How does PageSourceSearch know what fka.is 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 fka.is 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 fka.is?

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 fka.is?

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

fka.is

Built with gtm, @clerk/ui 1.34.0, instantsearch.js 4.118.0, lottie-web 5.13.0, add-to-calendar-button 3.1.2, dashjs 5.2.1, @feathery/react 2.96.0, @reachfive/identity-core 1.42.0, @reachfive/identity-ui 2.1.0, jspdf 4.2.1, @cognigy/webchat 3.50.0, paulirish/lite-youtube-embed and more. 5 pages and 202 stored files, last crawled 2026-10-02.

rank 880,092 33 libraries 1 identifier 55 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
instantsearch.js	4.118.0	2026-10-02
lottie-web	5.13.0	2026-10-02
add-to-calendar-button	3.1.2	2026-10-02
dashjs	5.2.1	2026-10-02
@feathery/react	2.96.0	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
@cognigy/webchat	3.50.0	2026-10-02
paulirish/lite-youtube-embed		2026-10-02
joi	18.2.9	2026-10-02
webex	3.12.0	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
@gstat/leaflet-gesture-handling	1.2.8	2026-10-02
@betterbugs/web-sdk	0.0.47	2026-10-02
@builder.io/webcomponents	2.0.2	2026-10-02
@pdftron/pdfjs-express-viewer	8.7.5	2026-10-02
@memori.ai/memori-webcomponent	8.3.3	2026-10-02
@perceptimagery/dita-configurator	1.3.24	2026-10-02
@stytch/vanilla-js	6.3.0	2026-10-02
wonder-image	2.1.2-alpha.4	2026-10-02
@story-telling-reporter/react-embed-code-generator	2.2.20	2026-10-02
jupyter-leaflet	0.20.0	2026-10-02
@solace-health/solace-entry-widget	2.0.5	2026-10-02
@wix/design-system	1.328.0	2026-09-25
froala-editor	5.4.0	2026-09-25
algoliasearch.zendesk-hc	3.0.0	2026-09-25
@lottiefiles/lottie-player	2.0.12	2026-09-25

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 Tag Manager container (Google)	GTM-NLTVQRKV	view source

Third-party hosts

Hosts outside fka.is 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
add-to-calendar-pro.com	connect	view source
analytics.google.com	connect	view source
api.add-to-calendar-pro.com	connect	view source
api.dkplus.is	connect	view source
api.dmcdn.net	connect	view source
calendar.google.com	connect	view source
calendar.yahoo.com	connect	view source
cdn.embed.ly	connect	view source
cdn.jsdelivr.net	connect	view source
cdnjs.cloudflare.com	connect	view source
chatbot-api.menni.ai	connect	view source
connect.facebook.net	connect	view source
dev.caldn.net	connect	view source
developers.google.com	connect	view source
docs.google.com	connect	view source
event-dev.caldn.net	connect	view source
event.caldn.net	connect	view source
fast.wistia.com	connect	view source
fonts.googleapis.com	connect	view source
github.com	connect	view source
go.caldn.net	connect	view source
img.youtube.com	connect	view source
innskraning.island.is	connect	view source
leafletjs.com	connect	view source
maps.googleapis.com	connect	view source
noembed.com	connect	view source
noona.is	connect	view source
outlook.live.com	connect	view source
outlook.office.com	connect	view source
placekitten.com	connect	view source
play.vidyard.com	connect	view source
player.twitch.tv	connect	view source
player.vimeo.com	connect	view source
reactjs.org	connect	view source
s3.vist.is	connect	view source
schema.org	connect	view source
streamable.com	connect	view source
teams.microsoft.com	connect	view source
twitter.com	connect	view source
vercel.live	connect	view source
videodelivery.net	connect	view source
vimeo.com	connect	view source
w.soundcloud.com	connect	view source
widget.mixcloud.com	connect	view source
www.algolia.com	connect	view source
www.facebook.com	connect	view source
www.google.com	connect	view source
www.googletagmanager.com	iframe connect	view source
www.linkedin.com	connect	view source
www.mixcloud.com	connect	view source
www.openstreetmap.org	connect	view source
www.w3.org	connect	view source
www.yahoo.com	connect	view source
www.youtube-nocookie.com	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 202) }. 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.jsdelivr.net/gh/paulirish/lite-youtu…/src/lite-yt-embed.js	js library	not fetched	2026-10-02	current
https://www.fka.is/_next/static/chunks/9972.77ae2e2b7d711832.js	js	782 B	2026-10-02	current
https://www.googletagmanager.com/gtm.js	js library	not fetched	2026-10-02	current
https://www.fka.is/_next/static/chunks/9966.787edcf6eb5978e9.js	js	704 B	2026-10-02	current
https://www.fka.is/_next/static/chunks/9953.e9e2740fbce80d36.js	js	1.2 KB	2026-10-02	current
https://www.fka.is/_next/static/chunks/9944.75750a5a35ffbfb2.js	js	1.3 KB	2026-10-02	current
https://www.fka.is/_next/static/chunks/9809.ac2ace3259a1577c.js	js	7.3 KB	2026-10-02	current
https://www.fka.is/_next/static/chunks/9611.abb438fc8b65bfa6.js	js	3.6 KB	2026-10-02	current
https://www.fka.is/_next/static/chunks/9597.698fe67a65d71af7.js	js	1.7 KB	2026-10-02	current
https://www.fka.is/_next/static/chunks/9514.a41825e3b642fffd.js	js	49.9 KB	2026-10-02	current
https://www.fka.is/_next/static/chunks/9553.17047d4e97748353.js	js	738 B	2026-10-02	current
https://www.fka.is/_next/static/chunks/9356.5cab02cd7e85a9c0.js	js	2.7 KB	2026-10-02	current
https://www.fka.is/_next/static/chunks/9362.fe66bb66602d869a.js	js	1.4 KB	2026-10-02	current
https://www.fka.is/_next/static/chunks/9215.ee231111bb7091eb.js	js	1.4 KB	2026-10-02	current
https://www.fka.is/_next/static/chunks/9112.448f5de56b4e565b.js	js	486 B	2026-10-02	current
https://www.fka.is/_next/static/chunks/8986.36d1bc295697bf98.js	js	2.1 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, 7.5 MB; 29 libraries, 1 identifier, 55 third-party hosts
29 libraries added
- gtm
- 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
- @story-telling-reporter/react-embed-code-generator 2.2.20
- @betterbugs/web-sdk 0.0.47
- joi 18.2.9
- and 17 more
1 identifier added
- GTM-NLTVQRKV Google Tag Manager container
56 third-party hosts added
- www.googletagmanager.com
- github.com
- vercel.live
- reactjs.org
- www.w3.org
- vimeo.com
- img.youtube.com
- developers.google.com
- www.google.com
- www.googletagmanager.com
- www.algolia.com
- calendar.google.com
- and 44 more
202 files added

Questions about fka.is

How does PageSourceSearch know what fka.is 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 fka.is 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 fka.is?: 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 fka.is?: 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.