Catch voice agent failures before customers do.
Vocalyze places real phone calls, scores each conversation against your rubric, and turns every prompt or model change into a repeatable regression test.
Prefer self-serve? Start with 25 free test credits · no card required
Scenario setup
Frustrated caller escalation
Agent number
+1 (415) 555-0142
Caller language
Spanish (es-MX)
Latency threshold
1.0s to first answer
Goal
Caller insists on speaking to a human after two failed lookups. Agent must acknowledge, verify identity, then escalate.
Live call
IN PROGRESS 00:42Necesito hablar con una persona, por favor.
Entiendo, puedo transferirle ahora mismo.
0.8sRubric score
94/100Find signal in the noise.
Every call produces a stream of events. Vocalyze turns them into answers.
Why teams need agent evals
The riskiest call is the one you didn't test.
Launch risk hides in the long tail
A handful of manual test calls won't reveal the accents, interruptions, and edge cases that decide whether your agent holds up with real callers.
Quality drifts after every change
Prompts, models, and vendors keep moving. Regression testing keeps yesterday's fix from becoming tomorrow's failure.
Demos avoid the hard moments
Noisy callers, missing context, and policy traps are exactly where voice AI breaks — and exactly what Vocalyze simulates on every run.
How it works
From phone number to scored call in three steps.
Point us at your agent
Add your agent's phone number and pick from 30+ languages and locales. Vocalyze dials it over the real phone network.
+1 (415) 555-0142 · es-MX
Simulate real callers
Scripted or goal-based conversations play the caller — in any supported language — from a routine request to a frustrated escalation.
12 scenarios · 3 concurrent
Score and track
Every call is transcribed, scored against your rubrics, and measured for latency. Regressions surface before users find them.
94/100 · 0.8s answer time
Capabilities
Everything you need to trust your agent.
Real phone calls
Vocalyze dials your agent over the phone network — same codecs, same jitter, same interruptions — so you test exactly what callers hear.
Rubric scoring
Weighted criteria score every transcript — outcomes, answer quality, tone and latency thresholds — into one number you can trend.
Suite verdict
Pass
Latency tracking
Time from the end of caller speech to the agent's real answer — filler excluded.
Multilingual testing
30+ languages and locales with native-accent callers and per-language scoring.
Simulated callers
Scripted or goal-based conversations, from routine requests to escalations.
Regression alerts
Re-run your suite after every change and get flagged the moment quality drifts.
30+
Languages and locales
25
Free test credits monthly
±10ms
Latency measurement precision
3x
Concurrent calls per suite run
Guided reliability audit
Start with your hardest calls.
In a focused 14-day pilot, we turn your riskiest customer journeys into a reusable test suite, run them over the real phone network, and review the failures with your team.
10–20 high-risk scenarios
A weighted evaluation rubric
Real-call latency and transcript evidence
One regression rerun after a change
Put one production call flow under test.
We’ll help you build the scenarios, run the calls, and turn the findings into a regression suite.
Request an audit