Which mobile crash-reporting tool did Twitter acquire in January 2013?

Twitter acquired Crashlytics in January 2013. Crashlytics was a mobile software-development company whose main product collected and analyzed crash reports from apps.

Founded in 2011 by Wayne Chang and Jeff Seibert, Crashlytics became known for helping iOS and Android developers identify crashes quickly and understand which devices, operating-system versions, or code paths were affected. Twitter paid more than $100 million, making it one of the company's largest acquisitions at the time.

Twitter later used Crashlytics as the foundation for Fabric, a broader suite of mobile developer tools announced in 2014. Fabric added features for analytics, beta distribution, authentication, and advertising-related development. Google acquired Crashlytics and Fabric in 2017, and Crashlytics ultimately became part of Firebase. A common mix-up is treating Crashlytics as only a standalone reporting app; it was primarily a developer SDK and later a core component of a larger mobile platform.