Patter
Open-source voice-AI SDK. The Vapi/Retell alternative for builders who want to own the stack. Give your AI agent a phone number in 4 lines — Python and TypeScript, MIT licensed, Twilio, Telnyx, and Plivo.
Create a voice AI agent that can make phone calls and handle conversations using a simple SDK.
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Free · no card · unsubscribe anytimeOpen-source voice-AI SDK. The Vapi/Retell alternative for builders who want to own the stack. Give your AI agent a phone number in 4 lines — Python and TypeScript, MIT licensed, Twilio, Telnyx, and Plivo.
Patter has 1k stars on GitHub. It has been forked 118 times. Patter is written mainly in Python. It has been in active development since 2026. Patter is available under the MIT license. Its main topics are ai-agent, ai-phone-agent, hermes-agent, llm.
Compare with the paid tools it replacesWhat is Patter?
Open-source voice-AI SDK. The Vapi/Retell alternative for builders who want to own the stack. Give your AI agent a phone number in 4 lines — Python and TypeScript, MIT licensed, Twilio, Telnyx, and Plivo.
Is Patter open source?
Patter is an open-source project. It is released under the MIT license.
Is Patter free?
Yes. Patter is free and open source — you can use, modify and self-host it.
What license does Patter use?
Patter is available under the MIT license.
What language is Patter written in?
Patter is written mainly in Python.
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