Voice AI QA for agencies
You run production agents for many clients at once. Zelto listens to every call across all of them, and makes sure you hear about a regression before the client does — with the fix already drafted.
Client agents are a different problem
Building one agent is engineering. Running twenty of them for paying clients is quality assurance at scale — and someone's reputation is on every call.
The client hears the bad call first
The worst way to learn your agent broke is a forwarded recording from an angry client. Zelto grades every call as it lands, and per-customer Slack alerts mean the account owner knows within minutes, not weeks.
Twenty agents, one delivery team
Manual call review doesn't scale past your second client. Zelto listens to everything, clusters recurring failures into Findings per agent, and ranks them by call volume — so your team works the ranked list.
Proving quality is part of the deliverable
Clients ask how you know the agent is working. Findings — with severity, example calls, and what you fixed — are the evidence. QA stops being overhead and becomes something you can show.
Every hotfix risks a regression
A prompt tweak for one client's edge case can break the flow that was working. Zelto grades every call after every change, so regressions surface as Findings within hours — tied to the change that caused them.
One QA layer across your whole portfolio
Connect every client stack
Vapi for one client, Retell for another, something custom for a third — Zelto ingests them all natively or via one REST call. Each new client onboards in under 15 minutes.
Alerts routed per client
Findings flow to per-customer Slack channels, so each account owner hears about regressions on their agents instantly — without watching a dashboard.
Fixes your team can ship
Every Finding ships with a drafted prompt fix and an optional Linear ticket. Your delivery team — or their coding agent — closes the loop before the client's next check-in.
What agencies ask us
The questions that come up with every agency and dev shop. Answered honestly.
One week. One agent. Ten findings
Connect one production agent. Zelto listens, then walks you through ten findings with severity, examples, and fixes.
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