How does PageSourceSearch know what ffern.co 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 ffern.co 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 ffern.co?

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 ffern.co?

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

ffern.co

Built with @clerk/ui 1.34.0, libphonenumber-js 1.13.14, @miso.ai/client-sdk 1.13.1, dashjs 5.2.1, @marimo-team/frontend 0.25.0, swagger-ui-dist 5.33.0, @inkeep/cxkit-js 0.5.119, @mux/mux-player 3.13.4, @feathery/react 2.98.1, stripe-js 8.11.0, exceljs 4.4.0, @farcaster/miniapp-sdk 0.3.0 and more. 6 pages and 321 stored files, last crawled 2026-10-02.

rank 531,515 45 libraries 1 identifier 34 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
@clerk/ui	1.34.0	2026-10-02
libphonenumber-js	1.13.14	2026-10-02
@miso.ai/client-sdk	1.13.1	2026-10-02
dashjs	5.2.1	2026-10-02
@marimo-team/frontend	0.25.0	2026-10-02
swagger-ui-dist	5.33.0	2026-10-02
@inkeep/cxkit-js	0.5.119	2026-10-02
@mux/mux-player	3.13.4	2026-10-02
@feathery/react	2.98.1	2026-10-02
stripe-js	8.11.0	2026-10-02
exceljs	4.4.0	2026-10-02
@farcaster/miniapp-sdk	0.3.0	2026-10-02
@supabase/phoenix	0.4.5	2026-10-02
spectorjs	0.9.33	2026-10-02
@moveo-ai/web-client	0.117.0	2026-10-02
webtorrent	3.0.21	2026-10-02
@walletconnect/web3-provider	1.8.0	2026-10-02
@johanaarstein/dotlottie-player	1.5.23	2026-10-02
@maveio/components	0.0.192	2026-10-02
replaywebpage	2.5.3	2026-10-02
wsemi	1.9.3	2026-10-02
tonweb	0.0.66	2026-10-02
@accusoft/pdf-viewer	3.11.158639	2026-10-02
@ant-design/x	2.9.0	2026-10-02
mori-chat-widget	2.0.49	2026-10-02
@tsocial/tvweb-sdk	5.38.6	2026-10-02
xlsx-populate	1.21.0	2026-10-02
cobrowse-sdk-js	3.28.7	2026-10-02
@okta/okta-signin-widget	7.49.1	2026-10-02
wonder-image	2.1.2-alpha.4	2026-10-02
@gaia-project/viewer	5.12.0	2026-10-02
@joyfill/components	4.0.0-rc26	2026-10-02
tcplayer.js	5.3.4	2026-10-02
machinelearn	2.1.5	2026-10-02
@zappway/embeds	2.0.28	2026-10-02
@pydantic/ai-chat-ui	2.3.0	2026-10-02
@chativa/connector-directline	0.15.0	2026-10-02
coherentpdf	2.5.5	2026-10-02
@huolala-tech/page-spy-plugin-ospy	2.4.0	2026-10-02
@wix/design-system	1.328.0	2026-09-24
oidc-client	1.11.5	2026-09-24
@videojs/cdn	10.0.0-rc.2	2026-09-24
@alfatech/livechat	2026.9.0-9.2	2026-09-24
@feedmepos/mf-menu	0.32.80-alpha.2	2026-09-24
webcrypto	0.1.1	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)	oe7jqQsNDV4yIEZBEYB5dHGJyVXcHcpOueKXci8nAQs	view source

Third-party hosts

Hosts outside ffern.co 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
aomedia.org	connect	view source
betterstack.net	connect	view source
cdn.growthbook.io	connect	view source
cdn.sanity.io	connect	view source
challenges.cloudflare.com	connect	view source
example.com	connect	view source
ffern-studio.typeform.com	connect	view source
hook.eu1.make.com	connect	view source
img.litix.io	connect	view source
js.chargebee.com	connect	view source
js.stripe.com	connect	view source
json-schema.org	connect	view source
purecatamphetamine.github.io	connect	view source
react.dev	connect	view source
s1077718.eu-fsn-3.betterstackdata.com	connect	view source
schema.org	connect	view source
stripe.com	connect	view source
tools.usps.com	connect	view source
uk.pinterest.com	connect	view source
uk.trustpilot.com	connect	view source
vjmwszsapkinaulmoukz.supabase.co	connect	view source
www.anpost.com	connect	view source
www.esquire.com	connect	view source
www.facebook.com	connect	view source
www.gstatic.com	connect	view source
www.instagram.com	connect	view source
www.mux.com	connect	view source
www.postnl.nl	connect	view source
www.royalmail.com	connect	view source
www.tiktok.com	connect	view source
www.trustpilot.com	connect	view source
www.vogue.co.uk	connect	view source
www.w3.org	connect	view source
www.youtube.com	connect	view source

Stored pages and scripts

The newest stored version of each file, newest first@if (p.FilesTruncated) { (the 500 newest of 321) }. 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://ffern.co/_next/static/immutable/chunks/0mog-oy8askum.js	js	985 B	2026-09-24	current
https://ffern.co/_next/static/immutable/chunks/3rte4u7ohyppn.js	js	988 B	2026-09-24	current
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https://ffern.co/_next/static/immutable/chunks/2iifaxe_i-fd0.js	js	651 B	2026-09-24	current
https://ffern.co/_next/static/immutable/chunks/2mp5pwnu2v6qb.js	js	973 B	2026-09-24	current
https://ffern.co/_next/static/immutable/chunks/3w31hmq_jm9jm.js	js	970 B	2026-09-24	current
https://ffern.co/_next/static/immutable/chunks/turbopack-0tee-6a16113s.js	js	11.6 KB	2026-09-24	current
https://ffern.co/_next/static/immutable/chunks/2ddm0u4k_w-yj.js	js	43.8 KB	2026-09-24	current
https://ffern.co/_next/static/immutable/chunks/36ekqp1fdfdy1.js	js	35.5 KB	2026-09-24	current
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https://ffern.co/_next/static/immutable/chunks/2e9xmyk7nzv_s.js	js	27.2 KB	2026-09-24	current
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https://ffern.co/_next/static/immutable/chunks/turbopack-1m4onglroesr5.js	js	11.3 KB	2026-09-24	current
https://ffern.co/_next/static/immutable/chunks/186vxxvtkql-_.js	js	32.7 KB	2026-09-24	current
https://ffern.co/_next/static/immutable/chunks/0blwk2wmapwmv.js	js	49.7 KB	2026-09-24	current
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https://ffern.co/_next/static/immutable/chunks/0ipycp1ii-gav.js	js	103.6 KB	2026-09-24	current
https://ffern.co/_next/static/immutable/chunks/2i5xu00rd7wtr.js	js	30 KB	2026-09-24	current
https://ffern.co/_next/static/immutable/chunks/2-ys2tuqbc4mm.js	js	21.8 KB	2026-09-24	current
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https://ffern.co/_next/static/immutable/chunks/23gomnkhivar8.js	js	192.1 KB	2026-09-24	current
https://ffern.co/_next/static/immutable/chunks/3uc-lphrp7qq0.js	js	2 KB	2026-09-24	current
https://ffern.co/seasons/autumn-26	html	542.6 KB	2026-09-24	current

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, 184 files, 6.6 MB; 39 libraries, 1 identifier, 34 third-party hosts
39 libraries added
- @maveio/components 0.0.192
- @mux/mux-player 3.13.4
- cobrowse-sdk-js 3.28.7
- @miso.ai/client-sdk 1.13.1
- @marimo-team/frontend 0.25.0
- @zappway/embeds 2.0.28
- @feathery/react 2.98.1
- libphonenumber-js 1.13.14
- @ant-design/x 2.9.0
- @inkeep/cxkit-js 0.5.119
- @clerk/ui 1.34.0
- @moveo-ai/web-client 0.117.0
- and 27 more
1 identifier added
- oe7jqQsNDV4yIEZBEYB5dHGJyVXcHcpOueKXci8nAQs Google site verification
34 third-party hosts added
- www.w3.org
- img.litix.io
- aomedia.org
- www.gstatic.com
- www.mux.com
- www.vogue.co.uk
- www.esquire.com
- uk.trustpilot.com
- www.trustpilot.com
- www.facebook.com
- schema.org
- www.instagram.com
- and 22 more
184 files added

Questions about ffern.co

How does PageSourceSearch know what ffern.co 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 ffern.co 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 ffern.co?: 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 ffern.co?: 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.