How does PageSourceSearch know what effective-altruism.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 effective-altruism.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 effective-altruism.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 effective-altruism.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

effective-altruism.com

Built with gtm, @clerk/ui 1.34.0, algoliasearch.zendesk-hc 3.0.0, @miso.ai/client-sdk 1.13.1, dashjs 5.2.1, posthog-js 1.434.12, @reachfive/identity-core 1.42.0, @reachfive/identity-ui 2.1.0, jspdf 4.2.1, @cognigy/webchat 3.50.0, socket.io 0.1.0, amp and more. 5 pages and 108 stored files, last crawled 2026-10-02.

rank 426,918 35 libraries 0 identifiers 43 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
@clerk/ui	1.34.0	2026-10-02
algoliasearch.zendesk-hc	3.0.0	2026-10-02
@miso.ai/client-sdk	1.13.1	2026-10-02
dashjs	5.2.1	2026-10-02
posthog-js	1.434.12	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
@cognigy/webchat	3.50.0	2026-10-02
socket.io	0.1.0	2026-10-02
amp		2026-10-02
rsuite	6.2.4	2026-10-02
@segment/analytics-next	1.84.3	2026-10-02
formiojs	4.21.7	2026-10-02
@adalong/widget	7.15.1	2026-10-02
@meowwolf/meowwolf-main	1.5.2	2026-10-02
supafolio-sdk	1.4.1	2026-10-02
@videojs/cdn	10.0.0-rc.2	2026-10-02
ovenplayer	0.10.54	2026-10-02
graphql-playground-react	1.7.28	2026-10-02
@recogito/annotorious	2.7.14	2026-10-02
@johanaarstein/dotlottie-player	1.5.23	2026-10-02
@sledge-app/js	2.0.114	2026-10-02
@formio/js	5.6.1	2026-10-02
tripetto-services	2.1.1	2026-10-02
@widgetti/solara-vuetify-app	10.1.1	2026-10-02
mori-chat-widget	2.0.49	2026-10-02
@okta/okta-signin-widget	7.49.1	2026-10-02
@formbird/angular-elements	8.5.10	2026-10-02
comindware.core.ui	2.1.149	2026-10-02
player-venom	0.3.6	2026-09-24
@snowplow/browser-plugin-timezone	4.10.2	2026-09-24
vue3-sfc-loader	0.9.5	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 effective-altruism.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
airtable.com	connect	view source
aomedia.org	connect	view source
api.airtable.com	connect	view source
api.vimeo.com	connect	view source
app.posthog.com	connect	view source
cdn.ampproject.org	connect	view source
cdn.segment.com	connect	view source
effectivealtruism.my.site.com	connect	view source
embed.type3.audio	script connect	view source
fonts.googleapis.com	connect	view source
fonts.gstatic.com	connect	view source
forum.effectivealtruism.org	connect	view source
funds.effectivealtruism.org	connect	view source
github.com	connect	view source
googleads.g.doubleclick.net	connect	view source
i.ytimg.com	connect	view source
images.ctfassets.net	connect	view source
jobs.80000hours.org	connect	view source
jobs.probablygood.org	connect	view source
mailchi.mp	connect	view source
plausible.io	connect	view source
probablygood.org	connect	view source
reactjs.org	connect	view source
schema.org	connect	view source
sentry.io	connect	view source
static.doubleclick.net	connect	view source
tally.so	connect	view source
us.i.posthog.com	connect	view source
us.posthog.com	connect	view source
use.typekit.net	connect	view source
vercel.live	connect	view source
www.centreforeffectivealtruism.org	connect	view source
www.effectivealtruism.org	connect	view source
www.google.com	connect	view source
www.googleapis.com	connect	view source
www.googletagmanager.com	connect	view source
www.instagram.com	connect	view source
www.linkedin.com	connect	view source
www.w3.org	connect	view source
www.x.com	connect	view source
www.youtube-nocookie.com	connect	view source
www.youtube.com	connect	view source
yandex.com	connect	view source

Stored pages and scripts

The newest stored version of each file, newest first@if (p.FilesTruncated) { (the 500 newest of 108) }. 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.ampproject.org/v0.js	js library	not fetched	2026-10-02	current
https://www.effective-altruism.com/_next/static/chunks/9799.f2d39e600c7c66ae.js	js	11.9 KB	2026-10-02	current
https://www.googletagmanager.com/gtm.js?id=	js library	not fetched	2026-10-02	current
https://www.effective-altruism.com/_next/static/chunks/7496.88674e1aaf1cd0b4.js	js	1.6 KB	2026-10-02	current
https://www.effective-altruism.com/_next/static/chunks/6399.7ff8dfca2822a1a4.js	js	104 B	2026-10-02	current
https://www.effective-altruism.com/_next/static/chunks/4548.7aa78e81bc8a63bc.js	js	3.4 KB	2026-10-02	current
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https://www.effective-altruism.com/_next/static/chunks/331.0724389fd7405cec.js	js	23.3 KB	2026-10-02	current
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https://www.effective-altruism.com/_next/static/…destination.743d3cc4aa188c96.js	js	8.8 KB	2026-10-02	current
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https://www.effective-altruism.com/_next/static/…/auto-track.4fcdd65aee54b963.js	js	1.5 KB	2026-10-02	current
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https://www.effective-altruism.com/_next/static/…/stories-34e5d2733055844d.js	js	9.4 KB	2026-10-02	current
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https://www.effective-altruism.com/_next/static/…portunities-da515fed59bded34.js	js	649 B	2026-10-02	current
https://www.effective-altruism.com/_next/static/…truism-jobs-3cee65cdb442638c.js	js	588 B	2026-10-02	current
https://www.effective-altruism.com/_next/static/…internships-381c4d8f159063b7.js	js	602 B	2026-10-02	current
https://www.effective-altruism.com/_next/static/…ism-funding-f9d0cbee8a9c686c.js	js	594 B	2026-10-02	current
https://www.effective-altruism.com/_next/static/…fellowships-95ba4e9b8c4dc7de.js	js	602 B	2026-10-02	current
https://www.effective-altruism.com/_next/static/…uism-events-d2367091acb944e3.js	js	592 B	2026-10-02	current
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https://www.effective-altruism.com/_next/static/…sm-contests-d2114780f83f9f63.js	js	596 B	2026-10-02	current
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https://www.effective-altruism.com/_next/static/…portunities-38e5c861f994d4c8.js	js	437 B	2026-10-02	current
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https://www.effective-altruism.com/_next/static/…/grants-c2200697e584843b.js	js	6.1 KB	2026-10-02	current
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https://www.effective-altruism.com/_next/static/…zepLrQeyDWy4Q5V/_ssgManifest.js	js	1.5 KB	2026-10-02	2026-10-02
https://www.effective-altruism.com/_next/static/…/_buildManifest.js	js	7.9 KB	2026-10-02	2026-10-02
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https://www.effective-altruism.com/_next/static/…/framework-978a6051e6d0c57a.js	js	136.7 KB	2026-10-02	current
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https://www.effective-altruism.com/_next/static/…/polyfills-42372ed130431b0a.js	js	110 KB	2026-10-02	current
https://www.effective-altruism.com/courses/introductory-program	html	206.3 KB	2026-10-02	2026-10-02
https://www.effective-altruism.com/resources	html	215.2 KB	2026-10-02	2026-10-02
https://www.effective-altruism.com/faqs	html	210 KB	2026-10-02	2026-10-02
https://www.effective-altruism.com/articles/introduction-to-effective-altruism	html	387.5 KB	2026-10-02	2026-10-02
https://www.effective-altruism.com/	html	528.8 KB	2026-10-02	2026-10-02
https://www.effective-altruism.com/_next/static/…BAeaa9lHmhxHq82/_ssgManifest.js	js	1.5 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, 105 files, 4.1 MB; 31 libraries, 0 identifiers, 43 third-party hosts
31 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
- @segment/analytics-next 1.84.3
- and 19 more
44 third-party hosts added
- embed.type3.audio
- github.com
- vercel.live
- reactjs.org
- www.w3.org
- fonts.googleapis.com
- fonts.gstatic.com
- use.typekit.net
- cdn.segment.com
- plausible.io
- www.effectivealtruism.org
- www.googletagmanager.com
- and 32 more
105 files added

Questions about effective-altruism.com

How does PageSourceSearch know what effective-altruism.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 effective-altruism.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 effective-altruism.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 effective-altruism.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.