Coval has raised a US$28m Series A led by Norwest to build testing infrastructure for voice agents, the unglamorous plumbing that decides whether one is safe to put on a phone line.
Founder Brooke Hopkins came from Waymo, where trusting a probabilistic system meant millions of simulated miles and regression suites that catch the one behaviour that quietly changed. Coval ports that discipline to voice: simulate conversations at scale, observe production calls, then label and review them. Customers already include Zoom and Deepgram, and the company notes voice AI drew more than US$7b in venture funding in the first quarter of 2026 alone.
It fits a pattern where every AI wave eventually spins off a standalone evaluation company once deployment moves past the demo, the same way autonomous driving did. The open question is whether voice reliability becomes a durable budget line or a feature the model vendors simply absorb.