The Coval Blog
- Jun 29, 2026 We raised $28M. Here's what's next for us.
- Jun 23, 2026 Coval Raises $28M Series A to Make Voice AI Reliable in Production
- Jun 15, 2026 Voice Agent Vendor Testing: How to Run a Bake-Off
- Jun 11, 2026 How to Create AI Judge Metrics You Can Trust
- Jun 4, 2026 Best STT Providers 2026: Independent Benchmarks & How to Choose
- Jun 1, 2026 Best TTS Providers 2026: Why Vendor Benchmarks Lie
- May 28, 2026 Vapi Review 2026: Composer, Evals & Vapi Voices
- May 25, 2026 ElevenLabs Voice Cloning Review 2026: v3, Scribe & Agents
- May 21, 2026 CI/CD for Voice AI Agents: The 2026 Pipeline Guide
- May 19, 2026 Voice AI Testing Build vs. Buy: When Internal Tools Hit a Wall
- May 16, 2026 Voice AI Regression Testing: Escape Whack-a-Mole
- May 14, 2026 Benchmarks
- May 13, 2026 Voice AI in Production: Why Agents That Pass Testing Still Break in the Wild
- May 10, 2026 Voice Observability for Voice AI in Production
- May 8, 2026 What Is an AI Agent? Complete Guide to Autonomous AI (2026)
- May 4, 2026 Voice AI Models in 2026: Comparing the LLMs Powering Voice Agents
- May 1, 2026 Voice AI Assistants Explained: How They Work, Top Platforms & How to Test Them
- Apr 27, 2026 Voice AI Agents: Architecture, Deployment & Evaluation Best Practices
- Apr 24, 2026 Best AI Agent Platforms in 2026: Voice, Chat & Code
- Apr 21, 2026 What Is Conversational AI? How It Works, Use Cases, and How to Evaluate It
- Apr 15, 2026 Manual QA Doesn't Scale for Voice AI. Start There Anyway.
- Apr 7, 2026 Voice AI Agent Evaluation: The Complete Guide (2026)
- Mar 23, 2026 Hamming vs Bluejay: Voice AI Testing Compared (2026)
- Mar 20, 2026 Hamming vs Cekura: Voice AI QA Compared (2026)
- Mar 19, 2026 Cekura vs Bluejay: Voice AI QA Compared (2026)
- Mar 18, 2026 Coval vs Hamming: Voice AI Eval Compared (2026)
- Mar 17, 2026 Coval vs Cekura: Voice AI Testing Compared (2026)
- Mar 16, 2026 Coval vs Bluejay: Voice AI Eval Compared (2026)
- Mar 10, 2026 Conversational AI Testing: End-to-End Validation for Dialogue Systems
- Mar 9, 2026 Voice Load Testing: Simulate Thousands of Concurrent Conversations
- Mar 7, 2026 Voice Load Testing: How to Simulate 10,000 Concurrent Calls
- Mar 6, 2026 How to Improve Voice Agent Response Coverage: Finding the Gaps in Your Training
- Mar 6, 2026 IVR Modernization Guide: How to Migrate from Legacy IVR to AI Voice Agents
- Mar 4, 2026 Call Center QA Software: AI-Powered Quality Monitoring for Contact Centers
- Mar 3, 2026 How to Measure Voice AI Latency: The Complete Guide
- Mar 3, 2026 Voice AI Latency: What Causes Delays and How to Fix Them
- Mar 2, 2026 Automated IVR Testing: How to Build a Regression Suite That Runs on Every Deploy
- Mar 1, 2026 7 Chatbot Testing Strategies That Catch Bugs Before Your Customers Do
- Feb 28, 2026 IVR Testing Tool: Automated Regression & Load Testing for Voice Systems
- Feb 26, 2026 How to Test Turn Detection in Voice AI Agents
- Feb 25, 2026 HIPAA-Compliant Voice AI: Provider Options and Architecture Patterns
- Feb 25, 2026 Vapi vs Retell AI: Which Voice AI Platform is Right for Your Project?
- Feb 24, 2026 Voice AI Echo Cancellation: Causes, Fixes, and Best Practices
- Feb 18, 2026 Bland AI Review 2026: Features, Pricing & When to Use It
- Feb 15, 2026 The Future of Speech-to-Speech AI: Inside Gradium and Kyutai's Approach to Full Duplex Conversation
- Feb 14, 2026 Retell AI Review 2026: Features, Pricing & When to Use It
- Feb 11, 2026 ElevenLabs vs Cartesia: Which TTS Provider is Right for Your Voice AI Project?
- Feb 9, 2026 Why Multi-Agent Voice AI Systems Fail: 7 Common Pitfalls and How to Avoid Them
- Feb 7, 2026 What is Voice AI Observability?
- Feb 3, 2026 Voice AI Evaluation Infrastructure: Why Most Teams Skip It and How to Build It
- Jan 31, 2026 Voice AI Continuous Improvement: How to Build Learning Systems That Get Better Over Time
- Jan 30, 2026 Build vs. Buy: Voice AI Evaluation Infrastructure Decision Guide
- Jan 28, 2026 Speech-to-Speech vs Cascaded Voice AI: Which Architecture Should You Deploy?
- Jan 27, 2026 The State of Voice AI Instruction Following in 2026: A Conversation with Kwindla from Pipecat and Zach from Ultravox
- Jan 18, 2026 Voice AI Production Failures: The $500K Cost of Skipping Evaluation Infrastructure
- Jan 18, 2026 Voice AI Testing Framework: Why 95% of Demos Work but Only 62% Survive Production
- Jan 16, 2026 The Three-Layer Testing Framework for Voice AI: Regression, Adversarial, and Production-Derived
- Jan 14, 2026 Voice AI Development Best Practices: Why Natural Language Beats Rule-Based Engineering
- Jan 11, 2026 Cascaded Voice AI Architecture: Why Enterprise Teams Choose Traditional Pipelines Over S2S
- Jan 10, 2026 Voice AI Platform Architecture: Why Multi-Model Systems Outperform Single LLMs
- Jan 9, 2026 Voice AI vs Chatbots in 2026: Why Leading Enterprises Are Going Voice-First
- Jan 7, 2026 Voice AI Drop-Off Rate: The Metric That Predicts Whether Customers Stay or Hang Up
- Jan 6, 2026 Voice AI Platform Comparison 2026: Benchmarks, Performance Data, and How to Choose
- Jan 4, 2026 The Complete Guide to Enterprise Voice AI Deployment in 2026
- Jan 3, 2026 Voice AI Evaluation in 2026: The 5 Metrics That Actually Predict Production Success
- Nov 17, 2025 What Voice AI Teams Can Learn from Hamel Husain: Beyond Vibe-Checks to Data-Driven Voice AI QA
- Oct 26, 2025 How Krew Runs 10,000+ Voice AI Evaluations Monthly with Coval (And Turns QA Into Sales Acceleration)
- Oct 2, 2025 How Flux is tackling one of the biggest challenges in Voice AI: Insights from the Deepgram CEO
- Aug 27, 2025 New Insights: Expanding Our Voice AI Stack Benchmarks Beyond TTS
- Aug 7, 2025 From Self-Driving Cars to Voice AI: How Simulation is Revolutionizing Voice Agent Development
- Jun 2, 2025 The Enterprise Voice AI Reality Check: Why Most Deployments Fail at Scale
- May 30, 2025 Evaluating Realtime Voice-to-Voice AI Agents: A Practical Guide
- May 26, 2025 From Hype to Reality: Enterprise Voice AI Deployment Lessons from Leaping AI
- May 23, 2025 AI Agent Testing Reveals Critical Gaps: Why 90% Success Isn't Good Enough
- May 13, 2025 Vapi and Coval: Powering End-to-End Voice AI Reliability at Scale
- Apr 29, 2025 How to Optimize Your Voice AI Stack for the Financial Industry
- Apr 2, 2025 The ultimate Voice AI Stack
- Mar 27, 2025 Voice AI Platforms in 2025: A Conversation with Vapi Founder Jordan Dearsley
- Mar 12, 2025 How to Evaluate Text-to-Speech Models for Voice AI Applications: Insights from Cartesia
- Feb 27, 2025 Voice AI in Banking: Why Evaluation is Critical for Compliance and Customer Experience
- Feb 21, 2025 How to Test & Evaluate Voice Agents: A Practical Guide To Testing & Quality Assurance
- Jan 26, 2025 When to Build vs Buy Your Voice AI Infrastructure: Insights from Daily's CEO
- Jan 21, 2025 How to Integrate Coval + Langfuse into Your Voice AI Stack: A Complete Guide to Voice Agent Evaluation
- Jan 20, 2025 Customer Spotlight: How Phonely Uses AI Agent Evaluations to Build Better Voice Agents
- Jan 9, 2025 Scripted Evaluation Framework for Large Language Models: A Controlled Approach to Comparative Analysis
- Jan 23, 2024 Coval raises $3.3M to bring Self-Driving Car Simulation to AI Voice & Chat Agents