Microsoft has now retired its Dev Center app for Windows Phone, but a new version of the app should be available soon. An in-app message states an updated Dev Center app will be released in early 2016.
Microsoft first launched the Dev Center app in February 2013, allowing developers of those apps quick access to analytical data from the Windows Store. That included features like viewing download and crash trends for each of their apps, a way to read user reviews, and payment information.
With today's changes, the Dev Center app now redirects developers to Microsoft's Windows Dev Center dashboard via a web browser to view their data. The page has been optimized for mobile phone viewing. However, the message added:
"We're working on a new Universal Windows app which will provide data for all of your apps for Windows devices, including apps submitted through the new unified Windows Dev Center and those targeting Windows 10."
Thanks to Jakub and Praveen for the tip!