Back in 2016, Hammad Syed and Mahmoud Felfel, an ex-WhatsApp engineer, thought it’d be neat to build a text-to-speech Chrome extension for Medium articles. The extension, which could read any Medium story aloud, was featured on Product Hunt. A year later, it spawned an entire business. “We saw a bigger opportunity in helping individuals and organizations create realistic audio content for their applications,” Syed told TechCrunch. “Without the need to build their own model, they could deploy hum...