How does PageSourceSearch know what perko.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 perko.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 perko.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 perko.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

perko.dev

Built with mealz-components 3.2.8, gtag, angular 21.1.0, @veltdev/sdk 6.0.14, twikoo 2.0.9, molstar 5.11.0, @getopenpay/openpay-js 0.5.25, @searchstax-inc/searchstudio-ux-js 4.2.50, @everymatrix/player-profile-dashboard 1.21.0, @formbird/angular-elements 8.5.10, @gradio/lite 5.45.0, dealposbooks 6.29.4 and more. 4 pages and 93 stored files, last crawled 2026-10-07.

rank 13,038,795 14 libraries 1 identifier 73 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
mealz-components	3.2.8	2026-10-07
gtag		2026-10-07
angular	21.1.0	2026-10-07
@veltdev/sdk	6.0.14	2026-10-07
twikoo	2.0.9	2026-10-07
molstar	5.11.0	2026-10-07
@getopenpay/openpay-js	0.5.25	2026-10-07
@searchstax-inc/searchstudio-ux-js	4.2.50	2026-10-07
@everymatrix/player-profile-dashboard	1.21.0	2026-10-07
@formbird/angular-elements	8.5.10	2026-10-07
@gradio/lite	5.45.0	2026-10-07
dealposbooks	6.29.4	2026-10-07
snyk	1.1307.4	2026-10-07
@chainlink/cl-search-frontend	0.13.2	2026-10-07

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-LCGQJ46269	view source

Third-party hosts

Hosts outside perko.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
angular.dev	connect	view source
angular.io	connect	view source
angularcommunity.net	connect	view source
antigravity.google	connect	view source
blairmeeks.com	connect	view source
browsersync.io	connect	view source
chrisperko.net	connect	view source
christynewrites.com	connect	view source
codepen.io	connect	view source
dev.fitbit.com	connect	view source
developer.wordpress.org	connect	view source
devfestslc.web.app	connect	view source
dimpleindustries.com	connect	view source
docs.angularjs.org	connect	view source
docs.github.com	connect	view source
docs.google.com	connect	view source
expatactually.com	connect	view source
firebase.google.com	connect	view source
fonts.googleapis.com	stylesheet	view source
forge.laravel.com	connect	view source
gallery.fitbit.com	connect	view source
gdg.community.dev	connect	view source
github.com	connect	view source
jigsaw.tighten.co	connect	view source
js.devexpress.com	connect	view source
kellysundberg.com	connect	view source
kiss-sucks.com	connect	view source
laracasts.com	connect	view source
laragon.org	connect	view source
laravel.com	connect	view source
material.angular.io	connect	view source
medium.com	connect	view source
mysite.com	connect	view source
netbasal.com	connect	view source
next.material.angular.io	connect	view source
ngrx.io	connect	view source
oxygenbuilder.com	connect	view source
redpapayablog.com	connect	view source
roots.io	connect	view source
rxjs-dev.firebaseapp.com	connect	view source
rxjs.dev	connect	view source
schemas.wp.org	connect	view source
scully.io	connect	view source
seedpro-dv.corteva.com	connect	view source
slaton-rivera.com	connect	view source
southernvisiondevelopment.com	connect	view source
stackblitz.com	connect	view source
stackoverflow.com	connect	view source
tailwindcss.com	connect	view source
tailwindui.com	connect	view source
themeisle.com	connect	view source
transaction-action.com	connect	view source
twitter.com	connect	view source
underscores.me	connect	view source
wigginit.shop	connect	view source
wildairtravel.com	connect	view source
wordpress.org	connect	view source
wp-cli.org	connect	view source
www.canva.com	connect	view source
www.devexpress.com	connect	view source
www.digitalocean.com	connect	view source
www.discogs.com	connect	view source
www.facebook.com	connect	view source
www.fullstackradio.com	connect	view source
www.googletagmanager.com	script	view source
www.heropatterns.com	connect	view source
www.kissrocks.com	connect	view source
www.linkedin.com	connect	view source
www.nerdcontinuity.com	connect	view source
www.netlify.com	connect	view source
www.npmjs.com	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 93) }. 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://perko.dev/assets/intro-to-ngrx-signal-store-DUspb4Fm.js	js	75.1 KB	2026-10-07	2026-10-07
https://www.googletagmanager.com/gtag/js?id=G-LCGQJ46269	js library	not fetched	2026-10-07	2026-10-07
https://perko.dev/assets/2026-05-05-45-minutes-t…r-app-with-firebase-CRPPxm-e.js	js	859 B	2026-10-07	2026-10-07
https://perko.dev/assets/2026-09-19-building-ang…me-builder-workshop-CBbvzyfO.js	js	478 B	2026-10-07	2026-10-07
https://perko.dev/assets/2026-04-11-50-minutes-t…r-app-with-firebase-Cud3CJ_U.js	js	1.5 KB	2026-10-07	2026-10-07
https://perko.dev/assets/2025-10-11-signals-your…rn-state-management-DoNv1yKo.js	js	1.1 KB	2026-10-07	2026-10-07
https://perko.dev/assets/2025-10-31-level-up-you…h-ngrx-signal-store-eBPh5SyQ.js	js	1.4 KB	2026-10-07	2026-10-07
https://perko.dev/assets/2025-03-11-state-manage…ith-angular-signals-CbZ4TCFO.js	js	1.7 KB	2026-10-07	2026-10-07
https://perko.dev/assets/2024-11-19-signals-unle…o-ngrx-signal-store-DC1-LrC5.js	js	1.4 KB	2026-10-07	2026-10-07
https://perko.dev/assets/2024-09-28-state-manage…ith-angular-signals-p5Y1xoSu.js	js	1.7 KB	2026-10-07	2026-10-07
https://perko.dev/assets/2024-10-31-exorcising-s…res-angular-signals-BG5c6Nni.js	js	1.8 KB	2026-10-07	2026-10-07
https://perko.dev/assets/2024-09-21-signals-unle…o-ngrx-signal-store-CD2AxELU.js	js	1.4 KB	2026-10-07	2026-10-07
https://perko.dev/assets/2023-10-25-declarative-witchcraft-CeDLhMXy.js	js	1.2 KB	2026-10-07	2026-10-07
https://perko.dev/assets/2023-10-14-custom-rxjs-operators-talk-CdkfNpd1.js	js	1.1 KB	2026-10-07	2026-10-07
https://perko.dev/assets/2023-10-14-brewing-angular-signal-potions-Dv1J0fzh.js	js	1.3 KB	2026-10-07	2026-10-07
https://perko.dev/assets/2023-06-13-custom-rxjs-operators-talk-DAvoY38V.js	js	1.1 KB	2026-10-07	2026-10-07
https://perko.dev/assets/2022-07-12-building-con…s-in-reactive-forms-Du3ttdO1.js	js	35.7 KB	2026-10-07	2026-10-07
https://perko.dev/assets/tab-group-exporter-wdoaakVi.js	js	974 B	2026-10-07	2026-10-07
https://perko.dev/assets/2026-07-07-streaming-re…and-angular-signals-BwnfXmty.js	js	33.2 KB	2026-10-07	2026-10-07
https://perko.dev/assets/tab-group-exporter-BcUWXYqF.js	js	2.6 KB	2026-10-07	2026-10-07
https://perko.dev/assets/2026-06-26-migrating-to-signal-forms-BjHL--wO.js	js	19.3 KB	2026-10-07	2026-10-07
https://perko.dev/assets/2025-02-19-thinking-reactively-with-signals-B1t4jk9S.js	js	14.4 KB	2026-10-07	2026-10-07
https://perko.dev/assets/2024-11-11-simple-angul…erial-customization-C1VnajlQ.js	js	5.4 KB	2026-10-07	2026-10-07
https://perko.dev/assets/2023-08-31-quickly-setu…indows-with-laragon-c3Todkwb.js	js	3 KB	2026-10-07	2026-10-07
https://perko.dev/assets/2023-07-19-reactively-r…grx-component-store-BNXVGxek.js	js	36.3 KB	2026-10-07	2026-10-07
https://perko.dev/assets/2023-06-30-the-overlook…r-16-signal-effects-BNjqv-vz.js	js	16.2 KB	2026-10-07	2026-10-07
https://perko.dev/assets/2023-03-07-angular-pipes-pure-vs-impure-DIjZvX4b.js	js	9.5 KB	2026-10-07	2026-10-07
https://perko.dev/assets/2023-01-30-merging-two-…-of-different-types-BrqdySPS.js	js	17 KB	2026-10-07	2026-10-07
https://perko.dev/assets/2022-11-22-easy-elevati…th-angular-material-Ds2HHtsw.js	js	4.8 KB	2026-10-07	2026-10-07
https://perko.dev/assets/2022-11-18-website-spee…nd-ngOptimizedImage-Ess2e109.js	js	5.2 KB	2026-10-07	2026-10-07
https://perko.dev/assets/2022-11-04-no-value-acc…ng-angular-material-B2mlqxj5.js	js	1.8 KB	2026-10-07	2026-10-07
https://perko.dev/assets/2022-05-06-handle-async…with-boolean-result-Ck__Vuhw.js	js	17.9 KB	2026-10-07	2026-10-07
https://perko.dev/assets/2022-02-21-understandin…utenberg-saves-data-CNcJEy0P.js	js	19.3 KB	2026-10-07	2026-10-07
https://perko.dev/assets/2021-12-29-use-specific-ssh-keys-for-github-CPMfySW3.js	js	2.7 KB	2026-10-07	2026-10-07
https://perko.dev/assets/2021-09-14-authorize-dotnet-api-with-jwt-DUKkoIJw.js	js	8.8 KB	2026-10-07	2026-10-07
https://perko.dev/assets/2020-11-10-fitbit-roni-1.9-released-BSuFntkQ.js	js	2.1 KB	2026-10-07	2026-10-07
https://perko.dev/assets/2020-06-23-creating-a-static-angular-blog-B6b6NyoL.js	js	9.3 KB	2026-10-07	2026-10-07
https://perko.dev/assets/2020-08-12-upgrading-my-site-with-scully-BiKs2odb.js	js	11.3 KB	2026-10-07	2026-10-07
https://perko.dev/assets/2019-08-14-changing-the…n-a-devExpress-grid-KITqUkAq.js	js	3 KB	2026-10-07	2026-10-07
https://perko.dev/assets/2019-03-25-angular-deve…-nonrequired-fields-BMtevwhO.js	js	7.8 KB	2026-10-07	2026-10-07
https://perko.dev/assets/2019-03-24-setting-up-a…th-nginx-and-wp-cli-7XOusi5t.js	js	11.6 KB	2026-10-07	2026-10-07
https://perko.dev/assets/2019-03-16-creating-an-…pe-in-oxygenbuilder-394zUloo.js	js	2.1 KB	2026-10-07	2026-10-07
https://perko.dev/assets/2018-12-31-my-2018-year-end-review-BM5bs-Yj.js	js	3.6 KB	2026-10-07	2026-10-07
https://perko.dev/assets/2019-02-15-angualrjs-ng…e-elements-from-dom-CYelg4uD.js	js	3 KB	2026-10-07	2026-10-07
https://perko.dev/assets/2018-08-24-fitbit-cli-e…-higgs-applications-B9g1n3p_.js	js	2 KB	2026-10-07	2026-10-07
https://perko.dev/assets/2018-07-16-high-accuracy-gps-with-esri-DTMtDf-r.js	js	5.1 KB	2026-10-07	2026-10-07
https://perko.dev/assets/2018-06-14-fitbit-devel…-warning-icon-issue-D_DhJupG.js	js	3.7 KB	2026-10-07	2026-10-07
https://perko.dev/assets/2018-03-22-choosing-a-s…derscores-sage-awps-Df1vwNGW.js	js	5.9 KB	2026-10-07	2026-10-07
https://perko.dev/assets/2018-02-14-995-kiss-suc…laravel-application-DP89xAgG.js	js	2.7 KB	2026-10-07	2026-10-07
https://perko.dev/assets/2018-01-25-multiple-css…-vs-transformations-cAsnmKaF.js	js	2 KB	2026-10-07	2026-10-07
https://perko.dev/assets/2017-12-26-my-2017-year-end-review-Cw_D0blA.js	js	5.2 KB	2026-10-07	2026-10-07
https://perko.dev/assets/2017-11-17-tailwindcss-my-grumpy-views-CbsX3vLU.js	js	4.3 KB	2026-10-07	2026-10-07
https://perko.dev/assets/2017-11-22-tailwindcss-…ts-workflow-process-aZm8fQVE.js	js	51.5 KB	2026-10-07	2026-10-07
https://perko.dev/assets/2017-10-14-free-hero-patterns-CAPQt-VM.js	js	1.2 KB	2026-10-07	2026-10-07
https://perko.dev/assets/2017-10-05-launching-my-first-laravel-saas-B6xZi---.js	js	3.3 KB	2026-10-07	2026-10-07
https://perko.dev/assets/2017-09-01-initializing…lers-ngif-vs-ngshow-4RR8y05l.js	js	1.5 KB	2026-10-07	2026-10-07
https://perko.dev/assets/2017-07-31-elistings-real-estate-service-BbGvocdm.js	js	1.6 KB	2026-10-07	2026-10-07
https://perko.dev/assets/2017-07-07-angularjs-un…-provider-eprovider-GTYyCO2l.js	js	4.7 KB	2026-10-07	2026-10-07
https://perko.dev/assets/2017-04-23-singleton-services-in-angular-DrnJ93Us.js	js	4.4 KB	2026-10-07	2026-10-07
https://perko.dev/assets/2017-01-14-browsersync-…nt-work-whats-wrong-jdTJ_dui.js	js	7.8 KB	2026-10-07	2026-10-07
https://perko.dev/assets/2016-12-26-reflection-and-resolution-CChCIaPp.js	js	2.8 KB	2026-10-07	2026-10-07
https://perko.dev/assets/wildairtravel-NkqN43-I.js	js	203 B	2026-10-07	2026-10-07
https://perko.dev/assets/wigginit-D7j6MZdi.js	js	313 B	2026-10-07	2026-10-07
https://perko.dev/assets/southernvisiondevelopment-BQxYU2tE.js	js	400 B	2026-10-07	2026-10-07
https://perko.dev/assets/transactionaction-B9XToHCW.js	js	237 B	2026-10-07	2026-10-07
https://perko.dev/assets/slaton-rivera-BiiW4sgg.js	js	348 B	2026-10-07	2026-10-07
https://perko.dev/assets/redpapayablog-BPLG2Ihm.js	js	417 B	2026-10-07	2026-10-07
https://perko.dev/assets/owltoreed-CzeX-UWd.js	js	192 B	2026-10-07	2026-10-07
https://perko.dev/assets/kickoffwp-USZbULS8.js	js	315 B	2026-10-07	2026-10-07
https://perko.dev/assets/kellysundberg-omsdzTGT.js	js	220 B	2026-10-07	2026-10-07
https://perko.dev/assets/expatactually-BY9f2-WQ.js	js	371 B	2026-10-07	2026-10-07
https://perko.dev/assets/elistings-DHzOfMIq.js	js	251 B	2026-10-07	2026-10-07
https://perko.dev/assets/christynewrites-D6m8oXqM.js	js	327 B	2026-10-07	2026-10-07
https://perko.dev/assets/dimpleindustries-D1_0h9jA.js	js	370 B	2026-10-07	2026-10-07
https://perko.dev/assets/buybyelease-CRYYsVKv.js	js	330 B	2026-10-07	2026-10-07
https://perko.dev/assets/blairmeeks-CmfMNI0h.js	js	314 B	2026-10-07	2026-10-07
https://perko.dev/assets/30secondtour-Cch9JkiS.js	js	227 B	2026-10-07	2026-10-07
https://perko.dev/assets/workshops.page-D4WrcM_y.js	js	1.7 KB	2026-10-07	2026-10-07
https://perko.dev/assets/workshops._slug_.page-BoWx_22b.js	js	1 KB	2026-10-07	2026-10-07
https://perko.dev/assets/talks.page-BFN_C39E.js	js	2.7 KB	2026-10-07	2026-10-07
https://perko.dev/assets/talks._slug_.page-wqP-lbCd.js	js	1.1 KB	2026-10-07	2026-10-07
https://perko.dev/assets/projects.page-pUOa7BYt.js	js	2.3 KB	2026-10-07	2026-10-07
https://perko.dev/assets/projects._slug_.privacy.page-j0UkwPAj.js	js	1.3 KB	2026-10-07	2026-10-07
https://perko.dev/assets/projects._slug_.page-CHBTHhKI.js	js	1.7 KB	2026-10-07	2026-10-07
https://perko.dev/assets/portfolio.page-ydLpgh_U.js	js	1 KB	2026-10-07	2026-10-07
https://perko.dev/assets/blog.post._slug_.page-DMPASCUt.js	js	1.6 KB	2026-10-07	2026-10-07
https://perko.dev/assets/blog.page-B2FaU3e3.js	js	1.9 KB	2026-10-07	2026-10-07
https://perko.dev/assets/(home).page-BVAmUpLX.js	js	64.8 KB	2026-10-07	2026-10-07
https://perko.dev/assets/index-CRYR9ZgG.js	js	677 KB	2026-10-07	2026-10-07
https://perko.dev/workshops/	html	56.7 KB	2026-10-07	2026-10-07
https://perko.dev/talks/	html	87.6 KB	2026-10-07	2026-10-07
https://perko.dev/blog/	html	138.7 KB	2026-10-07	2026-10-07
https://perko.dev/	html	66.3 KB	2026-10-07	2026-10-07

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.

2026-10-07 first crawl

4 pages, 93 files, 1.6 MB; 14 libraries, 1 identifier, 73 third-party hosts
14 libraries added
- gtag
- molstar 5.11.0
- @getopenpay/openpay-js 0.5.25
- mealz-components 3.2.8
- @veltdev/sdk 6.0.14
- dealposbooks 6.29.4
- @formbird/angular-elements 8.5.10
- snyk 1.1307.4
- @searchstax-inc/searchstudio-ux-js 4.2.50
- @gradio/lite 5.45.0
- @chainlink/cl-search-frontend 0.13.2
- twikoo 2.0.9
- and 2 more
1 identifier added
- G-LCGQJ46269 Google Analytics 4 measurement id
73 third-party hosts added
- www.googletagmanager.com
- fonts.googleapis.com
- angular.dev
- www.w3.org
- twitter.com
- www.linkedin.com
- blairmeeks.com
- christynewrites.com
- dimpleindustries.com
- expatactually.com
- kellysundberg.com
- redpapayablog.com
- and 61 more
93 files added

Questions about perko.dev

How does PageSourceSearch know what perko.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 perko.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 perko.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 perko.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.