How does PageSourceSearch know what algoexpert.io 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 algoexpert.io 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 algoexpert.io?

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 algoexpert.io?

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

algoexpert.io

Built with gtm, react 18, gtag, @wix/design-system 1.328.0, @scandit/web-datacapture-core 8.6.0, react-dom 18, @glidejs/glide 3.7.1, prismjs 1.30.0, @amplitude/amplitude-js-gtm 3.25.0, d3 7.9.0, tinymce 8.9.2, swagger-ui-dist 5.33.0 and more. 1 page and 172 stored files, last crawled 2026-10-02.

rank 421,596 74 libraries 0 identifiers 45 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
react	18	2026-10-02
gtag		2026-10-02
@wix/design-system	1.328.0	2026-10-02
@scandit/web-datacapture-core	8.6.0	2026-10-02
react-dom	18	2026-10-02
@glidejs/glide	3.7.1	2026-10-02
prismjs	1.30.0	2026-10-02
@amplitude/amplitude-js-gtm	3.25.0	2026-10-02
d3	7.9.0	2026-10-02
tinymce	8.9.2	2026-10-02
swagger-ui-dist	5.33.0	2026-10-02
@tensorflow/tfjs	4.22.0	2026-10-02
in-renderer-js	1.2.3	2026-10-02
@feathery/react	2.96.0	2026-10-02
google-analytics		2026-10-02
facebook-pixel		2026-10-02
facebook-sdk		2026-10-02
recaptcha		2026-10-02
@reachfive/identity-ui	2.1.0	2026-10-02
kore-web-sdk	11.28.1	2026-10-02
recharts	3.10.1	2026-10-02
docsify	5.0.0	2026-10-02
google-apis		2026-10-02
easymde	2.21.0	2026-10-02
bootstrap-italia	2.18.3	2026-10-02
formiojs	4.21.7	2026-10-02
d3-delaunay	6.0.4	2026-10-02
@modelcontextprotocol/server	2.1.0	2026-10-02
@stlite/mountable	0.75.0	2026-10-02
@jupyter-widgets/html-manager	1.0.15	2026-10-02
@tolgee/web	7.2.1	2026-10-02
webex	3.12.0	2026-10-02
vditor	4.0.0	2026-10-02
@opentok/client	2.35.2	2026-10-02
@oiz/stzh-components	4.16.0	2026-10-02
@snowplow/browser-plugin-vimeo-tracking	4.10.2	2026-10-02
graphql-playground-react	1.7.28	2026-10-02
filterizr	2.2.4	2026-10-02
@tensorflow-models/face-landmarks-detection	1.0.6	2026-10-02
kifu-for-js	5.5.0	2026-10-02
recharts-scale	0.4.5	2026-10-02
react-smooth	4.0.4	2026-10-02
ideogram	1.53.0	2026-10-02
@machi-pla/cc-client-js-sendai-city	0.2.1	2026-10-02
gidx-js	0.6.3	2026-10-02
@astrouxds/astro-web-components	8.0.0	2026-10-02
tonweb	0.0.66	2026-10-02
@teipublisher/pb-components	3.6.8	2026-10-02
@accusoft/pdf-viewer	3.11.158639	2026-10-02
grapesjs	0.23.6	2026-10-02
dmn-js	17.12.0	2026-10-02
@apollographql/graphql-playground-react	1.7.42	2026-10-02
@ant-design/x	2.9.0	2026-10-02
aframe	1.8.0	2026-10-02
@widgetti/solara-vuetify-app	10.1.1	2026-10-02
bulma-calendar	7.1.1	2026-10-02
lucid-ui	8.16.0	2026-10-02
@formbird/angular-elements	8.5.10	2026-10-02
wonder-image	2.1.2-alpha.4	2026-10-02
altair-static	8.5.9	2026-10-02
peachy-booking-flow	1.11.6	2026-10-02
@story-telling-reporter/react-embed-code-generator	2.2.20	2026-10-02
comindware.core.ui	2.1.149	2026-10-02
@snapshot-labs/snapshot.js	0.17.5	2026-10-02
@limetech/lime-elements	40.5.1	2026-10-02
@wix/image	1.454.0	2026-10-02
dropzone-exif-fix	5.9.3-B	2026-10-02
@solace-health/solace-entry-widget	2.0.5	2026-10-02
@marimo-team/frontend	0.25.0	2026-09-24
klaro	0.7.21	2026-09-24
@cdek-it/widget	4.0.0	2026-09-24
reverie-stt-sdk	0.24.0	2026-09-24
amazon-cognito-identity-js	6.3.20	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 algoexpert.io 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
algoexpert-workspace.firebaseio.com	connect	view source
api.frontendexpert.io	connect	view source
apis.google.com	connect	view source
chain.link	connect	view source
clementmihailescu.github.io	connect	view source
education.github.com	connect	view source
fcmregistrations.googleapis.com	connect	view source
firebase.googleapis.com	connect	view source
firebaseinstallations.googleapis.com	connect	view source
firebaselogging.googleapis.com	connect	view source
firebaseremoteconfig.googleapis.com	connect	view source
github.com	connect	view source
identitytoolkit.googleapis.com	connect	view source
js.stripe.com	connect	view source
json-schema.org	connect	view source
maps.googleapis.com	connect	view source
mastodon.social	connect	view source
networkadvertising.org	connect	view source
player.vimeo.com	connect	view source
racecondition.software	connect	view source
raw.githubusercontent.com	connect	view source
reactjs.org	connect	view source
securetoken.googleapis.com	connect	view source
staging-identitytoolkit.sandbox.googleapis.com	connect	view source
staging-securetoken.sandbox.googleapis.com	connect	view source
staging-www.sandbox.googleapis.com	connect	view source
stripe.com	connect	view source
test-identitytoolkit.sandbox.googleapis.com	connect	view source
test-securetoken.sandbox.googleapis.com	connect	view source
twilio.com	connect	view source
twitter.com	connect	view source
unpkg.com	connect	view source
vimeo.com	connect	view source
www-googleapis-test.sandbox.google.com	connect	view source
www.artofvelocity.com	connect	view source
www.firepad.io	connect	view source
www.google.com	connect	view source
www.googleapis.com	connect	view source
www.googletagmanager.com	iframe connect	view source
www.linkedin.com	connect	view source
www.paypal.com	connect	view source
www.programmingexpert.io	connect	view source
www.w3.org	connect	view source
www.youtube.com	connect	view source
youtu.be	connect	view source

Stored pages and scripts

The newest stored version of each file, newest first@if (p.FilesTruncated) { (the 500 newest of 172) }. 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/api.js?onload=%25%7Bonload%7D	js library	not fetched	2026-10-02	current
https://apis.google.com/js/client.js?onload=%25%7Bonload%7D	js library	not fetched	2026-10-02	current
https://connect.facebook.net/en_US/fbevents.js	js library	not fetched	2026-10-02	current
https://connect.facebook.net/signals/config/1189…155%2C169%2C45%2C121%2C13%2C188	js library	not fetched	2026-10-02	2026-10-02
https://unpkg.com/react-dom@18/umd/react-dom.production.min.js	js library	not fetched	2026-10-02	current
https://unpkg.com/react@18/umd/react.production.min.js	js library	not fetched	2026-10-02	current
https://www.google-analytics.com/analytics.js	js library	not fetched	2026-10-02	current
https://www.google.com/recaptcha/api.js?onload=%…&render=explicit&hl=%25%7Bhl%7D	js library	not fetched	2026-10-02	current
https://www.googletagmanager.com/gtag/destinatio…&l=aeDataLayer&cx=c&gtm=4e69u2	js library	not fetched	2026-10-02	2026-10-02
https://www.googletagmanager.com/gtag/js?id=G-4K…&l=aeDataLayer&cx=c&gtm=4e69u2	js library	not fetched	2026-10-02	2026-10-02
https://www.googletagmanager.com/gtm.js?id=GTM-P…=env-2&gtm_cookies_win=x	js library	not fetched	2026-10-02	current
https://assets.algoexpert.io/spas/main/prod/g1dc…/js/04c5b7dcc54a3df44e1f.js	js	1.1 KB	2026-10-02	current
https://assets.algoexpert.io/spas/main/prod/g1dc…/js/213f66e7b0bef2c1980f.js	js	45.9 KB	2026-10-02	current
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https://connect.facebook.net/signals/config/1189…155%2C168%2C45%2C121%2C13%2C187	js library	not fetched	2026-09-24	current
https://www.googletagmanager.com/gtag/destinatio…&l=aeDataLayer&cx=c&gtm=4e69n0	js library	not fetched	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

1 page, 169 files, 7.7 MB; 69 libraries, 0 identifiers, 45 third-party hosts
69 libraries added
- @wix/image 1.454.0
- formiojs 4.21.7
- @machi-pla/cc-client-js-sendai-city 0.2.1
- kifu-for-js 5.5.0
- @feathery/react 2.96.0
- swagger-ui-dist 5.33.0
- @tolgee/web 7.2.1
- @solace-health/solace-entry-widget 2.0.5
- @reachfive/identity-ui 2.1.0
- @widgetti/solara-vuetify-app 10.1.1
- comindware.core.ui 2.1.149
- graphql-playground-react 1.7.28
- and 57 more
46 third-party hosts added
- www.googletagmanager.com
- www.w3.org
- www.programmingexpert.io
- github.com
- reactjs.org
- twilio.com
- json-schema.org
- raw.githubusercontent.com
- www.linkedin.com
- www.youtube.com
- racecondition.software
- mastodon.social
- and 34 more
169 files added

Questions about algoexpert.io

How does PageSourceSearch know what algoexpert.io 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 algoexpert.io 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 algoexpert.io?: 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 algoexpert.io?: 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.