How does PageSourceSearch know what letterenfonds.nl 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 letterenfonds.nl 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 letterenfonds.nl?

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 letterenfonds.nl?

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

letterenfonds.nl

Built with webpack, @clerk/ui 1.34.0, instantsearch.js 4.118.0, algoliasearch.zendesk-hc 3.0.0, @findify/bundle 7.1.108, lottie-web 5.13.0, bromcom-ui 2.12.3, @lottiefiles/lottie-player 2.0.12, @feathery/react 2.96.0, tableexport.jquery.plugin 1.33.0, cookiebot, face-age 2.4.6 and more. 5 pages and 204 stored files, last crawled 2026-10-02.

rank 425,977 27 libraries 0 identifiers 17 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
webpack		2026-10-02
@clerk/ui	1.34.0	2026-10-02
instantsearch.js	4.118.0	2026-10-02
algoliasearch.zendesk-hc	3.0.0	2026-10-02
@findify/bundle	7.1.108	2026-10-02
lottie-web	5.13.0	2026-10-02
bromcom-ui	2.12.3	2026-10-02
@lottiefiles/lottie-player	2.0.12	2026-10-02
@feathery/react	2.96.0	2026-10-02
tableexport.jquery.plugin	1.33.0	2026-10-02
cookiebot		2026-10-02
face-age	2.4.6	2026-10-02
@aurolabs/auro-back-to-top	1.1.0	2026-10-02
@oiz/stzh-components	4.16.0	2026-10-02
webtorrent	3.0.21	2026-10-02
docs-searchbar.js	2.5.0	2026-10-02
@johanaarstein/dotlottie-player	1.5.23	2026-10-02
@formbird/angular-elements	8.5.10	2026-10-02
sheryjs	1.0.0-beta.0.1.8	2026-10-02
@story-telling-reporter/react-embed-code-generator	2.2.20	2026-10-02
flowbitz	2.4.5	2026-10-02
@percy.ai/hvs-funnel-overlay	0.5.13	2026-10-02
comindware.core.ui	2.1.149	2026-10-02
@solace-health/solace-entry-widget	2.0.5	2026-10-02
@zonos/elements	1.3.289	2026-09-24
@epigraph/configurator	2.7.0	2026-09-24
replaywebpage	2.5.3	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 letterenfonds.nl 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.jsdelivr.net	connect	view source
consent.cookiebot.com	connect	view source
example.com	connect	view source
fonts.googleapis.com	connect	view source
fonts.gstatic.com	connect	view source
letterenfonds.matomo.cloud	connect	view source
reactjs.org	connect	view source
schema.org	connect	view source
sfapi.formstack.io	connect	view source
twitter.com	connect	view source
use.typekit.net	connect	view source
www.algolia.com	connect	view source
www.facebook.com	connect	view source
www.google.com	connect	view source
www.linkedin.com	connect	view source
www.w3.org	connect	view source
www.youtube-nocookie.com	connect	view source

Stored pages and scripts

The newest stored version of each file, newest first@if (p.FilesTruncated) { (the 500 newest of 204) }. 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.letterenfonds.nl/contact	html	210 KB	2026-10-02	2026-10-02
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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, 201 files, 4.2 MB; 24 libraries, 0 identifiers, 17 third-party hosts
24 libraries added
- tableexport.jquery.plugin 1.33.0
- comindware.core.ui 2.1.149
- @findify/bundle 7.1.108
- @aurolabs/auro-back-to-top 1.1.0
- @oiz/stzh-components 4.16.0
- docs-searchbar.js 2.5.0
- webpack
- @clerk/ui 1.34.0
- @feathery/react 2.96.0
- @solace-health/solace-entry-widget 2.0.5
- @story-telling-reporter/react-embed-code-generator 2.2.20
- sheryjs 1.0.0-beta.0.1.8
- and 12 more
17 third-party hosts added
201 files added

Questions about letterenfonds.nl

How does PageSourceSearch know what letterenfonds.nl 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 letterenfonds.nl 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 letterenfonds.nl?: 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 letterenfonds.nl?: 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.