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Full observability for your Vapi voice agents

Connect your Vapi assistant to Tuner with no code, paste your API key and every call's transcript, latency, and outcome flows in automatically. Works with both permanent and transient agents, so even inline per-call assistants stay grouped and analyzable.

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Setup

Integrate in under two minutes

Paste your Vapi key, point Tuner at your assistant, and Tuner configures the webhook for you.

Get your Vapi credentials

Copy your Private API key and Assistant ID from the Vapi dashboard.

Add your key in Tuner

Paste your Vapi Private key under Workspace Settings → API Keys & Integrations and save, before you create the agent.

Create your agent

Add a new agent in Tuner with Provider: vapi and your Assistant ID as the Agent Remote ID.

Tuner wires the webhook

Tuner configures the Vapi webhook automatically. Already using a webhook? The webhook proxy forwards every call to your existing n8n or Zapier flow too.

Read the Vapi guide →

Setup

Works with both Permanent and Transient agents

However you build on Vapi, Tuner captures every call — including the inline, per-call agents that normally vanish.

Permanent agents

Stored in Vapi, referenced by Assistant

Your assistant lives in the Vapi dashboard and every call points at its Assistant ID. Connect it to Tuner once and all of that agent's calls are captured, scored, and alerted on automatically.

Transient agents

Built inline, per call, and they scatter

You hand Vapi the whole agent inline on every call, so nothing is stored and calls aren't tied to an Assistant ID. Tuner pulls those scattered calls back into one view, grouped by customer, use case, or prompt version — so multi-business and per-caller agents stay fully analyzable.

Read the Vapi Transient guide →

Why Tuner

See what's happening in production

Voice agents fail quietly, and at a scale no team can review by hand. Tuner turns every production call into structured data you can search, debug, evaluate, alert on, and test against.

Debug in minutes

When a call goes wrong, see exactly what happened and where — the full transcript, every turn, stage-level latency, tool calls, and conversation state. No more guessing from sparse logs.

Get alerted the moment something breaks

Don't wait for a customer complaint. Create alerts using red flags, metrics, evals, and multiple conditions, then get notified when a critical call fails or a problem starts appearing across your traffic.

Test before you ship

Run realistic call simulations over SIP before launch and after every change. Score simulations with the same evals you use in production, so regressions are caught before your callers find them.

Diagnose failures at scale

When you're handling thousands of calls a day, manual review doesn't scale. Tuner finds patterns across your traffic, traces failures to their source, and helps you turn what you learn into evals and alerts.

Measure what matters

Track outcomes, intents, extracted data, latency, cost, and custom evals across your Retell traffic. Filter down to the calls that matter and understand how your agent is performing over time.

Debug in minutes

When a call goes wrong, see exactly what happened and where — the full transcript, every turn, stage-level latency, tool calls, and conversation state. No more guessing from sparse logs.

Get alerted when something breaks

Measure what matters

Track outcomes, intents, extracted data, latency, cost, and custom evals across your Retell traffic. Filter down to the calls that matter and understand how your agent is performing over time.

Test before you ship

Run realistic call simulations over SIP before launch and after every change. Score simulations with the same evals you use in production, so regressions are caught before your callers find them.

Diagnose failures at scale

Comparison

Tuner vs Vapi Monitoring

Vapi's monitoring, alerting, and evals are good. The problem is that Vapi is scoring the same agent it built, and it only reports per turn. One turn can hide several nodes, so you get a number without knowing which step broke. Tuner stays independent and goes node by node, pointing to the exact STT, LLM, or TTS step behind a failure or delay. It also tracks quality across versions and runs SIP simulations with AI agents before you ship.

Capability

Tuner

Vapi Monitoring

Vapi

Vendor-independent observability, eliminating the conflict of a platform evaluating its own output

Evals pricing built for scale: tuner price per call, no per minute surcharge

Built-in flags (hallucination, dead air, early hangup)

Root-cause diagnosis with a specific fix, not just metrics

30+ voice quality metrics & red flags out of the box

Drift & regression alerts over time

SIP call simulations with AI agents, using your live evals

Turn-by-turn transcripts & latency traces

FAQ

Frequently asked questions

Common questions about connecting Tuner to your Vapi agents.

Read the docs

Do I need to write code to connect Vapi to Tuner?

Will connecting Tuner break my existing Vapi webhook?

Does Tuner work with transient (inline) Vapi agents?

What gets captured?

Can I test my agent before going live?

How long does setup take?

Does Tuner support alerts and monitoring?

Can I define my own evaluations and metrics?

How is Tuner priced?

Is my call data private and secure?