Betrap de Makelaar is a Chrome extension that enhances the real estate platform of the Netherlands by automatically identifying old publicly available property listings that are being re-listed as "like new." By clicking on the extension icon during your search, a pop-up from Betrap de Makelaar will display the price history of the specific property. This extension provides insights such as the initial listing date, original asking price, and historical property value.

Utilizing official data from the Central Bureau of Statistics (CBS), the Land Registry, Funda.nl, and Walterliving.com, Betrap de Makelaar aims to make the Dutch real estate platform more user-friendly and organized. With recent updates including interface improvements and price timeline grouping, this extension offers a convenient way to track property information.