Say what the voice agent should do. Code it with your coding agent.
Free to start. Works with Claude Code, Cursor and Codex.
Already have an account? Sign in
Runs locally
The coding agent writes it in Curb.js and puts it live on KugelAudio.
It talks to the voice agent as a simulated caller and fixes what breaks.
Every call is written down. Paste one in, or let the coding agent read them, and it fixes what went wrong.
Voice agent included
Left to code
Curb.js
Kugel Agents
Models
Works out of the box.
A tuned, ready-to-use voice agent.
Open source.
Self-hostable, on your own servers.
Improves itself.
Failed calls become fixes, kept as tests.
Coding agent first.
Describe the result. A coding agent builds it.
Deploys in seconds, like a website on Vercel.
All models included.
Versioning.
Every deploy is kept.
Instant rollback.
Any earlier version, live again in one step.
Staging and production.
Changes are tried before callers hear them.
Deploy on push.
A push to GitHub goes live by itself.
Playground.
Any version can be tried in the browser.
For a first voice agent.
€0/mo.
Start buildingIncludes:
For voice agents in production.
€49/mo.
Upgrade to ProAll Hobby features, plus:
For large and regulated teams.
Custom
All Pro features, plus:
Billed by the second, only while a call is connected. Prices in euro, excluding VAT. Phone costs on our numbers are passed on at cost.