Voice AI systems are becoming integral to customer service and virtual assistant applications, but ensuring these voice agents perform reliably and meet quality standards is a key challenge.

A number of innovative platforms have emerged to help teams evaluate and improve voice AI performance. This article provides an overview of five notable solutions, each offering unique strengths for testing, quality assurance (QA), and performance monitoring of voice AI agents.

Use these insights to compare options - and consider whether an eval platform or a full-stack voice AI platform is the right choice for you.

Why Evaluation & QA Matter for Voice AI

Before diving into different vendors, let’s understand the challenge.

Modern voice agents are no longer simple scripted bots. They must handle multi-turn dialogue, listen and speak naturally, detect sentiment or intent shifts, handle accents and background noise, comply with regulatory demands (especially in sectors like finance or healthcare), and integrate with complex back-end systems.

According to research, enterprise usage of voice-native AI is increasing sharply: by the end of 2025 many organisations are shifting away from off-the-shelf tools toward custom, compliance-aware voice solutions. 
Having the right QA, monitoring and evaluation tooling is critical to:

• Catch edge-cases before they reach customers

• Monitor live behaviour, detect “drift” or degradation

• Define and track KPIs such as resolution rate, escalation rate, latency, compliance violations

• Iterate quickly without breaking production

In that context, choosing the right Voice AI eval platform becomes a strategic decision.

But there’s another possibility: selecting a platform that includes evaluation as part of the full voice AI stack.

Coval: End-to-End Evaluation & Observability for Mission-Critical Voice AI

Coval brings techniques inspired by autonomous systems (self-driving cars) into voice AI.

The core idea: simulate thousands of conversational workflows before live deployment, then monitor real-world calls for drift, failures or compliance issues.

Key strengths:

• Large-scale scenario simulation: teams can define voice workflows, run thousands of virtual interactions across accents, edge-cases and stress conditions.

• Unified observability post-deployment: monitoring failed intents, latency, policy violations, business-specific KPIs (e.g., refund eligibility or escalation).

• Multi-agent, multi-tenant support: good for large enterprises with multiple voice agents, across geographies, with integrated CI/regression testing.

• Manual QA integration: you can leave feedback on simulations and live calls, resimulate from transcripts, iterate on metrics aligned with human judgement.

Where it’s ideal: deployments in high-risk or highly regulated domains (e.g., telecoms, medical voice assistants, enterprise support) where you need simulation + live monitoring + CI-driven regression.

Considerations: If you’re looking for more than just evaluation (e.g., you also need the agent runtime, the orchestration, the voice stack) you’ll still need to pair simulation/QA with a separate voice-AI platform.

Roark: Real-Call Testing and Observability for Voice AI

Roark takes a “Datadog for voice AI” approach: convert real customer interactions into automated, reusable test cases and monitor production calls in real time.

Key strengths:

• Production-based tests: capture live calls (including sentiment, tone, timing) then turn them into automated test suites.

• Edge-case coverage: test variations across languages, accents, noise, network conditions, and discover rare edge-cases via AI.

• CI/CD & regression: trigger tests on each deployment, catch regressions before customers see them.

• Real-time analytics & alerts: dashboards for conversion funnels, pauses, sentiment, and alerts via Slack/PagerDuty when performance or compliance slip.

• Monitoring: full funnel visibility from dev → staging → production.

Where it excels: Organizations with substantial live voice-traffic who want close visibility into how the agent performs in the real world, and who iterate frequently.

Limitations: again, this is more evaluation/observability than the full voice-AI stack. You’ll pair it with your voice agent platform of choice.

Cekura: End-to-End Testing & Monitoring for Voice Agents

Cekura (formerly Vocera) offers a full QA pipeline: from automated scenario generation to evaluation metrics to live monitoring.

Key strengths:

• Automated scenario generation: creates diverse test-cases (persona, accents, background noise) from agent descriptions or dialogue flows—reducing script-writing burden.

• Custom evaluation metrics: define KPIs like “follows instructions correctly”, “uses tool/API when required”, interruption rates, latency, etc.

• Actionable insights: prompt-level recommendations and insights to help refine the agent (learn how to ensure the reliability of a voice AI agent).

• Live monitoring & alerts: once deployed, track sentiment, drop-offs, failures, escalate when thresholds breached.

Where it fits: organisations looking for a robust QA solution across the entire lifecycle—from pre-launch testing through to production monitoring—without needing to build the simulation infrastructure themselves.

Note: While very strong in QA, you’ll still need to choose or integrate your voice-AI agent runtime, unless Cekura also offers voice-agent orchestration (not always the case).

Hamming: Automated Stress-Testing & Analytics for Voice AI

Hamming focuses squarely on scalability, stress-testing and governance. For use-cases where call volumes are huge and reliability at scale is non-negotiable.

Key strengths:

• High-scale automated testing: uses “voice characters” or simulated concurrent test callers to place thousands of calls, uncovering issues that only appear under peak load or varied inputs.

• Analytics & governance: tracks completion rates, error frequencies, latency across test + live calls; generates trust & safety reports (compliance, inappropriate responses).

• Prompt management & versioning: supports prompt/script version control, re-testing every time a prompt or model changes to avoid regressions—a major benefit given how prompt changes often introduce unexpected failures.

Ideal for: large enterprises with massive call volumes (e.g., drive-through ordering, bank IVRs, telecom support) where scaling, governance and high reliability are top priorities.

Gap: It’s about QA and scalability—not necessarily the voice-agent runtime or orchestration layer.

Leaping AI: Self-Improving Voice Agents with Built-in QA

Last but not least, Leaping AI takes a different tack: instead of being just an evaluation or QA platform, it offers voice agents and integrates the QA/evaluation loop into the agent’s lifecycle. In other words, you get the voice-AI agent + self-improvement + QA in one package.

Key features & differentiators:

• Self-improving voice agents: after each call, the agent reviews its own performance, identifies what went well/what didn’t, and adjusts its own prompts/behaviour accordingly (e.g., via A/B testing of prompt variations, continuous fine-tuning).

• Automated internal QA: the platform allows you to run AI-driven QA on call transcripts (far faster than manual review), generate reports on script-fidelity, policy adherence, deviation from desired behaviour.

• Customisable evaluation metrics: define business-specific metrics (faithfulness to knowledge base, naturalness/professionalism of responses, customer-satisfaction score proxy, etc.).

• Live monitoring & iteration: the dashboard tracks performance over time (e.g., human hand-offs, escalation rates, resolution rates), flags regressions/trends, allowing strategic tuning—not just reactive fixes.

• Full stack: instead of choosing a separate QA tool and a voice-agent platform, you get both—reducing integration burden, vendor-multiplicity and time-to-value. Leaping AI’s platform delivers the most human-like voice agents that can automate a large portion of calls and then automatically analyze their own performance to get better with each interaction.

When Leaping AI makes sense: if you are looking for a voice AI solution that not only supports agent deployment, but continuously improves itself and includes built-in QA/monitoring out of the box. For many businesses, this “one-platform” approach simplifies operations, shortens cycle times, and increases confidence in deployment.

How to Choose a Voice AI or Voice AI Eval Platform

With these platforms in mind, here’s a suggested checklist (adapted from industry guides) to help you evaluate voice-AI QA & evaluation platforms—and to see where a full-stack voice-AI platform might win.

• Voice-agent orchestration vs evaluation only: Do you need just QA/monitoring, or an end-to-end platform (voice agent + QA + monitoring)?

• Scale and traffic volume: Do you anticipate thousands of concurrent voice sessions, peaks, global users, accents? Hamming-style stress-testing may matter.

• Pre-launch simulation vs live real-call observability: Some tools focus on simulation (Coval), others on live monitoring (Roark), others cover both (Cekura).

• Automated test-case generation: Are you writing scripts manually, or do you need AI to generate diverse scenarios automatically?

• Built-in QA and feedback loops: Does the platform enable transcripts → automated QA → insights → improvement?

• Continuous iteration / prompt version control: With frequent model or prompt updates, you’ll want versioning and regression testing (Hamming, Leaping AI).

• Monitoring, analytics & alerting: Dashboards that show funnel metrics (conversion, escalation, latency), sentiment, drop-offs, and provide alerts when KPIs slip.

• Multi-language, multi-accent, noise robustness: Especially if you serve global or diverse user, multilingual Voice AI makes sense.

• Compliance/security/regulation support: Especially vital in regulated industries (financial services, healthcare).

• Integration with your stack: APIs, webhooks, CRM/ERPs, ability to plug in.

• Data ownership, vendor lock-in, flexibility: Avoid being locked into a sub-optimal stack or unable to pivot.

By running features of each vendor against these criteria, you’ll get a clearer view of fit and value-for-money.

Integrating the Market Context + Your Backlink

To place this in the current market: The voice-AI agent and platform market is growing fast, driven by demand for voice-native interactions, real-time performance, and voice-agent workflows built for enterprise. For example, some studies project the voice-AI market to reach tens of billions in value, with strong growth rates. 

Given that scale and growth, deploying a voice-agent platform that you’ll want to iterate on for years is more important than simply picking a quick QA add-on. (And if you’re still comparing multiple voice-AI platforms, you may also find value in our earlier piece: “5 Best Voice AI Providers 2025 Compared”, which covers a broader set of platforms and helps refine your selection.)

Conclusion: Key Takeaways on Voice AI Evals

All five platforms – Roark, Cekura, Hamming, Coval, and Leaping AI – are addressing the challenge of voice AI quality and reliability, each through a distinct lens. Roark emphasizes real-world call replay and sentiment monitoring to improve production performance. Cekura offers a full QA pipeline from automated test generation to live analytics. Hamming focuses on stress-testing voice agents at scale with compliance and safety checks. Coval unifies simulation-based regression testing, and monitoring in one platform. Leaping AI integrates self-improvement and automated QA directly into the agent’s feedback loop.

For decision-makers evaluating voice AI performance and QA solutions, the good news is that these platforms can significantly reduce the manual effort of testing and increase confidence in AI voice agents.

Each platform highlighted here positively contributes to making voice AI deployments more robust and trustworthy in enterprise settings. But if your team is serious about voice automation (not just proof-of-concepts), then looking at a platform like Leaping AI - rather than just buying a QA tool - makes sense.

Are you ready to modernize and automate your customer service?

For businesses looking not just for a testing tool but for a voice AI solution maintains and upgrades its own quality, Leaping AI offers a compelling package of hands-off improvement and customizable QA.

Book a free Voice AI demo today and convince yourself. 🤝