So many eyeballs, so little growth. Or so Yahoo’s recent performance under Marissa Mayer could be summarized. Joining Yahoo as its head in 2012, Mayer quickly made a splash with a rapid series of acquisitions, from the billion dollar purchase of Tumblr to the $30 million acquisition of Summly. The performance of that strategy has been lackluster. While Yahoo has acquired nearly 50 companies during Mayer’s tenure, its financial results have done little to persuade investors that the company has found a path to growth. That has raised questions about the viability of the app studio model. Unlike platform product companies like Facebook, app studios rely on monetizing a portfolio of products. Among mobile app companies, this business structure is most common in the games industry, and indeed, there are certain parallels to Hollywood movie studios with their focus on entertainment franchises. There is one startup, though, that is proving that an app studio model can exist outside ...