Production-grade observability for voice AI. Latency breakdown, transcript search, hallucination detection — purpose-built for Vapi, Retell, Bland, and OpenAI Realtime.
No credit card · Connect Vapi in 60 seconds
Built for the leading voice AI platforms
Built for voice
Helicone and Langfuse see prompts and responses. Voice agents have transcripts, audio, function calls, latency budgets, and hangup signals. We see all of it.
STT, LLM, and TTS time isolated per call. P50/P95 across every agent.
Cluster calls by why they ended. Find the call that lost you the customer.
When the AI claims something it shouldn't know, we flag it. You investigate.
Every tool invocation tracked. Success rate, retries, payload shape, time-to-tool.
Define quality rubrics in plain English. Claude evaluates every call against them.
Find calls by meaning, not keywords. 'Customers asking about refunds' just works.
What you see
Transcripts, sentiment, intent, CSAT estimate, latency P50/P95, function call success — analyzed by Claude in under 2 seconds.
Pricing
We undercut Helicone, Langfuse, and LangSmith — and we're built specifically for voice. Start free, upgrade when you outgrow it.
100 calls/mo
1,500 calls/mo
10,000 calls/mo
50,000 calls/mo
Overage above plan: $0.015 per call. Alerts at 80% / 100% / 120% — no surprise bills.
Pricing covers VoiceObs only. You bring your own Vapi or Retell account and pay them directly for calls — VoiceObs analyzes the data, it doesn't replace your provider.
Start with 100 free calls per month. Upgrade when you need more.
No credit card required