How does PageSourceSearch know what theory-a.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 theory-a.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 theory-a.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 theory-a.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

theory-a.com

Built with @clerk/ui 1.34.0, @splinetool/runtime 2.0.56, dashjs 5.2.1, @reachfive/identity-core 1.42.0, @reachfive/identity-ui 2.1.0, jspdf 4.2.1, recharts 3.10.1, @cognigy/webchat 3.50.0, universalviewer 4.4.4, threejs-components 0.0.30, mtr-facemesh 7.8.0, @epigraph/ar 2.11.6 and more. 5 pages and 117 stored files, last crawled 2026-10-04.

rank 9,709,791 27 libraries 0 identifiers 53 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
@clerk/ui	1.34.0	2026-10-04
@splinetool/runtime	2.0.56	2026-10-04
dashjs	5.2.1	2026-10-04
@reachfive/identity-core	1.42.0	2026-10-04
@reachfive/identity-ui	2.1.0	2026-10-04
jspdf	4.2.1	2026-10-04
recharts	3.10.1	2026-10-04
@cognigy/webchat	3.50.0	2026-10-04
universalviewer	4.4.4	2026-10-04
threejs-components	0.0.30	2026-10-04
mtr-facemesh	7.8.0	2026-10-04
@epigraph/ar	2.11.6	2026-10-04
ovenplayer	0.10.54	2026-10-04
graphql-playground-react	1.7.28	2026-10-04
chartjs-plugin-crosshair	2.0.0	2026-10-04
@recogito/annotorious	2.7.14	2026-10-04
@tulipnpm/timekit_project_selector	2.1.4	2026-10-04
@memori.ai/memori-webcomponent	8.3.3	2026-10-04
@formio/js	5.6.1	2026-10-04
troika-three-text	0.52.5	2026-10-04
bidi-js	1.1.0	2026-10-04
aframe	1.8.0	2026-10-04
@tsocial/tvweb-sdk	5.38.6	2026-10-04
@crystaldesign/diva-core	26.11.0	2026-10-04
@formbird/angular-elements	8.5.10	2026-10-04
@story-telling-reporter/react-embed-code-generator	2.2.20	2026-10-04
@perceptimagery/sprie-widget	1.3.3015	2026-10-04

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 theory-a.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
21lessons.com	connect	view source
acquirersmultiple.com	connect	view source
api.exchangerate.host	connect	view source
billing.stripe.com	connect	view source
breakingthemarket.com	connect	view source
buy.stripe.com	connect	view source
cdn.jsdelivr.net	connect	view source
cdn.vercel-insights.com	connect	view source
collabfund.com	connect	view source
en.wikipedia.org	connect	view source
fedguy.com	connect	view source
finviz.com	connect	view source
github.com	connect	view source
iexcloud.io	connect	view source
itsjvebrqervtkbdqrcn.supabase.co	connect	view source
m1.com	connect	view source
m1.finance	connect	view source
moontowermeta.com	connect	view source
optionstrat.com	connect	view source
reactjs.org	connect	view source
reddit.com	connect	view source
roic.ai	connect	view source
schema.org	connect	view source
seekingalpha.com	connect	view source
substackcdn.com	connect	view source
taylorpearson.me	connect	view source
theorya.substack.com	iframe connect	view source
twitter.com	connect	view source
venmo.com	connect	view source
vercel.live	connect	view source
vnotes.substack.com	connect	view source
worrydream.com	connect	view source
www.businessinsider.com	connect	view source
www.desmos.com	connect	view source
www.fool.com	connect	view source
www.google.com	connect	view source
www.gstatic.com	connect	view source
www.investopedia.com	connect	view source
www.lazyfa.com	connect	view source
www.lynalden.com	connect	view source
www.morningstar.com	connect	view source
www.nerdwallet.com	connect	view source
www.optionseducation.org	connect	view source
www.reddit.com	connect	view source
www.saashub.com	connect	view source
www.thestreet.com	connect	view source
www.tradingview.com	connect	view source
www.valuesignals.com	connect	view source
www.w3.org	connect	view source
www.wespath.org	connect	view source
www.whatworksonwallstreet.com	connect	view source
www.wsj.com	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 117) }. 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://theory-a.com/about	html	27.7 KB	2026-10-04	2026-10-04
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https://theory-a.com/	html	12.2 KB	2026-10-04	2026-10-04

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.

2026-10-04 first crawl

5 pages, 117 files, 4.4 MB; 27 libraries, 0 identifiers, 53 third-party hosts
27 libraries added
- 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
- @clerk/ui 1.34.0
- @story-telling-reporter/react-embed-code-generator 2.2.20
- @formio/js 5.6.1
- @formbird/angular-elements 8.5.10
- @cognigy/webchat 3.50.0
- and 15 more
54 third-party hosts added
117 files added

Questions about theory-a.com

How does PageSourceSearch know what theory-a.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 theory-a.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 theory-a.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 theory-a.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.