It's called Wehe and it was recently approved for the iOS app store. It scans the various services and apps you have installed on your phone and determines if your ISP is treating traffic to/from the app differently.
Links:
Android: https://play.google.com/store/apps/details?id=mobi.meddle.wehe
iOS: https://itunes.apple.com/us/app/wehe/id1309242023
SourceDeveloped by David Coffnes, a researcher at Northeastern University, Wehe can detect if certain apps are being throttled by a mobile carrier or an internet service provider. The user first signs an online consent form (Coffnes is collecting data for his research) and clicks on "run test." Wehe computes download speeds from seven apps: YouTube, Amazon, NBCSports, Netflix, Skype, Spotify, and Vimeo.
This screenshot of the Wehe app shows Verizon throttling the Netflix, YouTube and Amazon apps
A screenshot of the app being run reveals "Differentation" over Verizon's network for YouTube, Netflix and Amazon. That indicates that these apps are being throttled by Big Red. Developer Coffnes says that this is the sort of information that people would like to know. With the data in hand, consumers can opt to switch carriers, or they could complain to the FCC.
Links:
Android: https://play.google.com/store/apps/details?id=mobi.meddle.wehe
iOS: https://itunes.apple.com/us/app/wehe/id1309242023
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