Roark

Roark is purpose-built for teams that are already using voice agent platforms like VAPI or Retell and need a rigorous testing and monitoring layer. If your voice agent is still in prototype or you're just experimenting, the $500/month minimum will feel like overkill. But once you have live calls with real customers, every broken interaction erodes trust and costs money — that's where Roark earns its keep. The pre-deployment simulation is particularly strong: graph-based conversation flows, configurable personas, and auto-generation of test cases from failed production calls mean you can catch regressions before they hit users. Post-deployment, the 40+ metrics (latency, sentiment, repetition, instruction-following) and multi-speaker analysis give you the data to debug why a call went wrong. Compared to generic observability tools like Datadog, Roark is specifically tuned for voice — it understands speaker turns, can detect compliance failures, and evaluates tool calls. The downside is the consumption-based pricing with a $500 monthly minimum; small teams may find this prohibitive. Also, if you're building your own voice stack from scratch, you'll need to use the SDKs rather than the one-click integrations. In practice, we'd recommend Roark for any team with at least a few hundred live calls per month. It's not a replacement for your voice agent platform, but it's the safety net that lets you sleep at night.