How does PageSourceSearch know what levelfour.ai 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 levelfour.ai 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 levelfour.ai?

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 levelfour.ai?

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

levelfour.ai

Built with @clerk/ui 1.34.0, gather-vue 8.20.3, @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, @constructor-io/constructorio-ui-autocomplete 1.30.1, gridstack 14.0.0, @sentry-internal/replay 10.57.0, hubspot and more. 5 pages and 118 stored files, last crawled 2026-10-03.

rank 1,898,728 32 libraries 2 identifiers 38 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	2026-10-03
gather-vue	8.20.3	2026-10-03
@blotoutio/providers-blotout-consent-sdk	1.73.0	2026-10-03
dashjs	5.2.1	2026-10-03
@marimo-team/frontend	0.25.0	2026-10-03
@reachfive/identity-core	1.42.0	2026-10-03
@reachfive/identity-ui	2.1.0	2026-10-03
jspdf	4.2.1	2026-10-03
@constructor-io/constructorio-ui-autocomplete	1.30.1	2026-10-03
gridstack	14.0.0	2026-10-03
@sentry-internal/replay	10.57.0	2026-10-03
hubspot		2026-10-03
@desivocal/agents-cdn	1.0.21	2026-10-03
@alfatech/livechat	2026.9.0-9.2	2026-10-03
@recogito/annotorious	2.7.14	2026-10-03
@developerportalsg/docsify-sidebar-collapse	2.2.0	2026-10-03
@bikematrix/web-components	1.3.23	2026-10-03
dayschedule-widget	1.2.8	2026-10-03
@ant-design/x	2.9.0	2026-10-03
@prefecthq/prefab-ui	0.20.2	2026-10-03
@etchteam/recycling-locator	1.78.1	2026-10-03
@wavoip/wavoip-webphone	1.9.1	2026-10-03
@myparcel-dev/delivery-options	7.5.3	2026-10-03
@inkeep/agents-ui-js-cloud	0.17.8	2026-10-03
@waniwani/sdk	0.21.3	2026-10-03
ai-chatbot-widget	0.1.6	2026-10-03
alist-web	3.55.0	2026-10-03
@pydantic/ai-chat-ui	2.3.0	2026-10-03
d3	19.3.0-canary-3f0b9e61-20260317	2026-09-25
@moveo-ai/web-client	0.117.0	2026-09-25
@joyfill/components	4.0.0-rc26	2026-09-25
@zappway/embeds	2.0.28	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
HubSpot portal id (HubSpot)	50590792	view source
Sentry DSN host (Sentry)	o4511337508044800.ingest.us.sentry.io	view source

Third-party hosts

Hosts outside levelfour.ai 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
acme.atlassian.net	connect	view source
api.novu.co	connect	view source
backend.assistant-api.com	connect	view source
broken.example.com	connect	view source
cdn.mxpnl.com	connect	view source
cf-templates-1bsphth8u70q9-us-east-1.s3.amazonaws.com	connect	view source
claude.ai	connect	view source
connector-uploads.mock.s3.amazonaws.com	connect	view source
console.aws.amazon.com	connect	view source
creditas.atlassian.net	connect	view source
cursor.com	connect	view source
dashboard.levelfour.ai.attacker.example	connect	view source
dev.ws.novu.co	connect	view source
docs.github.com	connect	view source
docs.gitlab.com	connect	view source
eu.ws.novu.co	connect	view source
example.com	connect	view source
fonts.googleapis.com	stylesheet	view source
github.com	connect	view source
gitlab.com	connect	view source
go.novu.co	connect	view source
i.pravatar.cc	connect	view source
icon.icepanel.io	connect	view source
img.clerk.com	connect	view source
json-schema.org	connect	view source
levelfour.atlassian.net	connect	view source
levelfour.cal.com	connect	view source
linkedin.com	connect	view source
mcp-tools.example.com	connect	view source
react.dev	connect	view source
sentry.io	connect	view source
sunnysystems.com.br	connect	view source
support.atlassian.com	connect	view source
va.vercel-scripts.com	connect	view source
vercel.live	connect	view source
ws.novu.co	connect	view source
www.w3.org	connect	view source
your-app.com	connect	view source

Stored pages and scripts

The newest stored version of each file, newest first@if (p.FilesTruncated) { (the 500 newest of 118) }. 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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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.

2026-10-03 first crawl

5 pages, 63 files, 7.2 MB; 28 libraries, 2 identifiers, 38 third-party hosts
28 libraries added
- @sentry-internal/replay 10.57.0
- @inkeep/agents-ui-js-cloud 0.17.8
- @clerk/ui 1.34.0
- @ant-design/x 2.9.0
- jspdf 4.2.1
- @reachfive/identity-core 1.42.0
- @recogito/annotorious 2.7.14
- dashjs 5.2.1
- @reachfive/identity-ui 2.1.0
- @pydantic/ai-chat-ui 2.3.0
- ai-chatbot-widget 0.1.6
- @constructor-io/constructorio-ui-autocomplete 1.30.1
- and 16 more
2 identifiers added
- o4511337508044800.ingest.us.sentry.io Sentry DSN host
- 50590792 HubSpot portal id
38 third-party hosts added
- fonts.googleapis.com
- react.dev
- example.com
- www.w3.org
- vercel.live
- cdn.mxpnl.com
- va.vercel-scripts.com
- sunnysystems.com.br
- levelfour.cal.com
- icon.icepanel.io
- github.com
- linkedin.com
- and 26 more
63 files added

Questions about levelfour.ai

How does PageSourceSearch know what levelfour.ai 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 levelfour.ai 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 levelfour.ai?: 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 levelfour.ai?: 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.