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C#
Python
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Java
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C (programming language)
BuiltWith
C#A great tool to help you discover the technology being used by a variety of websites. I was impressed that upon signing up that I had full access to a free list of leads.
Based on our record, BuiltWith seems to be a lot more popular than C#. While we know about 162 links to BuiltWith, we've tracked only 1 mention of C#. We are tracking product recommendations and mentions on various public social media platforms and blogs. They can help you identify which product is more popular and what people think of it.
Evan You, creator of Vue.js, is a prime example. Vivek Nair, Co-Founder of BotGauge, notes that You โcreated something that addresses real developer needs with clean logic and thoughtful design.โ Vue.js powers over 1.5 million websites in 2025, a testament to its scalability and developer trust, as reported by BuiltWith. Youโs ability to build a framework independently, without corporate backing, underscores his... - Source: dev.to / over 1 year ago
There exist websites like https://builtwith.com so answer to your question is yes. - Source: Hacker News / over 1 year ago
BuiltWith says the web client is NextJS which is interesting as ChatGPT made a big switch away to Remix IIRC. https://builtwith.com/?https%3a%2f%2fclaude.ai%2fnew. - Source: Hacker News / almost 2 years ago
Also, wow that is an obsene amount of libraries they use: https://builtwith.com/?https%3a%2f%2fspectrum.ieee.org%2fdisney-robot-2668135204. - Source: Hacker News / over 2 years ago
I would say run both sites through https://builtwith.com/ to get what all they used in the building process. Source: over 2 years ago
There are a few reasons why I prefer Go over Java and C#, not least of which is the standard library. You can install plenty of packages to do almost anything you want, but Go's standard library is minimalistic and very readable (what is golang?). - Source: dev.to / over 5 years ago
Wappalyzer - Wappalyzer is a technology profilers and leads data provider. Create lists of websites and contacts that use certain technologies.
Python - Python is a clear and powerful object-oriented programming language, comparable to Perl, Ruby, Scheme, or Java.
WhatRuns - Extension that helps you identify technologies used on any website at the click of a button.
JavaScript - Lightweight, interpreted, object-oriented language with first-class functions
Elucify - A completely free software tool that uses crowdsourced data to find business email addresses
Java - A concurrent, class-based, object-oriented, language specifically designed to have as few implementation dependencies as possible