QA for voice agents in production.
Every prompt change risks breaking conversation flows your customers depend on. Bug0's AI agents and forward-deployed engineers catch what breaks before your customers hear it.
Voice agents are shipping faster than ever. Testing them is still manual, slow, and incomplete. We fix that.
Backed by Accel, Peak XV, Salesforce Ventures, Naval Ravikant, and Guillermo Rauch.
You ship the update.
We test every conversation it touches.
Prompt changes · Model swaps · API updates · New integrations
The problem
Voice agents break silently.
Every time you ship.
One change. Thirty broken flows. Your customers hear it before you do.
What slips through every time
Prompt changes break working flows
Accents cause cascading failures
Latency spikes derail conversations
Interruptions freeze the agent
Tool calls fail silently
Compliance checks get skipped
Agent mangles names and emails
Awkward silences with no recovery
What we do
A diagnosis, not a dashboard.
AI agents + human engineers on every test run.
Bug0's AI agents simulate hundreds of real conversations against your voice agent. Different personas, accents, interruptions, background noise, edge cases. Our forward-deployed engineers review every failure, triage what's real, and report exactly what broke and where.
Audio, logs, and the exact point of failure.
You get a diagnosis, not a dashboard. Audio recordings of failed conversations. Turn-by-turn latency breakdown. Tool call pass/fail. The exact point in the flow where things went wrong. Something you can act on before your next deploy.
Trusted by fast-moving teams.
“Bug0 gives us the speed of AI-native automation with the accuracy and self-healing of human QA. Their hybrid approach is a game changer.”
“Bug0 is the closest thing to plug-and-play QA testing at scale. It's helped us catch multiple bugs before they made it to prod.”
“We plugged Bug0 into our CI and had our critical flows covered within a week. Like having a proactive QA engineer reviewing every deploy.”
“Bug0 integrates seamlessly into our workflow and delivers instant value. The automated test coverage gave us confidence to ship faster.”
“With Bug0, regression testing became effortless. They update tests as fast as we ship, so we can release with confidence every time.”
How it works
From your first commit to your last deploy.
We learn your agent.
Share your agent's config, system prompt, and critical conversation flows. Our FDEs map every path your customers take.
AI generates your regression suite.
Bug0's AI agents create hundreds of test scenarios tailored to your flows. Personas, accents, noise, interruptions, tool call variations, edge cases you'd never think to test manually.
Tests run on every change.
Every prompt update, model swap, or integration change triggers your full regression suite automatically. No manual effort.
FDEs triage and report.
Our forward-deployed engineers review failures, separate real bugs from noise, and deliver actionable reports with audio recordings, logs, and the exact point of failure. You fix. You ship.
Platforms
Built for teams on
any voice platform.
If your agent handles real calls, we can test it.
Vapi
Retell
LiveKit
Twilio
Bland.ai
ElevenLabs
Custom / in-house
Early access
Get early access.
We're onboarding a small group of design partners running voice agents in production.
Design partner program
Work directly with our team to shape the product. Your edge cases become our roadmap.
Priority onboarding
We handle setup end-to-end. From flow mapping to your first full regression run in days, not weeks.
Full coverage from day one
Every conversation flow, every edge case, every deploy. Backed by AI agents and forward-deployed engineers.