How does PageSourceSearch know what letter.so 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 letter.so 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 letter.so?

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 letter.so?

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

letter.so

Built with jquery 4.0.0, webpack, @clerk/ui 1.34.0, @zonos/elements 1.3.289, lottie-web 5.13.0, browser-image-compression 2.0.2, cloudinary-video-player 4.1.2, addsearch-search-ui 0.10.9, dashjs 5.2.1, @marimo-team/frontend 0.25.0, @reachfive/identity-core 1.42.0, @reachfive/identity-ui 2.1.0 and more. 5 pages and 200 stored files, last crawled 2026-10-02.

rank 1,119,368 55 libraries 2 identifiers 41 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
jquery	4.0.0	2026-10-02
webpack		2026-10-02
@clerk/ui	1.34.0	2026-10-02
@zonos/elements	1.3.289	2026-10-02
lottie-web	5.13.0	2026-10-02
browser-image-compression	2.0.2	2026-10-02
cloudinary-video-player	4.1.2	2026-10-02
addsearch-search-ui	0.10.9	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
kore-web-sdk	11.28.1	2026-10-02
oidc-client	1.11.5	2026-10-02
@codesandbox/sandpack-client	2.19.8	2026-10-02
@bridgeline-digital/hawksearch-handlebars-ui	7.0.2	2026-10-02
@tonconnect/ui	3.0.2	2026-10-02
exceljs	4.4.0	2026-10-02
@widgetbot/crate	3.9.1	2026-10-02
js-beautify	2.0.3	2026-10-02
@scalar/api-reference	1.71.0	2026-10-02
@moveo-ai/web-client	0.119.0	2026-10-02
@jupyter-widgets/html-manager	1.0.15	2026-10-02
@tolgee/web	7.2.1	2026-10-02
spirhal	4.5.0	2026-10-02
webex	3.12.0	2026-10-02
artplayer-plugin-vast	1.0.0	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
webcrypto	0.1.1	2026-10-02
javascript-obfuscator	5.8.0	2026-10-02
franken-ui	2.1.2	2026-10-02
stackedboost-shopify-assets	0.2.0	2026-10-02
unique-names-generator	4.7.1	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
@stytch/vanilla-js	6.3.0	2026-10-02
@tsocial/tvweb-sdk	5.38.6	2026-10-02
phaser3-rex-plugins	1.80.20	2026-10-02
jquery-storelocator-plugin	3.4.0	2026-10-02
@inkeep/agents-ui-js-cloud	0.17.8	2026-10-02
@formbird/angular-elements	8.5.10	2026-10-02
wonder-image	2.1.2-alpha.4	2026-10-02
@joyfill/components	4.0.0-rc26	2026-10-02
dealposbooks	6.29.4	2026-10-02
machinelearn	2.1.5	2026-10-02
@limetech/lime-elements	40.5.1	2026-10-02
@chativa/connector-directline	0.15.0	2026-10-02
coherentpdf	2.5.5	2026-10-02

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
Crisp website id (Crisp)	23e4bd2a-9d5e-46b0-ba3b-9e59af6cb637	view source
Plausible data-domain (Plausible)	letter.so	view source

Third-party hosts

Hosts outside letter.so 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
analytics.prototypr.io	script	view source
api.hubapi.com	connect	view source
app.hubspot.com	connect	view source
app.olvy.co	script	view source
aws.amazon.com	connect	view source
axios-http.com	connect	view source
blog.duolingo.com	connect	view source
cdn.jsdelivr.net	connect	view source
codepen.io	connect	view source
cors.feedbagel.com	connect	view source
cors.prototypr.dev	connect	view source
example.com	connect	view source
facebook.com	connect	view source
fast.wistia.com	script	view source
fonts.googleapis.com	stylesheet	view source
github.com	connect	view source
google.com	connect	view source
images.unsplash.com	connect	view source
instagram.com	connect	view source
json-schema.org	connect	view source
letter-so.s3.amazonaws.com	connect	view source
letter-so.s3.us	connect	view source
letter-so.s3.us-west-1.amazonaws.com	connect	view source
linkedin.com	connect	view source
mc.sendgrid.com	connect	view source
picsum.photos	connect	view source
prototypr.io	connect	view source
react.dev	connect	view source
req.prototypr.io	connect	view source
s3-us-west-1.amazonaws.com	connect	view source
sendgrid.com	connect	view source
static-cdn.unicornplatform.com	script stylesheet	view source
tinify-bucket.s3-us-west-1.amazonaws.com	connect	view source
twitter.com	connect	view source
ucarecdn.com	connect	view source
upload.wikimedia.org	connect	view source
www.nytimes.com	connect	view source
www.producthunt.com	connect	view source
www.royalacademy.org.uk	connect	view source
www.w3.org	connect	view source
www.youtube.com	iframe	view source

Stored pages and scripts

The newest stored version of each file, newest first@if (p.FilesTruncated) { (the 500 newest of 200) }. 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://app.letter.so/js/script.exclusions.file-…local.outbound-links.revenue.js	js	2.7 KB	2026-10-02	2026-10-02
https://app.letter.so/js/script.exclusions.file-…utbound-links.pageview-props.js	js	2.7 KB	2026-10-02	2026-10-02
https://app.letter.so/js/script.exclusions.file-…links.pageview-props.revenue.js	js	2.7 KB	2026-10-02	2026-10-02
https://app.letter.so/js/script.exclusions.file-…utbound-links.pageview-props.js	js	2.8 KB	2026-10-02	2026-10-02
https://app.letter.so/js/script.exclusions.file-…links.pageview-props.revenue.js	js	2.8 KB	2026-10-02	2026-10-02
https://app.letter.so/js/script.exclusions.file-…outbound-links.tagged-events.js	js	3.5 KB	2026-10-02	2026-10-02
https://app.letter.so/js/script.exclusions.file-…-links.revenue.tagged-events.js	js	3.7 KB	2026-10-02	2026-10-02
https://app.letter.so/js/script.exclusions.file-…pageview-props.tagged-events.js	js	3.7 KB	2026-10-02	2026-10-02
https://app.letter.so/js/script.exclusions.file-…-links.revenue.tagged-events.js	js	3.8 KB	2026-10-02	2026-10-02
https://app.letter.so/js/script.exclusions.file-…-props.revenue.tagged-events.js	js	3.9 KB	2026-10-02	2026-10-02
https://app.letter.so/js/script.exclusions.file-…-props.revenue.tagged-events.js	js	4 KB	2026-10-02	2026-10-02
https://app.letter.so/js/script.exclusions.file-…pageview-props.tagged-events.js	js	3.8 KB	2026-10-02	2026-10-02
https://app.letter.so/js/script.exclusions.file-…outbound-links.tagged-events.js	js	3.6 KB	2026-10-02	2026-10-02
https://app.letter.so/js/script.exclusions.file-…wnloads.local.outbound-links.js	js	2.6 KB	2026-10-02	2026-10-02
https://app.letter.so/js/script.exclusions.hash.local.manual.js	js	1.1 KB	2026-10-02	2026-10-02
https://app.letter.so/js/script.exclusions.local.outbound-links.js	js	2.2 KB	2026-10-02	2026-10-02
https://app.letter.so/js/script.exclusions.hash.local.manual.revenue.js	js	1.2 KB	2026-10-02	2026-10-02
https://app.letter.so/js/script.exclusions.local.manual.revenue.js	js	1.1 KB	2026-10-02	2026-10-02
https://app.letter.so/js/script.exclusions.hash.local.manual.pageview-props.js	js	1.3 KB	2026-10-02	2026-10-02
https://app.letter.so/js/script.exclusions.hash.…anual.pageview-props.revenue.js	js	1.3 KB	2026-10-02	2026-10-02
https://app.letter.so/js/script.exclusions.local…anual.pageview-props.revenue.js	js	1.3 KB	2026-10-02	2026-10-02
https://app.letter.so/js/script.exclusions.local.manual.pageview-props.js	js	1.3 KB	2026-10-02	2026-10-02
https://app.letter.so/js/script.exclusions.hash.local.manual.tagged-events.js	js	2.8 KB	2026-10-02	2026-10-02
https://app.letter.so/js/script.exclusions.hash.…manual.revenue.tagged-events.js	js	3 KB	2026-10-02	2026-10-02
https://app.letter.so/js/script.exclusions.hash.…pageview-props.tagged-events.js	js	3 KB	2026-10-02	2026-10-02
https://app.letter.so/js/script.exclusions.local.manual.revenue.tagged-events.js	js	3 KB	2026-10-02	2026-10-02
https://app.letter.so/js/script.exclusions.hash.…-props.revenue.tagged-events.js	js	3.2 KB	2026-10-02	2026-10-02
https://app.letter.so/js/script.exclusions.local…-props.revenue.tagged-events.js	js	3.2 KB	2026-10-02	2026-10-02
https://app.letter.so/js/script.exclusions.local…pageview-props.tagged-events.js	js	3 KB	2026-10-02	2026-10-02
https://app.letter.so/js/script.exclusions.local.manual.tagged-events.js	js	2.8 KB	2026-10-02	2026-10-02
https://app.letter.so/js/script.exclusions.file-downloads.hash.local.manual.js	js	2.2 KB	2026-10-02	2026-10-02
https://app.letter.so/js/script.exclusions.file-…ds.hash.local.manual.revenue.js	js	2.2 KB	2026-10-02	2026-10-02
https://app.letter.so/js/script.exclusions.file-…wnloads.local.manual.revenue.js	js	2.2 KB	2026-10-02	2026-10-02
https://app.letter.so/js/script.exclusions.file-….local.manual.pageview-props.js	js	2.3 KB	2026-10-02	2026-10-02
https://app.letter.so/js/script.exclusions.file-…anual.pageview-props.revenue.js	js	2.4 KB	2026-10-02	2026-10-02
https://app.letter.so/js/script.exclusions.file-…anual.pageview-props.revenue.js	js	2.4 KB	2026-10-02	2026-10-02
https://app.letter.so/js/script.exclusions.file-….local.manual.pageview-props.js	js	2.3 KB	2026-10-02	2026-10-02
https://app.letter.so/js/script.exclusions.file-…h.local.manual.tagged-events.js	js	3.2 KB	2026-10-02	2026-10-02
https://app.letter.so/js/script.exclusions.file-…manual.revenue.tagged-events.js	js	3.4 KB	2026-10-02	2026-10-02
https://app.letter.so/js/script.exclusions.file-…manual.revenue.tagged-events.js	js	3.4 KB	2026-10-02	2026-10-02
https://app.letter.so/js/script.exclusions.file-…pageview-props.tagged-events.js	js	3.4 KB	2026-10-02	2026-10-02
https://app.letter.so/js/script.exclusions.file-…-props.revenue.tagged-events.js	js	3.6 KB	2026-10-02	2026-10-02
https://app.letter.so/js/script.exclusions.file-…-props.revenue.tagged-events.js	js	3.6 KB	2026-10-02	2026-10-02
https://app.letter.so/js/script.exclusions.file-…pageview-props.tagged-events.js	js	3.4 KB	2026-10-02	2026-10-02
https://app.letter.so/js/script.exclusions.file-…s.local.manual.tagged-events.js	js	3.2 KB	2026-10-02	2026-10-02
https://app.letter.so/js/script.exclusions.file-downloads.local.manual.js	js	2.1 KB	2026-10-02	2026-10-02
https://app.letter.so/js/script.exclusions.hash.local.manual.outbound-links.js	js	1.9 KB	2026-10-02	2026-10-02
https://app.letter.so/js/script.exclusions.hash.…anual.outbound-links.revenue.js	js	1.9 KB	2026-10-02	2026-10-02
https://app.letter.so/js/script.exclusions.local…anual.outbound-links.revenue.js	js	1.9 KB	2026-10-02	2026-10-02
https://app.letter.so/js/script.exclusions.hash.…utbound-links.pageview-props.js	js	2.1 KB	2026-10-02	2026-10-02
https://app.letter.so/js/script.exclusions.hash.…links.pageview-props.revenue.js	js	2.1 KB	2026-10-02	2026-10-02
https://app.letter.so/js/script.exclusions.local…links.pageview-props.revenue.js	js	2.1 KB	2026-10-02	2026-10-02
https://app.letter.so/js/script.exclusions.local…utbound-links.pageview-props.js	js	2 KB	2026-10-02	2026-10-02
https://app.letter.so/js/script.exclusions.hash.…outbound-links.tagged-events.js	js	2.9 KB	2026-10-02	2026-10-02
https://app.letter.so/js/script.exclusions.hash.…-links.revenue.tagged-events.js	js	3.1 KB	2026-10-02	2026-10-02
https://app.letter.so/js/script.exclusions.local…-links.revenue.tagged-events.js	js	3.1 KB	2026-10-02	2026-10-02
https://app.letter.so/js/script.exclusions.hash.…pageview-props.tagged-events.js	js	3.1 KB	2026-10-02	2026-10-02
https://app.letter.so/js/script.exclusions.hash.…-props.revenue.tagged-events.js	js	3.3 KB	2026-10-02	2026-10-02
https://app.letter.so/js/script.exclusions.local…-props.revenue.tagged-events.js	js	3.3 KB	2026-10-02	2026-10-02
https://app.letter.so/js/script.exclusions.local…pageview-props.tagged-events.js	js	3.1 KB	2026-10-02	2026-10-02
https://app.letter.so/js/script.exclusions.local…outbound-links.tagged-events.js	js	2.9 KB	2026-10-02	2026-10-02
https://app.letter.so/js/script.exclusions.file-….local.manual.outbound-links.js	js	2.3 KB	2026-10-02	2026-10-02
https://app.letter.so/js/script.exclusions.file-…anual.outbound-links.revenue.js	js	2.4 KB	2026-10-02	2026-10-02
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https://app.letter.so/js/script.exclusions.file-…utbound-links.pageview-props.js	js	2.5 KB	2026-10-02	2026-10-02
https://app.letter.so/js/script.exclusions.file-…links.pageview-props.revenue.js	js	2.5 KB	2026-10-02	2026-10-02
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https://app.letter.so/js/script.exclusions.file-…utbound-links.pageview-props.js	js	2.4 KB	2026-10-02	2026-10-02
https://app.letter.so/js/script.exclusions.file-…outbound-links.tagged-events.js	js	3.3 KB	2026-10-02	2026-10-02
https://app.letter.so/js/script.exclusions.file-…-links.revenue.tagged-events.js	js	3.5 KB	2026-10-02	2026-10-02
https://app.letter.so/js/script.exclusions.file-…-links.revenue.tagged-events.js	js	3.5 KB	2026-10-02	2026-10-02
https://app.letter.so/js/script.exclusions.file-…pageview-props.tagged-events.js	js	3.5 KB	2026-10-02	2026-10-02
https://app.letter.so/js/script.exclusions.file-…-props.revenue.tagged-events.js	js	3.7 KB	2026-10-02	2026-10-02
https://app.letter.so/js/script.exclusions.file-…-props.revenue.tagged-events.js	js	3.7 KB	2026-10-02	2026-10-02
https://app.letter.so/js/script.exclusions.file-…pageview-props.tagged-events.js	js	3.5 KB	2026-10-02	2026-10-02
https://app.letter.so/js/script.exclusions.file-…outbound-links.tagged-events.js	js	3.3 KB	2026-10-02	2026-10-02
https://app.letter.so/js/script.exclusions.file-….local.manual.outbound-links.js	js	2.3 KB	2026-10-02	2026-10-02
https://app.letter.so/js/script.exclusions.local.manual.outbound-links.js	js	1.9 KB	2026-10-02	2026-10-02
https://app.letter.so/js/script.exclusions.local.manual.js	js	1.1 KB	2026-10-02	2026-10-02
https://app.letter.so/js/script.exclusions.js	js	1.7 KB	2026-10-02	2026-10-02
https://app.letter.so/js/script.exclusions.local.js	js	1.4 KB	2026-10-02	2026-10-02
https://app.letter.so/_next/static/chunks/9257.a3901e08b4702e7f.js	js	6.1 KB	2026-10-02	2026-10-02
https://app.letter.so/js/script.js	js	1.4 KB	2026-10-02	2026-10-02
https://app.letter.so/_next/static/chunks/9028.54c4532c15ad862b.js	js	48.5 KB	2026-10-02	2026-10-02
https://app.letter.so/_next/static/chunks/8758.d16fed8c9db09b53.js	js	20.9 KB	2026-10-02	2026-10-02
https://app.letter.so/_next/static/chunks/8633.4ab4da8b43fc875c.js	js	184.7 KB	2026-10-02	2026-10-02
https://app.letter.so/_next/static/chunks/8492.bb1842249cdfd365.js	js	8.6 KB	2026-10-02	2026-10-02
https://app.letter.so/_next/static/chunks/8444.b17de9be136ad726.js	js	8.5 KB	2026-10-02	2026-10-02
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https://www.letter.so/xd/	html	37.5 KB	2026-10-02	current
https://www.letter.so/pricing/	html	51.1 KB	2026-10-02	current
https://www.letter.so/blog/	html	29.8 KB	2026-10-02	2026-10-02
https://app.letter.so/login	html	41.6 KB	2026-10-02	current
https://www.letter.so/	html	168 KB	2026-10-02	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, 200 files, 7.5 MB; 55 libraries, 2 identifiers, 41 third-party hosts
55 libraries added
- stackedboost-shopify-assets 0.2.0
- @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
- @marimo-team/frontend 0.25.0
- artplayer-plugin-vast 1.0.0
- webex 3.12.0
- jspdf 4.2.1
- @reachfive/identity-core 1.42.0
- @reachfive/identity-ui 2.1.0
- ovenplayer 0.10.54
- and 43 more
2 identifiers added
- letter.so Plausible data-domain
- 23e4bd2a-9d5e-46b0-ba3b-9e59af6cb637 Crisp website id
42 third-party hosts added
200 files added

Questions about letter.so

How does PageSourceSearch know what letter.so 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 letter.so 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 letter.so?: 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 letter.so?: 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.