Test ElevenLabs Voice Agents with Cekura

By Dileep Chagam · Founding Engineer at Cekura · ex-Apple · Updated June 2026

Why trust Cekura on voice AI evals

5M+ voice agent minutes tested in production.
Built by engineers from Google, Apple, Microsoft. Backed by Y Combinator.
60K+ voice AI calls evaluated daily.
Native integration for every major voice AI stack: LiveKit, Pipecat, Vapi, Retell, ElevenLabs.

ElevenLabs Conversational AI ships voice agents with the most natural-sounding TTS in the market, across 30+ languages. But production reliability needs testing the layers ElevenLabs does not cover — prompt compliance, tool calls, latency under load, and accent accuracy per locale. Cekura natively integrates with ElevenLabs Conversational AI to run automated scenarios, regression tests, and production observability.

What is ElevenLabs Conversational AI?

ElevenLabs Conversational AI is a voice agent platform built on top of ElevenLabs' industry-leading text-to-speech models. It covers the orchestration of speech-to-text, an LLM, and ElevenLabs TTS so teams can ship natural-sounding voice agents across 30+ languages without assembling the audio stack themselves.

Why test ElevenLabs agents?

ElevenLabs gives you best-in-class voices, but production failures usually live in the layers around the voice. Common failure modes to test for:

Prompt and instruction compliance under real conversations.
Tool calls firing with the right arguments, in the right order.
Time-to-first-audio and latency under concurrent load.
Pronunciation and accent accuracy per language and locale.

How Cekura's ElevenLabs integration works

Connect your ElevenLabs Conversational AI agent via native API integration.
Cekura auto-imports the agent configuration and tools.
AI-generated scenarios and evaluators run against the live agent.
Production calls are autofetched and scored against your evaluators continuously.

“ElevenLabs ships the best-sounding voices in the market. We make sure your agent isn't beautifully pronouncing the wrong answer.” — Dileep Chagam, Founding Engineer at Cekura

Validation checklist

Prompt and system-instruction compliance.
Tool-call correctness and argument validation.
Voice quality: naturalness and pronunciation.
Time-to-first-audio and end-to-end latency.
Accent and dialect handling per language.
Interruption / barge-in handling.
Behaviour under concurrent load.
Compliance disclosures per locale.
Graceful failure and fallback behaviour.
Regression coverage for every prompt and model change.

What Cekura measures

Time-to-first-audio and latency percentiles (p50/p90/p99).
TTS naturalness and pronunciation correctness.
Instruction-following and task-success rate.
Tool-call success rate and trace detail.
Per-language accuracy across 30+ languages.

Frequently Asked Questions

What is ElevenLabs Conversational AI?

ElevenLabs Conversational AI is a voice agent platform built on top of ElevenLabs' industry-leading TTS models.

How does Cekura integrate with ElevenLabs?

Cekura connects to ElevenLabs Conversational AI via native API integration.

Does Cekura test ElevenLabs TTS voice quality?

Yes. Cekura scores ElevenLabs output for naturalness, pronunciation correctness, time-to-first-audio, and audio quality under load.

Can I test ElevenLabs agents in multiple languages?

Yes. Cekura supports 30+ languages out of the box.

How long does ElevenLabs + Cekura setup take?

Under 10 minutes for the first test report.

Get started with ElevenLabs + Cekura

Connect your ElevenLabs Conversational AI agent and run your first automated test suite in under 10 minutes. Catch prompt, tool-call, latency, and voice-quality regressions before your users do.