me	connect	view source
jeffkmeng.com	connect	view source
joincpi.org	connect	view source
json-schema.org	connect	view source
judge.yosupo.jp	connect	view source
juheonrhee.com	connect	view source
leetcode.com	connect	view source
link.springer.com	connect	view source
maggieliu.dev	connect	view source
maxcdn.bootstrapcdn.com	connect	view source
melodyyu.com	connect	view source
nathanchen.me	connect	view source
non-trivial.org	connect	view source
nwatx.me	connect	view source
open.kattis.com	connect	view source
qoj.ac	connect	view source
raw.githubusercontent.com	connect	view source
react.dev	connect	view source
reddit.com	connect	view source
robocontest.uz	connect	view source
schema.org	connect	view source
securetoken.google.com	connect	view source
sendtoaryansh.gitbook.io	connect	view source
stackoverflow.com	connect	view source
static.cloudflareinsights.com	script	view source
szhao.dev	connect	view source
szkopul.edu.pl	connect	view source
thecodingwizard.me	connect	view source
thepuzzlr.com	connect	view source
tlx.toki.id	connect	view source
uploads.github.com	connect	view source
usaco-guide.firebaseio.com	connect	view source
usaco.org	connect	view source
vercel.live	connect	view source
www.algolia.com	connect	view source
www.codechef.com	connect	view source
www.cplusplus.com	connect	view source
www.facebook.com	connect	view source
www.geeksforgeeks.org	connect	view source
www.google.com	connect	view source
www.googletagmanager.com	connect	view source
www.hackerrank.com	connect	view source
www.ibm.com	connect	view source
www.khanacademy.org	connect	view source
www.learncpp.com	connect	view source
www.linkedin.com	connect	view source
www.markdownguide.org	connect	view source
www.nikitago.xyz	connect	view source
www.paypal.com	connect	view source
www.ryanchou.dev	connect	view source
www.spoj.com	connect	view source
www.topcoder.com	connect	view source
www.usaco.org	connect	view source
www.w3.org	connect	view source
www.youtube.com	connect	view source
youtu.be	connect	view source
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 135) }. 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://static.cloudflareinsights.com/beacon.min…85bb4c19e7a9bdbcba1788362987495	js library	not fetched	2026-10-03	current
https://www.google.com/recaptcha/api.js	js library	not fetched	2026-10-03	current
https://www.google.com/recaptcha/enterprise.js?render=	js library	not fetched	2026-10-03	current
https://www.googletagmanager.com/gtm.js	js library	not fetched	2026-10-03	current
https://usaco.guide/_next/static/chunks/9780.3128977e9ca710d0.js	js	150.9 KB	2026-10-03	current
https://usaco.guide/_next/static/chunks/9638.d598b16b2f585d03.js	js	11.1 KB	2026-10-03	current
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https://usaco.guide/bronze	html	71.2 KB	2026-10-03	2026-10-03
https://usaco.guide/general	html	75.1 KB	2026-10-03	2026-10-03
https://usaco.guide/problems	html	54.8 KB	2026-10-03	2026-10-03
https://usaco.guide/dashboard	html	221.2 KB	2026-10-03	2026-10-03
https://usaco.guide/	html	361.8 KB	2026-10-03	2026-10-03
https://usaco.guide/_next/static/chunks/9079.4e29f85ea8fade05.js	js	215 B	2026-09-25	current
https://usaco.guide/_next/static/chunks/6827.a0d777a8d46422ce.js	js	102.3 KB	2026-09-25	current
https://usaco.guide/_next/static/chunks/4393.b4cdc02307a244cc.js	js	6.5 KB	2026-09-25	current
https://usaco.guide/_next/static/chunks/1431.3ef3dd9563bb3aac.js	js	1.2 KB	2026-09-25	current
https://usaco.guide/_next/static/chunks/6641-21a66aca58127ca1.js	js	12.6 KB	2026-09-25	current
https://usaco.guide/_next/static/chunks/5428-e88eaaa15cf30e2d.js	js	9.1 KB	2026-09-25	current
https://usaco.guide/_next/static/chunks/9564-be6cd6390bfcd719.js	js	27.6 KB	2026-09-25	current
https://usaco.guide/_next/static/chunks/9993-525d10e4ca9734d5.js	js	70.9 KB	2026-09-25	current
https://usaco.guide/_next/static/chunks/483-64725248133cda04.js	js	2.9 KB	2026-09-25	current
https://usaco.guide/_next/static/chunks/pages/gr…[problemId]-590e1faf29706588.js	js	16.8 KB	2026-09-25	current
https://usaco.guide/_next/static/chunks/pages/gr…/[postId]-e090b621eb6aae5e.js	js	12.5 KB	2026-09-25	current
https://usaco.guide/_next/static/chunks/8232-0e19a52db8f2aa93.js	js	182.3 KB	2026-09-25	current
https://usaco.guide/_next/static/vZdxgg2gp9VfXRQWQ2U3L/_ssgManifest.js	js	265 B	2026-09-25	current
https://usaco.guide/_next/static/vZdxgg2gp9VfXRQWQ2U3L/_buildManifest.js	js	5 KB	2026-09-25	current
https://usaco.guide/_next/static/chunks/4587-3868a77e86701cc5.js	js	11.1 KB	2026-09-25	current
https://usaco.guide/_next/static/chunks/main-846ea4b5bff94efe.js	js	136.2 KB	2026-09-25	current
https://usaco.guide/_next/static/chunks/webpack-e7da51e1805e1b4c.js	js	5.4 KB	2026-09-25	current

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, 118 files, 5.7 MB; 43 libraries, 0 identifiers, 85 third-party hosts
43 libraries added
- cloudflare-email-decode
- 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
- @machi-pla/ai-chatbot 0.1.25
- mori-chat-widget 2.0.49
- @inkeep/cxkit-js 0.5.119
- spectorjs 0.9.33
- and 31 more
85 third-party hosts added
118 files added

Questions about usaco.guide

How does PageSourceSearch know what usaco.guide 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 usaco.guide 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 usaco.guide?: 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 usaco.guide?: 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.