How does PageSourceSearch know what 21st.dev 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 21st.dev 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 21st.dev?

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 21st.dev?

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

21st.dev

Built with gtm, gtag, @clerk/clerk-js 6.33.0, @clerk/ui 1.34.0, @splinetool/runtime 2.0.56, lottie-web 5.13.0, @blotoutio/providers-blotout-consent-sdk 1.73.0, dashjs 5.2.1, @marimo-team/frontend 0.25.0, @reachfive/identity-core 1.42.0, @reachfive/identity-ui 2.1.0, jspdf 4.2.1 and more. 5 pages and 222 stored files, last crawled 2026-10-02.

rank 587,436 67 libraries 2 identifiers 99 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
gtag		2026-10-02
@clerk/clerk-js	6.33.0	2026-10-02
@clerk/ui	1.34.0	2026-10-02
@splinetool/runtime	2.0.56	2026-10-02
lottie-web	5.13.0	2026-10-02
@blotoutio/providers-blotout-consent-sdk	1.73.0	2026-10-02
dashjs	5.2.1	2026-10-02
@marimo-team/frontend	0.25.0	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
oidc-client	1.11.5	2026-10-02
exceljs	4.4.0	2026-10-02
lz-string	1.5.0	2026-10-02
cloudflare-turnstile		2026-10-02
universalviewer	4.4.4	2026-10-02
@scalar/api-reference	1.71.0	2026-10-02
threejs-components	0.0.30	2026-10-02
@moveo-ai/web-client	0.119.0	2026-10-02
@rsbuild/core	2.2.9	2026-10-02
@tolgee/web	7.2.1	2026-10-02
@marimo-team/islands	0.25.0	2026-10-02
vue3-sfc-loader	0.9.5	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
@machi-pla/ai-chatbot	0.1.25	2026-10-02
replaywebpage	2.5.3	2026-10-02
@loaders.gl/i3s	4.5.2	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
dmn-js	17.12.0	2026-10-02
@ant-design/x	2.9.0	2026-10-02
aframe	1.8.0	2026-10-02
@pierre/diffs	1.5.1	2026-10-02
@tsocial/tvweb-sdk	5.38.6	2026-10-02
@crystaldesign/diva-core	26.11.0	2026-10-02
@thesvg/icons	3.3.8	2026-10-02
@inkeep/agents-ui-js-cloud	0.17.8	2026-10-02
@waniwani/sdk	0.21.3	2026-10-02
@formbird/angular-elements	8.5.10	2026-10-02
@joyfill/components	4.0.0-rc26	2026-10-02
@gradio/lite	5.45.0	2026-10-02
@percy.ai/your-team	1.1.10	2026-10-02
veris-storybook-beta	0.1.81-react-upgrade	2026-10-02
@pyscript/core	0.7.31	2026-10-02
@perceptimagery/sprie-widget	1.3.3015	2026-10-02
machinelearn	2.1.5	2026-10-02
@pydantic/ai-chat-ui	2.3.0	2026-10-02
coherentpdf	2.5.5	2026-10-02
@lottiefiles/lottie-player	2.0.12	2026-09-24
kore-web-sdk	11.28.1	2026-09-24
vanta	0.5.24	2026-09-24
spectorjs	0.9.33	2026-09-24
preline	5.0.0	2026-09-24
three-globe	2.45.2	2026-09-24
mtr-facemesh	7.8.0	2026-09-24
globe.gl	2.46.2	2026-09-24
@alfatech/livechat	2026.9.0-9.2	2026-09-24
webtorrent	3.0.21	2026-09-24
webcrypto	0.1.1	2026-09-24
@walletconnect/client	1.8.0	2026-09-24
@shikijs/langs	4.4.3	2026-09-24
@memori.ai/memori-webcomponent	8.3.3	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 Analytics 4 measurement id (Google)	G-X7C2K3V7GX	view source
Google Tag Manager container (Google)	GTM-T76WQSTW	view source

Third-party hosts

Hosts outside 21st.dev 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
1code.dev	connect	view source
21.up.railway.app	connect	view source
21st.tolt.io	connect	view source
api.clerk.com	connect	view source
api.clerkstage.dev	connect	view source
api.codesandbox.io	connect	view source
api.lclclerk.com	connect	view source
app.rallly.co	connect	view source
audiobooks.dev	connect	view source
avatars.githubusercontent.com	connect	view source
base-ui.com	connect	view source
bettershift.pantelx.com	connect	view source
camo.githubusercontent.com	connect	view source
cdn.discordapp.com	connect	view source
cdn.jsdelivr.net	connect	view source
challenges.cloudflare.com	connect	view source
circle.lndev.me	connect	view source
clerk-telemetry.com	connect	view source
cloud.umami.is	connect	view source
codesandbox.io	connect	view source
cursor.com	connect	view source
dashboard.clerk.com	connect	view source
demo.actualbudget.org	connect	view source
demo.edgeever.org	connect	view source
demo.faved.to	connect	view source
demo.homarr.dev	connect	view source
demo.immich.app	connect	view source
demo.jellyfin.org	connect	view source
demo.kimai.org	connect	view source
demo.libredesk.io	connect	view source
demo.linkding.link	connect	view source
demo.linkwarden.app	connect	view source
demo.listmonk.app	connect	view source
demo.mealie.io	connect	view source
demo.openpanel.dev	connect	view source
demo.rybbit.com	connect	view source
demo.us.espocrm.com	connect	view source
demo.usememos.com	connect	view source
demo.wallosapp.com	connect	view source
discord.gg	connect	view source
easyinvoicepdf.com	connect	view source
excalidraw.com	connect	view source
external-content.duckduckgo.com	connect	view source
feedback.fider.io	connect	view source
finapp.ilko.me	connect	view source
fonts.googleapis.com	connect	view source
foo.com	connect	view source
ghostfol.io	connect	view source
github.com	connect	view source
goniszewski.com	connect	view source
hash-calendar.netlify.app	connect	view source
heroicons.com	connect	view source
hoppscotch.io	connect	view source
hr.demo.horilla.com	connect	view source
hugeicons.com	connect	view source
img.clerk.com	connect	view source
invoice.stripe.com	connect	view source
it-tools.tech	connect	view source
jsoncrack.com	connect	view source
kan.bn	connect	view source
lens.bh8.ga	connect	view source
lucide.dev	connect	view source
lyftr-demo.fly.dev	connect	view source
marmelab.com	connect	view source
meerkat-crm-demo.fly.dev	connect	view source
mermaid.live	connect	view source
metabase-public.metabaseapp.com	connect	view source
nextjs.org	connect	view source
oss-3d195f3577ba42a1a99a9c9be9b70a19.21st.app	connect	view source
oss-b20fae016e414f949ef04fcc8917ad42.21st.app	connect	view source
oss-e43ad7c363ef4ef29188747efe13cb54.21st.app	connect	view source
pbs.twimg.com	connect	view source
phosphoricons.com	connect	view source
plausible.io	connect	view source
prebuiltui.com	connect	view source
pub-d2a7943f757e46d59fd4e364dbae76ae.r2.dev	connect	view source
react.dev	connect	view source
registry.npmjs.org	connect	view source
remixicon.com	connect	view source
res.cloudinary.com	connect	view source
shadcnuikit.com	connect	view source
shaders.paper.design	connect	view source
silverbullet.md	connect	view source
squoosh.app	connect	view source
status.openstatus.dev	connect	view source
tabler.io	connect	view source
templates.getgrist.com	connect	view source
try.karakeep.app	connect	view source
ui.shadcn.com	connect	view source
usewaypoint.github.io	connect	view source
vercel.live	connect	view source
visx.airbnb.tech	connect	view source
vucvdpamtrjkzmubwlts.supabase.co	connect	view source
workout.cool	connect	view source
www.google.com	connect	view source
www.googletagmanager.com	script iframe	view source
www.liftcuttracker.com	connect	view source
www.open-resume.com	connect	view source
www.w3.org	connect	view source

Stored pages and scripts

The newest stored version of each file, newest first@if (p.FilesTruncated) { (the 500 newest of 222) }. 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://challenges.cloudflare.com/turnstile/v0/api.js?render=explicit	js library	not fetched	2026-10-02	current
https://www.googletagmanager.com/gtag/js?id=G-X7C2K3V7GX	js library	not fetched	2026-10-02	current
https://21st.dev/_next/static/chunks/967.d30702907c6844db.js	js	24.4 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, 16.5 MB; 54 libraries, 2 identifiers, 99 third-party hosts
54 libraries added
- gtag
- gtm
- @inkeep/agents-ui-js-cloud 0.17.8
- @clerk/ui 1.34.0
- @ant-design/x 2.9.0
- @joyfill/components 4.0.0-rc26
- @moveo-ai/web-client 0.117.0
- @marimo-team/frontend 0.25.0
- @blotoutio/providers-blotout-consent-sdk 1.73.0
- @clerk/clerk-js 6.33.0
- jspdf 4.2.1
- @reachfive/identity-core 1.42.0
- and 42 more
2 identifiers added
- G-X7C2K3V7GX Google Analytics 4 measurement id
- GTM-T76WQSTW Google Tag Manager container
100 third-party hosts added
- www.googletagmanager.com
- www.googletagmanager.com
- react.dev
- www.w3.org
- vercel.live
- api.lclclerk.com
- api.clerkstage.dev
- api.clerk.com
- github.com
- nextjs.org
- cursor.com
- www.google.com
- and 88 more
202 files added

Questions about 21st.dev

How does PageSourceSearch know what 21st.dev 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 21st.dev 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 21st.dev?: 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 21st.dev?: 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.