How does the Speechify integration work?

Add your Speechify API key under Settings → Integrations → Speechify in Zelto, then set the webhook URL Zelto gives you as the webhook_url on your Speechify agent. Finished calls arrive as conversations within a few seconds, with full transcripts.

Does Zelto import past calls?

Yes. When you import a Speechify agent, Zelto retrieves its calls from the past 14 days, so you have graded history on day one.

Do I need to change my Speechify agent?

Only to set the webhook URL. Your prompts, voices, and configuration stay as they are.

What happens when Zelto finds a problem?

Each Finding ships with severity, example calls that jump to the failing seconds, a drafted fix, and an optional Linear ticket for your team or your coding agent.

QA for yourSpeechify agents

Your Speechify voice agent talks to real callers all day. Zelto grades what it actually said on every production call, and turns recurring failures into ranked, fixable Findings.

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What actually breaks on voice agents in production

Dashboards show you that calls happened. They don't show you the calls that quietly failed — and those are the ones that cost you customers.

Answers that sound right and aren't

A natural voice makes every answer sound confident, including the wrong ones. Zelto grades the substance of what was said, not the delivery.

Tool and lookup failures the caller never hears

A booking or lookup fails mid-call and the agent carries on as if it had worked. Zelto flags every call where something failed and the conversation continued anyway.

Callers stuck in dead ends

Callers repeat themselves, ask for a human, or get looped through the same question. Zelto clusters these calls into one Finding ranked by how many callers hit it.

Regressions after prompt changes

Every prompt edit can shift behavior on calls you didn't test. Zelto grades every call after every change, so a regression becomes a Finding with the calls that prove it.

How Zelto works with Speechify

Step 01
Connect
Add your Speechify API key in Zelto, copy the webhook URL it shows, and set it as the webhook_url on your Speechify agent. Finished calls arrive as conversations within seconds, with transcripts, and importing an agent backfills the past 14 days.
Step 02
Zelto listens and diagnoses
Every production call is graded against a rubric Zelto auto-learns from your traffic — your domain, your language, your definition of a good call. No setup, no scorecard to write.
Step 03
Findings, with the fix drafted
Calls that fail for the same reason are clustered into one Finding, ranked by volume, with example calls, a drafted prompt fix, Slack alerts, and an optional Linear ticket.

Production traffic, not simulations.

Simulation tools grade synthetic conversations against scenarios you wrote. Zelto grades what actually happened with real callers on your Speechify agents — because that's where the failures that matter live. Most teams are integrated in under 15 minutes.