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Zelto is production analytics for voice AI agents. It sits on top of your voice provider — Vapi, Retell, LiveKit, or a custom stack — records every call, analyzes every transcript, and surfaces issues in how your agents handle calls: mispronounced names, missed voicemails, calls that drift from the script. Each issue is tied to the exact transcript moment it occurred. Connecting a provider takes a few minutes and doesn’t change how your agents run. Once an issue surfaces, you can route it to Slack or file it in Linear.
The Zelto findings dashboard, showing recurring issues across an organization's voice agents with priority, call volume, and assignee.

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How it fits together

Every call your agents handle becomes a conversation with a turn-by-turn transcript and its recording. Analysis surfaces per-call observations; you promote the recurring ones into findings — durable, shareable issues — and record the fix as a change. For the whole pipeline end to end, see How Zelto works.

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The core ideas

  • Agents — the voice and human agents in your organization.
  • Conversations — each call’s turn-by-turn transcript and recording, with on-demand AI summaries.
  • Findings — durable issues attached to the exact transcript moments that caused them.
  • Changes — agent-scoped fixes for one or more findings.
  • Experiments — compare real calls from two prompt-version groups on the monitors that matter to a change.
  • Integrations — voice ingest, Slack and Google Chat notifications, Linear issue-from-finding, and open API / MCP access.

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Works with your stack

Connect Vapi or Retell with an API key and a webhook URL you paste into the provider, forward finished sessions from a LiveKit worker, or POST calls from any other stack — Bland, Pipecat, or your own. They all land in the same place, tagged with the originating agent. Not sure which path is yours? See Connect a voice provider.

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Where to go next

Quickstart

Connect a provider and see your first transcript in five minutes.

How Zelto works

The whole pipeline end to end, from call to finding to change.

Guides

Triage findings, audit agents, and operate the platform.

API & MCP

Read everything programmatically over REST or MCP.