Test the Voice Agents You Build on Vapi
Deploy autonomous evaluators that call your Vapi assistants and Squads like real customers, scoring every call on 30+ telephony metrics and conversation on 9 quality metrics, with a clear go-live verdict.
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Test Every Vapi Call and Conversation. One Platform.
Test Vapi Inbound Assistants
Test your inbound Vapi assistant with live calls before launch and batch analysis of production recordings after, scored across 30+ telephony metrics.
Live Inbound Test Calls
Dial your Vapi number and run the real flow: a caller changes a shipping address, the assistant captures, confirms, and reads it back, with speaker-labeled transcripts and DTMF keypad capture.
Latency and Turn-Taking Metrics
Track response latency against the sub-500ms target, plus words per minute, first-call resolution, intent recognition, CSAT, containment rate, and speech-to-text accuracy.
Production Recording Analysis
Batch-upload recorded inbound calls with transcripts for automated speaker-identified playback and scoring, catching a prompt or knowledge change that broke yesterday's calls.
From the First Ring to Production
Test Before Launch, Analyze After Every Change
Run simulated conversations and live test calls before launch, then batch-analyze production recordings with the same metrics, so swapping a model, editing the prompt, or updating the knowledge base never silently regresses a working call.
Total Quality Coverage for Vapi Assistants
Score live calls across 30+ flow, latency, audio, and speech-to-text metrics, and the conversation across 9 quality metrics, from a single inbound assistant to a multi-assistant Squad.
UX and Business Ops Metrics
Track CSAT and detected sentiment, containment rate, early call termination after a silence or endpointing misfire, and how often the assistant correctly escalates to a human.
Go-Live Verdict Before You Take Real Calls
Get a Green, Yellow, or Red verdict from four weighted dimensions, with confidence scaled to your evaluation volume, so you know whether the assistant is ready to answer a live phone number.
Inside Vapi Testing on TestMu AI
9 QUALITY METRICS
Score Conversations on 9 Quality Metrics
Your Vapi assistant is evaluated across thousands of scenarios on the same nine metrics, scoring every multi-turn exchange and Squad handoff, with customizable 0-100% pass/fail thresholds.
Try for free- Bias, hallucination, and completeness checks
- Context awareness across turns and transfers
- CSAT, file handling, and generation accuracy
PRE & POST EVALUATION
Test Before Launch, Analyze After
Pre-evaluation places live test calls to your Vapi assistant; post-evaluation batch-analyzes real recordings, catching a model swap or prompt edit before it reaches a live caller.
Try for free- Live inbound and outbound test calls
- Passive monitoring and outbound number pool
- Batch analysis of production recordings
SCENARIO & VOICE CONFIGURATION
Configure Scenarios and Voices
Shape each test to mirror a real call: generate scenarios from your own knowledge, pick a caller voice and accent, add traffic or call-center noise, and control call flow down to response timing.
Try for free- Auto-generated scenarios and a persona library
- 15 background-noise presets for resilience
- Masked numbers and call-flow controls
AUDIO, STT & ISSUE DETECTION
Catch Failures Automatically
Beyond pass and fail, the platform surfaces why a call broke, from a hallucinated order detail to an endpointing misfire, patchy audio, or a name mis-transcribed letter by letter, with precise mismatch logging.
Start Testing Your Vapi Agent- Pitch tracker, Voice Quality Index, and SNR
- Speech-to-text accuracy mapping
- Automated issue tags for every failure
Built on Universal Testing Foundations
Project & Environment Management
Register Vapi assistants, manage test environments, and scope variables with bulk creation.
Test Profiles & Personas
Inject reusable key-value test data and use a pre-built or custom caller persona library for targeted scenarios.
Validation Criteria
Define custom, evidence-based pass/fail rules per scenario with High/Medium/Low confidence tracking.
Security & Infrastructure
Execute via HyperExecute with optional secure tunnels for firewall-restricted telephony and tool backends.
Scheduling Engine
Automate call runs with preset frequencies or full custom cron expressions and IANA timezone support.
Go-Live Assessment
Get a Green, Yellow, or Red verdict from four weighted dimensions with AI-powered failure-pattern analysis.
Success Stories of TestMu AI (Formerly LambdaTest)
50%
reduction in test execution time
“HyperExecute is a highly reliable test execution platform and has excellent customer support.”
Sagar Uday Kumar
Sr. Engineering Manager
Some Love from our Customers
As Best Egg expanded its product offerings and entered new markets, we knew our old testing infrastructure couldn’t keep up.
With support from Tenny Agustin, our Engineering Operations Lead, we modernized our approach with
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Excited to Share My Learning Journey with Kane AI & Lambda Tool!
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