Stop Calling Your Own Voice Agent.Simulate It.
Testing voice AI manually is slow, incomplete, and nobody’s favourite task. Run hundreds of simulation calls in minutes, and know exactly what breaks before your customers find it.
Run Your First Simulation
HOW IT WORKS
Real Voice Calls. 100s of simulation scenarios in minutes.
Tuner makes actual voice calls to your agent to make sure it's ready before the real ones call. You define what your agent does. Tuner builds the scenarios that stress test it.
✓
Auto-Generated For Your Use Case
Tuner reads your agent's configuration, Intents, and Call Outcomes to automatically generate simulation scenarios that reflect your actual use case, not generic test cases.
✓
Choose Your Simulation Mix
Set the ratio of Routine Callers to Pressure Tests. Routine Callers work through your agent's everyday workflows. Pressure testers target specific failure modes, hallucination, scope boundary, escalation handling, offensive language, and more.
✓
AI Callers Dial Your Agent
Tuner spins up AI Callers, real voice agents, that call your agent and run each scenario as an actual phone call. Different personas, accents, moods, and speaking styles. If it can happen on a real call, it happens here first.
✓
Every Call Is Scored Against Your Evals
Each simulation call is evaluated against the exact same Evals and guardrails you've configured for production. No separate setup. You see what passed, what failed, and where your agent broke down before any real caller does.
THE SIMULATION MIX
You Control What Gets Tested.
Run a full health check or targeted tests. Every Simulation Run is yours to configure.
Routine Callers
Happy Path Testing
AI Callers that simulate your everyday customers, cooperative, on-topic, working through your agent’s normal workflows. This is your happy path test. See how your agent performs when everything goes the way it’s supposed to.
Pressure Tests
Find the Breaking Point
AI Callers that simulate the difficult ones, unhappy customers, edge cases, people trying to bypass your process or ask for something outside scope. If your agent has a breaking point, this is where you find it.
Scenarios
Control Your Scope
Test across your entire use case for a broad health check, or narrow it down to a specific Intent, Call Outcome, or behaviour check. Added a new workflow? Changed how your agent handles a specific case? Run hundreds of simulations around just that before it goes live.
Verbosity
Why Volume Matters
In voice, the same intent said ten different ways produces ten different conversations. Rushed, hesitant, overly detailed, unclear, small differences in how a caller speaks can completely change how your agent responds. The more simulations you run, the more of these variations you cover.
THE EVAL LOOP
Your Production Evals Run Every Simulation.
No separate scoring. No extra configuration. Every simulation call is evaluated against the exact same Evals, Call Outcomes, and Intents you've already set up for your live agent.
✓
Same Evals, Every Run
Whatever you've configured to catch Failures in production, hallucinations, missed Intents, wrong Call Outcomes, runs automatically on every simulation call. What fails in production will fail here first.
✓
See Failures Before Your Customers Do
Every Simulation Run surfaces exactly what passed and what failed. Fix the Failures, adjust your agent, and run again before a single real caller is affected.
✓
Regression Built-In
Changed a prompt? Updated a workflow? Every time you run a simulation, you're also checking that nothing you already fixed has broken again.
GET STARTED
Three steps to generate hundreds of simulation calls. Our AI Callers dial in, simulate every happy path and rough edge, and score every call against your Evals. No code changes to your agent required.
01
Set Up Your Agent on Tuner
Connect your voice agent and configure your Call Outcomes, Intents, and Evals. This is your production monitoring setup, simulation runs on the same config.
02
Configure Your SIP URL
Connect your SIP trunk and Tuner places real calls. Simulations run over SIP/PSTN so voice is tested the way people actually dial in.
03
Run Simulations at Scale
Generate hundreds of scenarios, set your Simulation Mix, and run. Every call comes back scored against your Evals, see what passed, what failed, and exactly where your agent broke down.
Full setup guide and SIP configuration by provider: Simulation SIP guide.