The first actual web app I built solo was also my first solo professional web app. It was called Pagepooch and it was a price and page tracker - you'd submit a web page using a bookmarklet and it would either track the price of a product as it changed, or track changes to the page content. It was built with CodeIgniter 2 and had a companion Phonegap app.
It's no longer active but you can see it at web.archive.org/web/20130517174018...
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