What is CallCheck?
CallCheck is an AI voice-agent testing tool that validates recorded AI phone calls against expected tool behavior for engineering teams building voice systems. You import a structured call export from Vapi, Retell, or a normalized JSON file (up to 1 MiB), define contract policies for what the agent should have done, and CallCheck compares the actual run against those expectations. The checks cover tool count, tool arguments, tool results, tool order, and message patterns, so you can catch wrong booking dates, duplicate bookings, or missing tool results before a change ships. Every finding links back to the specific event that triggered it in a detailed evidence report, and you can save a recorded baseline to run regression comparisons on later calls. The current build is labeled "Call action checker v0.1," and it runs entirely in the browser: no keys, no account, and no call data leaves your machine, which matters when transcripts contain customer details. For teams on BestAIFor comparing AI call QA options, CallCheck fills the narrow gap between a voice agent and a human reviewer spot-checking recordings by hand.
What is CallCheck used for?
Validating recorded AI voice-agent calls against expected tool actions and catching regressions before deployment.
How much does CallCheck cost?
Pros and cons
Pros
- Imports Vapi, Retell, and normalized JSON call exports (up to 1 MiB)
- Contract policies check tool count, arguments, results, order, and message patterns
- Evidence reports link each finding to the specific call event that caused it
- Saved baselines enable regression comparisons across later calls
- Runs entirely in-browser with no account, keys, or data upload
Cons
- Early v0.1 release, so feature set and stability are still maturing
- Limited to voice-agent testing; not a monitoring or analytics dashboard
- Native support covers only Vapi and Retell exports beyond generic JSON
- 1 MiB import cap can be restrictive for very long call transcripts
Questions about CallCheck
What is CallCheck used for?
CallCheck is used to validate recorded AI voice-agent calls against expected tool behavior. Engineering teams import a call export, define expected actions, and CallCheck flags errors such as wrong booking dates, duplicate bookings, or missing tool results before the change is deployed.
Is CallCheck free?
Yes. CallCheck is free to try with no signup required. It is an early v0.1 release and runs entirely in your browser.
Which voice platforms does CallCheck support?
CallCheck natively imports call exports from Vapi and Retell, and also accepts a normalized JSON format up to 1 MiB for calls from other sources.
Does CallCheck upload my call data?
No. CallCheck runs checks entirely in-browser and your call data stays on your machine. It requires no keys, account, or upload of call recordings.
What are the best alternatives to CallCheck?
Vapi's own testing tooling, Retell test suites, and Hamming AI for voice-agent QA.
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