JavaScript Library & Framework
6,289 of the 1,000,000 top sites in our Tranco top-1M census run Underscore.js (0.6%). A utility JavaScript library providing functional helper methods for working with arrays, objects, and functions. Detection is homepage-level HTML/header fingerprinting, so a site can run Underscore.js on other pages without it showing here.
Other javascript library & framework
| # | Domain | Global traffic rank | Contacts |
|---|---|---|---|
| 1 | uk.com | #532 (Tranco) | Find emails |
| 2 | washington.edu | #773 (Tranco) | Find emails |
| 3 | eu.com | #891 (Tranco) | Find emails |
| 4 | us.com |
| Site | Tranco rank | Also detected | Contacts |
|---|---|---|---|
| uk.com | #532 | Google Tag Manager, Let's Encrypt, Modernizr + 2 more | Find emails |
| washington.edu | #773 | AddToAny, Apache, Backbone.js + 13 more | Find emails |
| eu.com | #891 | Google Tag Manager, Let's Encrypt, Modernizr + 2 more | Find emails |
| #1,036 (Tranco) |
| Find emails |
| 5 | alphonso.tv | #1,063 (Tranco) | Find emails |
| us.com |
| #1,036 |
| Google Tag Manager, Let's Encrypt, Modernizr + 2 more |
| Find emails |
| alphonso.tv | #1,063 | AdRoll, Bootstrap, Cloudflare Bot Management + 13 more | Find emails |
| index.hu | #1,344 | Apache, DoubleClick (Google Ads), Google Analytics + 9 more | Find emails |
| de.com | #2,610 | Google Tag Manager, Let's Encrypt, Modernizr + 2 more | Find emails |
| cn.com | #2,896 | Google Tag Manager, Let's Encrypt, Modernizr + 2 more | Find emails |
| uk.net | #3,093 | Google Tag Manager, Let's Encrypt, Modernizr + 2 more | Find emails |
| cnil.fr | #3,155 | Bootstrap, Cloudflare, Cloudflare edge/CDN + 5 more | Find emails |
| caltech.edu | #3,195 | ApexCharts, Cloudflare Bot Management, Cloudflare edge/CDN + 4 more | Find emails |
| us.org | #3,299 | Google Tag Manager, Let's Encrypt, Modernizr + 2 more | Find emails |
| arduino.cc | #3,587 | Amazon CloudFront, Amazon Route 53, Amazon S3 + 21 more | Find emails |
| zerocdn.com | #3,789 | Bootstrap, Django, Let's Encrypt + 4 more | Find emails |
| backblaze.com | #4,025 | AWS Lambda, CHEQ, Cloudflare + 21 more | Find emails |
| uw.edu | #4,274 | Apache, Backbone.js, DoubleClick (Google Ads) + 5 more | Find emails |
| gb.net | #4,329 | Google Tag Manager, Let's Encrypt, Modernizr + 2 more | Find emails |
| br.com | #4,446 | Google Tag Manager, Let's Encrypt, Modernizr + 2 more | Find emails |
| trueconf.com | #5,107 | Cloudflare Turnstile, Google Fonts, Google Tag Manager + 9 more | Find emails |
| neocities.org | #5,119 | Bluesky, Bootstrap, Let's Encrypt + 3 more | Find emails |
| yna.co.kr | #5,125 | Amazon CloudFront, Amazon S3, Citrix NetScaler + 12 more | Find emails |
| yodobashi.com | #5,949 | Akamai Bot Manager, Akamai edge/CDN, Akamai mPulse + 5 more | Find emails |
| jpn.com | #6,295 | Google Tag Manager, Let's Encrypt, Modernizr + 2 more | Find emails |
| anjuke.com | #6,610 | Google Analytics, Nuxt.js, Tencent EdgeOne + 3 more | Find emails |
| transformativeworks.org | #6,849 | Atlassian Statuspage, Bluesky, Cloudflare + 6 more | Find emails |
From the Crawlora Website Tech Stack Dataset, a homepage-level fingerprint of a 1,000,000-domain Tranco top-1M census (run top1m-2026-08-25-full-v2), snapshot August 29, 2026. Directional, not exhaustive — fully custom or bundled stacks under-detect. Methodology →