DTL Tools

DTL supports different tools intended to shed light on how personal data is used by websites and applications.

Some of the Tools promoted by DTL


Floodwatch is a Chrome extension that can be downloaded from Chrome Store . This extension tracks the ads you see as you browse the Internet and helps you understand both the volume and the types of ads you’re being served during the course of normal browsing. The goal is increasing awareness of how advertisers track your browsing behavior, build their version of your online identity, and target their ads to you as an individual.


$heriff is an experimental service that allows users to search for traces of price discrimination in the Internet. It let users knows whether e-retailers vary their prices dynamically based on the information that they can collect online for the potential customer (such as her location, browser/OS, incoming link, navigation history, etc.). $heriff can be installed from Firefox Add-on Store and Chrome Store

Facebook Data Valuation Tool (FDVT)

Facebook Data Valuation Tool is a browser plugin that allows users to understand how much money Facebook makes thanks to their online activity. The plugin monitors the ads you are been displayed and the ads in which you click in, and based on Facebook information it estimates the amount of money Facebook makes thanks to them. If you are using Chrome, you can already a version from the Chrome Store . This tool has been developed by Carlos III University, which was awarded with one of the 2015 DTL Grants.

Princeton Web Census

This tool provides information about the measurements performed on 1 million web sites. The measurements were focused on identifying the tracking techniques used by those websites, both stateful (cookie-based) and stateless (fingerprinting-based). The tool can be used to check which tracking techniques are used by a given website or to check how widely used a given tracking technology is. This tool has been developed by Princeton University, which was awarded with one of the 2015 DTL Grants.


This tool shows users what information is being sent by mobile applications to third parties, including understanding how companies are tracking their movements in their day-to-day life. ReCon detects device/user identifiers used in tracking, geolocation leaks, unsafe password transmissions, and personal information such as name, address, gender, and relationship status. This information is available to users via a private Web page, and ReCon allows them to provide feedback on whether important leaks have been found, and whether the leak should be blocked or the information sent modified.

ReCon Visualization

This tool, developed by the Data Transparency Lab, shows the information gathered by ReCon Project in a way that let users understand what is going on with the applications they use in their smartphones. For instance, it lets users identify the Applications that leak the most Personal Information and the domains that aggregate more Personal Information from users. You can use this tool directly at the DTl website