Though it is for free, the app has been making enough in-app ad revenue for the five-member startup, Zhong Nan, co-founder and CTO of Talkray told me. Based in the U.S., the startup was founded by Zhong Nan (a Chinese) and Zafer Ahmed (an Indian), who used to be colleagues at Motorola. The company just announced a new round funding of US$5.3 million from Zhen Fund (a Chinese seed investment firm), Lerer-Hippeau, SV-Angel, and General Catalyst. Prior to this round, the company raised US$2.1 million from General Catalyst, Andreessen Horowitz, Lerer Ventures, and SV Angel. Talkray is Y Combinator alumnus that graduated from the seed accelerator in 2012.