E2E Testing for
Retell AI Voice Agents
Retell makes it fast to ship voice agents. vspec makes sure they keep working. Run automated call tests against your Retell number on every deploy.
Point vspec at your
Retell number. Done.
Add your Retell phone number
Paste in the phone number from your Retell dashboard. vspec places a real call to it — no webhooks, no SDK changes required on your end.
Write your test scenarios
Describe the caller's dialogue and the outcomes your Retell agent must achieve. Appointment setting, FAQ handling, lead qualification — whatever you built.
Get pass/fail on every deploy
Trigger tests manually or from your CI pipeline. vspec calls your Retell agent, captures the full transcript, and returns structured results.
Catch regressions before
your users do.
LLM prompt regressions
Retell agents are LLM-powered. Any prompt tweak can break conversation flow. vspec catches this automatically on every change.
Custom function validation
Test that your Retell custom functions fire at the right moment — CRM writes, calendar lookups, webhook triggers — and return expected results.
Interruption handling
Simulate callers who interrupt, ask off-topic questions, or go silent. Make sure your Retell agent recovers gracefully every time.
End-to-end conversation flows
Validate full multi-turn dialogues from greeting to goodbye. Ensure that Retell's state machine follows the path you designed.
Ship Retell agents with
confidence.
Free tier. No credit card. First test in under 2 minutes.
Start testing for free →