On the road to online success, it’s essential to check on the web technologies your competitors are using to learn what are your advantages/disadvantages over them. Have you ever wondered what popular sites like TechCrunch have under their sleeves?
Use this tool called Builtwith (Web Page Technology Profiler) to gather as much as technical information of the site.
Tell Me How to Use Builtwith:
1) Enter your site url (yoursite.com as example) and click on the Lookup button.
2) Technical details/web technologies that are being used by the websites such as what web server? JavaScript libraries? analytics programs they use and what widgets are installed will appear on the screen.
Click on the image below to see sample of the result..
Of course you can also check out what builtwith.com is made up off using the tool too (they don’t hide it). 
August 18th, 2007 at 5:52 pm
Quite useful tool.
August 19th, 2007 at 2:53 am
the hyperlink is spelt incorrectly and hence it returns error when clicked.
August 19th, 2007 at 6:23 am
prakash: Link fixed.
August 19th, 2007 at 4:53 pm
thanks for the review…i must try this..
August 19th, 2007 at 8:53 pm
I agree this is an extremely useful tool. Thanks!
August 22nd, 2007 at 2:58 am
seems like a good web 2.0 idea. The tool had to be improved a lot. Its not displaying server information and site coding technology. But I think its a good start.