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Full observability for your Retell voice agents

Connect your Retell agent to Tuner with no code, paste your API key, add your Agent ID, and every call's transcript, latency, and outcome flows in automatically. One quality layer that scales with you across every stack you build on.

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Setup

Integrate in under two minutes

Connect your Retell agent to Tuner with your API key and Agent ID. Tuner handles the webhook setup for you.

Get your Retell credentials

Copy your Retell API key and Agent ID from the Retell dashboard. Your Agent ID starts with agent_

Add your key in Tuner

Go to Workspace Settings → API Keys & Integrations, paste your Retell API key, and save it before creating your agent.

Add your Retell agent

Create a new agent in Tuner. Select Retell as the provider and enter your Retell Agent ID as the Agent Remote ID.

Tuner configures the webhook

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

Read the Retell 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 Retell's built-in monitoring

Retell's evals bill at ~+$0.10/min—costs climb with call length and scale. Tuner charges per call regardless of length, adds pre-launch SIP simulation with AI agents, and stays independent: not the vendor grading its own agent

Capability

Tuner

Retell 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 Retell agents.

Read the docs

Do I need to write any code to connect Retell to Tuner?

Will connecting Tuner break my existing Retell webhook?

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?