How does PageSourceSearch know what kalkulator.cz 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 kalkulator.cz 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 kalkulator.cz?

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 kalkulator.cz?

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

kalkulator.cz

Built with gtm, @clerk/ui 1.34.0, dashjs 5.2.1, @reachfive/identity-core 1.42.0, @reachfive/identity-ui 2.1.0, jspdf 4.2.1, @cognigy/webchat 3.50.0, spectorjs 0.9.33, universalviewer 4.4.4, @moveo-ai/web-client 0.117.0, spirhal 4.5.0, fusioncharts 4.2.2 and more. 5 pages and 201 stored files, last crawled 2026-10-04.

rank 9,791,469 20 libraries 2 identifiers 30 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		2026-10-04
@clerk/ui	1.34.0	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
@cognigy/webchat	3.50.0	2026-10-04
spectorjs	0.9.33	2026-10-04
universalviewer	4.4.4	2026-10-04
@moveo-ai/web-client	0.117.0	2026-10-04
spirhal	4.5.0	2026-10-04
fusioncharts	4.2.2	2026-10-04
ovenplayer	0.10.54	2026-10-04
graphql-playground-react	1.7.28	2026-10-04
@recogito/annotorious	2.7.14	2026-10-04
@machi-pla/ai-chatbot	0.1.25	2026-10-04
@ant-design/x	2.9.0	2026-10-04
mori-chat-widget	2.0.49	2026-10-04
@inkeep/agents-ui-js-cloud	0.17.8	2026-10-04
@joyfill/components	4.0.0-rc26	2026-10-04

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
Facebook app id (Meta)	2220391788200892	view source
Sentry DSN host (Sentry)	sentry-relay.uxf.cz	view source

Third-party hosts

Hosts outside kalkulator.cz 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
addons.mozilla.org	connect	view source
base-ui.com	connect	view source
c.imedia.cz	connect	view source
chrome.google.com	connect	view source
connect.facebook.net	connect	view source
dogs.are.great	connect	view source
example.com	connect	view source
github.com	connect	view source
grwapi.net	connect	view source
images.pexels.com	connect	view source
interfaces.zapier.com	connect	view source
noembed.com	connect	view source
opentopo.app	connect	view source
purecatamphetamine.github.io	connect	view source
react.dev	connect	view source
schema.org	connect	view source
speedtest.cesnet.cz	connect	view source
uxf.cz	connect	view source
widget.setricelecesko.cz	connect	view source
widget.setricelecesko.uxf.dev	connect	view source
www.example.com	connect	view source
www.facebook.com	connect	view source
www.firmy.cz	connect	view source
www.google-analytics.com	connect	view source
www.googletagmanager.com	iframe connect	view source
www.instagram.com	connect	view source
www.linkedin.com	connect	view source
www.sitemaps.org	connect	view source
www.uxf.cz	connect	view source
www.w3.org	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
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https://www.kalkulator.cz/_next/static/chunks/1693-68b3726d816be06c.js	js	8.7 KB	2026-10-04	2026-10-04
https://www.kalkulator.cz/_next/static/chunks/4162-56673413e7796e6b.js	js	17.3 KB	2026-10-04	2026-10-04
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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.

2026-10-04 first crawl

5 pages, 201 files, 8.3 MB; 20 libraries, 2 identifiers, 30 third-party hosts
20 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
- @inkeep/agents-ui-js-cloud 0.17.8
- mori-chat-widget 2.0.49
- universalviewer 4.4.4
- @ant-design/x 2.9.0
- @joyfill/components 4.0.0-rc26
- and 8 more
2 identifiers added
- 2220391788200892 Facebook app id
- sentry-relay.uxf.cz Sentry DSN host
31 third-party hosts added
- www.googletagmanager.com
- github.com
- react.dev
- www.w3.org
- chrome.google.com
- addons.mozilla.org
- www.uxf.cz
- www.googletagmanager.com
- www.facebook.com
- www.instagram.com
- www.linkedin.com
- www.sitemaps.org
- and 19 more
201 files added

Questions about kalkulator.cz

How does PageSourceSearch know what kalkulator.cz 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 kalkulator.cz 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 kalkulator.cz?: 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 kalkulator.cz?: 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.