Seattle voice AI startup Ultravox, formerly known as Fixie, acquired by Inworld

The co-founders of Ultravox, which launched in 2022 as Fixie, from left: Hessam Bagherinezhad, Matt Welsh, Justin Uberti and Zach Koch. (Fixie Photo) Seattle voice AI startup Ultravox , which launched as Fixie , has been acquired by Inworld for an undisclosed sum. Ultravox was founded in 2022 by Google and Apple veterans to build a speech model for real-time, natural-sounding AI voice agents.