How does PageSourceSearch know what extrasimo.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 extrasimo.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 extrasimo.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 extrasimo.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

extrasimo.cz

Built with gtag, hotjar. 5 pages and 10 stored files, last crawled 2026-10-06.

rank 12,064,847 2 libraries 4 identifiers 6 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		2026-10-06
hotjar		2026-10-06

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-3722054316228988	view source
Google Analytics 4 measurement id (Google)	G-S2D78YJZ4R	view source
Hotjar site id (Hotjar)	3815185	view source
Matomo site id (Matomo)	analytics.incdatagate.cz#3	view source

Third-party hosts

Hosts outside extrasimo.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
cdn.performax.cz	script iframe connect	view source
fonts.googleapis.com	stylesheet	view source
napoveda.sklik.cz	connect	view source
pagead2.googlesyndication.com	script	view source
ssp.seznam.cz	script	view source
www.googletagmanager.com	script	view source

Stored pages and scripts

The newest stored version of each file, newest first@if (p.FilesTruncated) { (the 500 newest of 10) }. 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://extrasimo.cz/js/app.js?v=1788009174771	js	4.4 KB	2026-10-06	2026-10-06
https://www.googletagmanager.com/gtag/js?id=G-S2D78YJZ4R	js library	not fetched	2026-10-06	2026-10-06
https://extrasimo.cz/js/matomo-events.js?v=1788009174771	js	14.6 KB	2026-10-06	2026-10-06
https://extrasimo.cz/js/ads-lazy.js?v=1788009174771	js	4.3 KB	2026-10-06	2026-10-06
https://extrasimo.cz/js/sklik.js?v=1788009174771	js	10.9 KB	2026-10-06	2026-10-06
https://extrasimo.cz/krimi	html	53 KB	2026-10-06	2026-10-06
https://extrasimo.cz/horoskopy	html	53 KB	2026-10-06	2026-10-06
https://extrasimo.cz/celebrity	html	53.3 KB	2026-10-06	2026-10-06
https://extrasimo.cz/zpravy	html	53.4 KB	2026-10-06	2026-10-06
https://extrasimo.cz/	html	69.7 KB	2026-10-06	2026-10-06

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.

2026-10-06 first crawl

5 pages, 10 files, 316.5 KB; 2 libraries, 4 identifiers, 6 third-party hosts
2 libraries added
- gtag
- hotjar
4 identifiers added
- G-S2D78YJZ4R Google Analytics 4 measurement id
- 3815185 Hotjar site id
- ca-pub-3722054316228988 AdSense publisher id
- analytics.incdatagate.cz#3 Matomo site id
8 third-party hosts added
10 files added

Questions about extrasimo.cz

How does PageSourceSearch know what extrasimo.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 extrasimo.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 extrasimo.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 extrasimo.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.