VoxGrade plugs directly into Vapi. Import your assistants, run 25+ automated quality tests, and get an instant grade — before your agent talks to a single customer.
How It Works
Connect, pick, grade. No SDK. No code changes. Works with your existing Vapi setup.
Paste your Vapi API key into VoxGrade. We securely authenticate and pull your assistant list in seconds.
Select any Vapi assistant from the dropdown. VoxGrade reads your config, system prompt, tools, and voice settings automatically.
VoxGrade runs 25+ automated tests, scores each metric, assigns a letter grade, and gives you actionable fix recommendations.
25+ Quality Metrics
Every dimension of voice agent quality, scored individually and rolled into a single letter grade.
Is the greeting natural, on-brand, and contextually appropriate?
Smooth turn-taking, logical transitions, no awkward pauses or loops.
Does the agent provide correct information from its knowledge base?
How gracefully does the agent handle mid-sentence interruptions?
Empathy detection, tone matching, de-escalation under pressure.
PII handling, jailbreak resistance, regulatory boundary adherence.
Are tools invoked correctly with the right parameters at the right time?
Clean transfers to humans with full context. No dropped conversations.
Appropriate prompts during silence. No premature hang-ups or infinite waits.
Catches fabricated info, made-up policies, and confident wrong answers.
Deep Integration
Not a generic testing tool. VoxGrade understands Vapi's architecture and tests what matters for voice-first agents.
Reads your assistant config automatically — system prompt, model, voice provider, tools, and squad setup. No manual entry needed.
Validates that your Vapi tools fire correctly. Tests parameter accuracy, error handling, and edge cases for every function your agent uses.
Works with any LLM behind Vapi — GPT-4o, Claude, Gemini, DeepSeek, or custom models. Same grading, any provider.
Auto-grade production calls via Vapi webhooks. Every real conversation gets scored and logged — catch regressions before customers complain.
Import your assistant, run the full test suite, and get your grade — no credit card, no commitment.
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