Purrrr is the official app for international fans of Hello Street Cat. The app is developed by HI-BIKE HK LIMITED. Purrrr features many similar functions to Jiemao, the official Chinese app, while also having unique features.

Currently, Purrrr is under active development. The app is only out on Apple devices and is region-locked to the United States, EU, Japan, and Canada. An Android app version is currently waiting for approval on the Google Play store.