How does PageSourceSearch know what esl-idiomas.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 esl-idiomas.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 esl-idiomas.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 esl-idiomas.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

esl-idiomas.com

Built with select2 4.1.0, @popperjs/core 2.11.6, gtm, jquery-validation 1.21.0, tippy.js 6.3.7, @fancyapps/fancybox 3.5.7, @inkeep/cxkit-js 0.5.119, immortal-db 1.1.0, @feathery/react 2.96.0, @reachfive/identity-ui 2.1.0, waypoints 4.0.1, google-apis and more. 5 pages and 162 stored files, last crawled 2026-10-02.

rank 537,905 75 libraries 3 identifiers 35 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
select2	4.1.0	2026-10-02
@popperjs/core	2.11.6	2026-10-02
gtm		2026-10-02
jquery-validation	1.21.0	2026-10-02
tippy.js	6.3.7	2026-10-02
@fancyapps/fancybox	3.5.7	2026-10-02
@inkeep/cxkit-js	0.5.119	2026-10-02
immortal-db	1.1.0	2026-10-02
@feathery/react	2.96.0	2026-10-02
@reachfive/identity-ui	2.1.0	2026-10-02
waypoints	4.0.1	2026-10-02
google-apis		2026-10-02
cloudflare-turnstile		2026-10-02
mdbootstrap	4.20.0	2026-10-02
p5	2.3.3	2026-10-02
vimeo-player		2026-10-02
jsonld	9.0.0	2026-10-02
bootstrap-italia	2.18.3	2026-10-02
jsxgraph	1.13.3	2026-10-02
survey-js-ui	3.1.1	2026-10-02
jackocnr/intl-tel-input	v24.1.1	2026-10-02
spirhal	4.5.0	2026-10-02
webex	3.12.0	2026-10-02
volantis-static	0.0.1761982841160	2026-10-02
jquery.flipster	1.1.6	2026-10-02
image-picker	0.3.1	2026-10-02
@vitest/utils	5.0.2	2026-10-02
@walletconnect/web3-provider	1.8.0	2026-10-02
@recogito/annotorious	2.7.14	2026-10-02
x3.photo.gallery	3.34.2	2026-10-02
replaywebpage	2.5.3	2026-10-02
@pdftron/pdfjs-express-viewer	8.7.5	2026-10-02
@formio/js	5.6.1	2026-10-02
@descope/web-components-ui	3.21.0	2026-10-02
@machi-pla/japan_concierge_2024	0.1.5	2026-10-02
@astrouxds/astro-web-components	8.0.0	2026-10-02
@commercelayer/drop-in.js	2.27.0	2026-10-02
antdv-next	1.5.4	2026-10-02
hexo-theme-keep	4.3.0	2026-10-02
@widgetti/solara-vuetify-app	10.1.1	2026-10-02
revslider	5.4.201-8.6	2026-10-02
jqwidgets-scripts	27.0.1	2026-10-02
bulma-calendar	7.1.1	2026-10-02
@everymatrix/player-profile-dashboard	1.21.0	2026-10-02
@anyline/anyline-js	56.1.3	2026-10-02
@formbird/angular-elements	8.5.10	2026-10-02
@unidy.io/sdk	1.12.0	2026-10-02
wonder-image	2.1.2-alpha.4	2026-10-02
comindware.core.ui	2.1.149	2026-10-02
@grigorov-it/mazer	2.2.0	2026-10-02
@pydantic/ai-chat-ui	2.3.0	2026-10-02
jquery	1.7.2	2026-09-24
@clerk/clerk-js	6.33.0	2026-09-24
@zonos/elements	1.3.289	2026-09-24
@findify/bundle	7.1.108	2026-09-24
webc-miam	10.8.0	2026-09-24
bromcom-ui	2.12.3	2026-09-24
cloudinary-video-player	4.1.2	2026-09-24
typesense	3.0.6	2026-09-24
@esm-bundle/rxjs	7.8.1	2026-09-24
@veltdev/sdk	6.0.14	2026-09-24
anfuns-assets	1.0.10	2026-09-24
tabbable	6.5.0	2026-09-24
@speechkit/speechkit-audio-player	3.18.30	2026-09-24
loadjs	4.3.0	2026-09-24
c2pa-wc	0.14.17	2026-09-24
@stlite/mountable	0.75.0	2026-09-24
@jupyter-widgets/html-manager	1.0.15	2026-09-24
@embedpdf/snippet	2.15.1	2026-09-24
biel-search	0.1.89	2026-09-24
unhead	3.4.1	2026-09-24
@pdftron/webviewer	12.1.0	2026-09-24
quill-table-better	1.2.3	2026-09-24
@walletconnect/qrcode-modal	1.8.0	2026-09-24
@getopenpay/openpay-js	0.5.25	2026-09-24

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
Google site verification (Google)	a7hy_A3EtLWKNyXNin9HwoEd4tjx89XcjYwaDpDhZW4	view source
Google Tag Manager container (Google)	GTM-NL4QFJKH	view source
reCAPTCHA site key (Google)	0x4AAAAAAAB7AW3O8iWJGMua	view source

Third-party hosts

Hosts outside esl-idiomas.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
apikeys.civiccomputing.com	connect	view source
apis.google.com	connect	view source
apiv2-dev.klgintdc.com	connect	view source
apps.elfsight.com	connect	view source
artifacts.flywire.com	connect	view source
assetlibs.kaplaninternational.com	connect	view source
assets.pinterest.com	connect	view source
blog.esl-languages.com	script stylesheet	view source
cc.cdn.civiccomputing.com	connect	view source
cdn.jsdelivr.net	script stylesheet	view source
cdnjs.cloudflare.com	script stylesheet	view source
challenges.cloudflare.com	script	view source
clapi.civiccomputing.com	connect	view source
core.service.elfsight.com	connect	view source
dash.elfsight.com	connect	view source
elfsight.com	connect	view source
elfsightcdn.com	script	view source
fonts.googleapis.com	stylesheet	view source
github.com	connect	view source
go.elfsight.io	connect	view source
iabeurope.eu	connect	view source
img.youtube.com	connect	view source
maps.google.com	script connect	view source
payment.flywire.com	connect	view source
player.vimeo.com	connect	view source
static.elfsight.com	script connect	view source
twitter.com	connect	view source
unpkg.com	script stylesheet	view source
www.civicuk.com	connect	view source
www.facebook.com	connect	view source
www.googletagmanager.com	iframe connect	view source
www.pinterest.com	connect	view source
www.w3.org	connect	view source
www.youtube-nocookie.com	connect	view source
www.youtube.com	iframe connect	view source

Stored pages and scripts

The newest stored version of each file, newest first@if (p.FilesTruncated) { (the 500 newest of 162) }. 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://apis.google.com/js/plusone.js	js library	not fetched	2026-10-02	current
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https://cdn.jsdelivr.net/gh/jackocnr/intl-tel-in…/intlTelInputWithUtils.min.js	js library	not fetched	2026-10-02	current
https://cdn.jsdelivr.net/npm/jquery-validation@1…/dist/jquery.validate.min.js	js library	not fetched	2026-10-02	current
https://cdnjs.cloudflare.com/ajax/libs/image-picker/0.3.1/image-picker.js	js library	not fetched	2026-10-02	current
https://challenges.cloudflare.com/turnstile/v0/a…rnstileCallback&render=explicit	js library	not fetched	2026-10-02	current
https://player.vimeo.com/api/player.js	js library	not fetched	2026-10-02	current
https://unpkg.com/@popperjs/[email protected]/dist/umd/popper.js	js library	not fetched	2026-10-02	current
https://unpkg.com/[email protected]/dist/tippy.umd.js	js library	not fetched	2026-10-02	current
https://www.esl-idiomas.com/themes/custom/esl_th…/dist/807.e8f2db539672ffc9.js	js	279 KB	2026-10-02	current
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https://www.esl-idiomas.com/sites/default/files/…vuFG_4pMkhv5q6xQa5ge-fPzCUa1QM0	js	18.1 KB	2026-10-02	2026-10-02
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https://www.esl-idiomas.com/modules/custom/esl_c…finder-results.loader.js?tm6bhk	js	507 B	2026-10-02	2026-10-02
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https://blog.esl-idiomas.com/wp-content/themes/s…/js/build/init.js?ver=18.2.1	js	386.7 KB	2026-10-02	current
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https://blog.esl-idiomas.com/wp-content/themes/s…/anime.min.js?ver=4.5.1	js library	17.3 KB	2026-10-02	current
https://blog.esl-idiomas.com/wp-content/themes/s…/jquery.fancybox.js?ver=18.2.1	js	68.6 KB	2026-10-02	current
https://blog.esl-idiomas.com/wp-content/themes/s…/hoverintent.min.js?ver=1.9	js library	2.2 KB	2026-10-02	current
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https://blog.esl-idiomas.com/wp-content/themes/s…/waypoints.js?ver=4.0.2	js	8.8 KB	2026-10-02	current
https://blog.esl-idiomas.com/wp-content/themes/s…/transit.min.js?ver=0.9.9	js	7.2 KB	2026-10-02	current
https://blog.esl-idiomas.com/wp-content/themes/s…/build/priority.js?ver=18.2.1	js	1.9 KB	2026-10-02	current
https://blog.esl-idiomas.com/wp-content/themes/s…/jquery.easing.min.js?ver=1.3	js	2.3 KB	2026-10-02	current
https://blog.esl-idiomas.com/wp-content/themes/e…/js/scripts.js?ver=1.0	js	1.9 KB	2026-10-02	current
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https://www.esl-idiomas.com/es/presupuesto	html	280.1 KB	2026-10-02	2026-10-02
https://www.esl-idiomas.com/es/course-finder	html	272.5 KB	2026-10-02	2026-10-02
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https://www.esl-idiomas.com/es	html	430.8 KB	2026-10-02	2026-10-02
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https://www.esl-idiomas.com/themes/custom/esl_th…/forms/selectbox.js?tlvj14	js	510 B	2026-09-24	current
https://www.esl-idiomas.com/libraries/select2/dist/js/select2.min.js?tlvj14	js library	72.6 KB	2026-09-24	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, 84 files, 11 MB; 51 libraries, 3 identifiers, 35 third-party hosts
51 libraries added
- @vitest/utils 5.0.2
- gtm
- jqwidgets-scripts 27.0.1
- @recogito/annotorious 2.7.14
- webex 3.12.0
- jsonld 9.0.0
- survey-js-ui 3.1.1
- @machi-pla/japan_concierge_2024 0.1.5
- @descope/web-components-ui 3.21.0
- @formbird/angular-elements 8.5.10
- @everymatrix/player-profile-dashboard 1.21.0
- @pydantic/ai-chat-ui 2.3.0
- and 39 more
3 identifiers added
- GTM-NL4QFJKH Google Tag Manager container
- a7hy_A3EtLWKNyXNin9HwoEd4tjx89XcjYwaDpDhZW4 Google site verification
- 0x4AAAAAAAB7AW3O8iWJGMua reCAPTCHA site key
43 third-party hosts added
84 files added

Questions about esl-idiomas.com

How does PageSourceSearch know what esl-idiomas.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 esl-idiomas.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 esl-idiomas.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 esl-idiomas.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.