CallProbe
Early access
01
Open source any voice stack

Know what your callers actually hear.

CallProbe calls your voice agent over the real phone network every few minutes and alerts you when it is slow, silent or broken.

Join the waitlist
Probe recording · two channels FAIL
greeting2,760 ms
response2,180 ms
agent channel our prompt what the caller waits through
02

Your dashboards are not your callers.

Turn delay

~950 ms

One team's dashboards said the agent was fast. Callers heard about 950 ms of delay on every turn.

No audio

0 audio

A freelancer who fixes production agents keeps finding SIP trunks lost after a restart, and greetings that play before the audio is connected.

Slow greeting

7 s

Another team's agent took 7 seconds to say hello: 7 seconds of silence at the start of every call.

03

How it works

  1. We call your agent like a customer would.

    A real phone call from a Twilio number, on a schedule. It listens, asks one question and hangs up. Vapi, Retell, LiveKit, Pipecat or your own stack: if it has a number, it works.

  2. We measure the recording, not your logs.

    Greeting latency, response latency, dead air, talk-over, a silent agent, a clipped greeting. Optionally, a transcript checked against the phrases you expect.

  3. You get one alert, not a hundred.

    Slack when a probe starts failing, when the problem changes and when it recovers. A status page with p50/p95 latency and history.

04

Try it in two minutes, no accounts

Terminal: callprobe demo
# synthetic calls with known latencies, then the status page
pip install callprobe
callprobe demo
callprobe analyze callprobe-demo/bookings-latest.wav

  greeting     2760 ms after answer, lasts 1820 ms
  response 1   2180 ms after our prompt ended
  result       FAIL
    - [slow_response] agent answered after 2180 ms (limit 2000 ms)

callprobe serve      # http://127.0.0.1:8707

# then point it at your real agent (bring your Twilio account)
callprobe watch --every 15m

Each probe is a real call: about a minute of phone time plus a minute of your agent's own time.

05

Pricing (provisional)

Open source

$0
  • Run it yourself
  • Bring your Twilio account
  • Slack alerts, status page

Hosted

$49/mo
  • 1 agent
  • Probe every 15 min
  • We run it for you

Team

$149/mo
  • 5 agents
  • Probe every 15 min

Agency

$299/mo
  • 20 agents
  • For agencies running many clients' agents

Each probe uses about 30 seconds of your agent and phone time: one probe every 15 minutes is about 2,880 probes per agent a month. Phone minutes are paid by the caller and are not included. The hosted plans are not live yet: join the waitlist.

06

Get early access to the hosted version

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