Case Study: CastBox achieves scalable audio search and analytics with Google Cloud and Firebase

Castbox Giving users a voice with Google Cloud

CastBox, a Beijing-based spoken-audio platform founded in 2016, needed a stable, scalable way to support rapid growth, handle up to 50,000 concurrent connections, and deliver differentiated features like in-audio search and personalized recommendations. The company turned to Looker’s analytics capabilities alongside its Google Cloud stack to better understand user behavior, content preferences, and large volumes of listening data.

Looker helped CastBox warehouse and analyze data at scale, with insights feeding product improvements, recommendation engines, and weekly feature updates. The results included more than 96% speech-to-text accuracy for in-audio search, 10 millisecond latency per connection, and the ability to process about 30 GB of new data per day and analyze up to 1,200 GB at a time, helping CastBox improve engagement and stand out from competitors.

CastBox

Shibin Li

Co-founder