How does PageSourceSearch know what serlo.org 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 serlo.org 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 serlo.org?

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 serlo.org?

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

serlo.org

Built with gtm, katex 0.18.9, @clerk/ui 1.34.0, dashjs 5.2.1, vviinn-widgets 2.224.3, @reachfive/identity-core 1.42.0, @reachfive/identity-ui 2.1.0, jspdf 4.2.1, sa-sdk-javascript 1.27.14, kore-web-sdk 11.28.1, @cognigy/webchat 3.50.0, paulirish/lite-youtube-embed and more. 5 pages and 205 stored files, last crawled 2026-10-02.

rank 416,048 36 libraries 0 identifiers 66 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		2026-10-02
katex	0.18.9	2026-10-02
@clerk/ui	1.34.0	2026-10-02
dashjs	5.2.1	2026-10-02
vviinn-widgets	2.224.3	2026-10-02
@reachfive/identity-core	1.42.0	2026-10-02
@reachfive/identity-ui	2.1.0	2026-10-02
jspdf	4.2.1	2026-10-02
sa-sdk-javascript	1.27.14	2026-10-02
kore-web-sdk	11.28.1	2026-10-02
@cognigy/webchat	3.50.0	2026-10-02
paulirish/lite-youtube-embed		2026-10-02
socket.io	0.22.0	2026-10-02
@widgetbot/crate	3.9.1	2026-10-02
@adalong/widget	7.15.1	2026-10-02
@stlite/mountable	0.75.0	2026-10-02
ovenplayer	0.10.54	2026-10-02
graphql-playground-react	1.7.28	2026-10-02
parse	8.6.2	2026-10-02
@recogito/annotorious	2.7.14	2026-10-02
@sledge-app/js	2.0.114	2026-10-02
h5p-standalone	3.8.2	2026-10-02
wsemi	1.9.3	2026-10-02
grapesjs	0.23.6	2026-10-02
@apollographql/graphql-playground-react	1.7.42	2026-10-02
@widgetti/solara-vuetify-app	10.1.1	2026-10-02
@stytch/vanilla-js	6.3.0	2026-10-02
@okta/okta-signin-widget	7.49.1	2026-10-02
@formbird/angular-elements	8.5.10	2026-10-02
@yookgmbh/storefront-components	1.3.12	2026-10-02
@limetech/lime-elements	40.5.1	2026-10-02
@jimmyswrld/j-calc	2.0.0	2026-10-02
@solace-health/solace-entry-widget	2.0.5	2026-10-02
mdbootstrap	4.20.0	2026-09-24
easymde	2.21.0	2026-09-24
nerdamer	1.1.13	2026-09-24

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 serlo.org 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
123mathe.de	connect	view source
aai.demo.meinbildungsraum.de	connect	view source
aai.vidis.schule	connect	view source
aba-aufgaben.nibis.de	connect	view source
analytics.google.com	connect	view source
api.console.ory.sh	connect	view source
app.lumi.education	connect	view source
bildungsserver.berlin-brandenburg.de	connect	view source
cdn.jsdelivr.net	connect	view source
cdn.pixabay.com	connect	view source
chancenwerk.de	connect	view source
creativecommons.org	connect	view source
cse.google.com	connect	view source
de.serlo-staging.dev	connect	view source
developers.google.com	connect	view source
dini-ag-kim.github.io	connect	view source
discord.com	connect	view source
docs.google.com	connect	view source
docs.simpleanalytics.com	connect	view source
drive.google.com	connect	view source
editor.serlo-staging.dev	connect	view source
editor.serlo.dev	connect	view source
example.com	connect	view source
f.vimeocdn.com	connect	view source
fontawesome.com	connect	view source
fonts.googleapis.com	connect	view source
fonts.gstatic.com	connect	view source
forms.gle	connect	view source
fresnel.vimeocdn.com	connect	view source
frontend-git-2321-prototyping-dashboard-serlo.vercel.app	connect	view source
github.com	connect	view source
googleads.g.doubleclick.net	connect	view source
h5p.org	connect	view source
i.vimeocdn.com	connect	view source
i.ytimg.com	connect	view source
mnweg.org	connect	view source
pixabay.com	connect	view source
player.vimeo.com	connect	view source
playground.projects.oryapis.com	connect	view source
purl.org	connect	view source
reactjs.org	connect	view source
schema.org	connect	view source
serlo.github.io	connect	view source
serlo.jobs.personio.de	connect	view source
serlo.slack.com	connect	view source
serlo.us7.list-manage.com	connect	view source
static.doubleclick.net	connect	view source
use.typekit.net	connect	view source
vimeo.com	connect	view source
wirlernenonline.de	connect	view source
www.bycs.de	connect	view source
www.chancencampus.org	connect	view source
www.example.com	connect	view source
www.facebook.com	connect	view source
www.geogebra.org	connect	view source
www.google.com	connect	view source
www.googletagmanager.com	connect	view source
www.gstatic.com	connect	view source
www.meinbildungsraum.de	connect	view source
www.raschweb.de	connect	view source
www.schule-bw.de	connect	view source
www.strobl-f.de	connect	view source
www.w3.org	connect	view source
www.youtube-nocookie.com	connect	view source
www.youtube.com	connect	view source
za.schleswig-holstein.de	connect	view source

Stored pages and scripts

The newest stored version of each file, newest first@if (p.FilesTruncated) { (the 500 newest of 205) }. 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://cdn.jsdelivr.net/gh/paulirish/lite-youtu…/src/lite-yt-embed.js	js library	not fetched	2026-10-02	current
https://de.serlo.org/_next/static/chunks/5070.2b5bea7ae06c100d.js	js	3 KB	2026-10-02	current
https://www.googletagmanager.com/gtm.js	js library	not fetched	2026-10-02	current
https://de.serlo.org/_next/static/chunks/4852.43822c6cf44cf0ef.js	js	11.8 KB	2026-10-02	current
https://de.serlo.org/_next/static/chunks/5043.8858322b02830637.js	js	2.7 KB	2026-10-02	current
https://de.serlo.org/_next/static/chunks/4702.5ae7572408f4d236.js	js	709.7 KB	2026-10-02	current
https://de.serlo.org/_next/static/chunks/4774.7e8135a4dae79a34.js	js	2.9 KB	2026-10-02	current
https://de.serlo.org/_next/static/chunks/4653.e60e8cf8dcc3462e.js	js	773 B	2026-10-02	current
https://de.serlo.org/_next/static/chunks/4588.c4128ccd8c80fd2f.js	js	5.4 KB	2026-10-02	current
https://de.serlo.org/_next/static/chunks/4566.f70c735e8d5b4148.js	js	2.2 KB	2026-10-02	current
https://de.serlo.org/_next/static/chunks/4376.f9a64aceb0d9e15b.js	js	2.2 KB	2026-10-02	current
https://de.serlo.org/_next/static/chunks/4186.9636d0d258c04078.js	js	8.3 KB	2026-10-02	current
https://de.serlo.org/_next/static/chunks/3701.2ba3472712b1e0b5.js	js	280 KB	2026-10-02	current
https://de.serlo.org/_next/static/chunks/4008.92b372f500465ebf.js	js	4.2 KB	2026-10-02	current
https://de.serlo.org/_next/static/chunks/3629.fa22c8250deb0447.js	js	8.9 KB	2026-10-02	current
https://de.serlo.org/_next/static/chunks/3612.c6287a71f658bb4e.js	js	9.5 KB	2026-10-02	current
https://de.serlo.org/_next/static/chunks/3192.605c181a9e457d43.js	js	9.1 KB	2026-10-02	current
https://de.serlo.org/_next/static/chunks/3159.17161c6381dcb107.js	js	3.1 KB	2026-10-02	current
https://de.serlo.org/_next/static/chunks/3116.a21306bd744696ec.js	js	20.8 KB	2026-10-02	current
https://de.serlo.org/_next/static/chunks/2845.917e9ff3ec35b4d7.js	js	20.8 KB	2026-10-02	current
https://de.serlo.org/_next/static/chunks/2838.2e237c000c3212ee.js	js	9 KB	2026-10-02	current
https://de.serlo.org/_next/static/chunks/2699.9c74edcc7e62e314.js	js	1.8 KB	2026-10-02	current
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https://de.serlo.org/_next/static/chunks/2529.3fa2d215d51a24a6.js	js	681 B	2026-10-02	current
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https://de.serlo.org/_next/static/chunks/1525.c339cc4616839c3c.js	js	3.4 KB	2026-10-02	current
https://de.serlo.org/_next/static/chunks/1509.01b3ce1659aee254.js	js	9 KB	2026-10-02	current
https://de.serlo.org/_next/static/chunks/1363.de120b6efd6be04b.js	js	23.5 KB	2026-10-02	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.

2026-10-02 first crawl

5 pages, 202 files, 6.1 MB; 33 libraries, 0 identifiers, 66 third-party hosts
33 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
- @cognigy/webchat 3.50.0
- @sledge-app/js 2.0.114
- @adalong/widget 7.15.1
- parse 8.6.2
- and 21 more
66 third-party hosts added
202 files added

Questions about serlo.org

How does PageSourceSearch know what serlo.org 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 serlo.org 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 serlo.org?: 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 serlo.org?: 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.