Fixa – an open source Python package for testing voice agents
hey! this is oliver and jonathan and today, we’re launching fixa — a free, open source package to test voice agents. fixa uses a voice agent to call your voice agent and an LLM to evaluate how the conversation went. here's a demo: https://youtu.be/LAW1wW6SjTo this was initially a paid feature of our platform, but the monetization model didn't really make sense. our customers were paying us for all the components of our agent (STT + LLM + TTS + markup) in addition to their own agent – even though many of them have preferred vendors, volume discounts, and credits. we came to the…
Fixa – an open source Python package for testing voice agents launched on January 21, 2025 with 15 votes, #917 of 6,142 launches that month and more than 75% of that year's launches. The site was still online in September 2026, 1 year on.
In plain words
Fixa is an open source Python package that enables developers to test voice agents by having one voice agent call another and using an LLM to evaluate the conversation quality. Built for teams developing voice applications, it allows users to bring their own API keys for speech-to-text, language models, and text-to-speech components rather than paying for bundled services. The package is free to use and available on GitHub.
written from the facts on this page · September 2026
From the sources
Contribute to fixadev/fixa development by creating an account on GitHub.
fixa is a python package for testing and evaluating AI voice agents. it uses a voice agent to call your voice agent and an LLM to evaluate how the conversation went. pip install fixa-dev set up your environment variables in a .env file OPENAI_API_KEY= DEEPGRAM_API_KEY= CARTESIA_API_KEY= TWILIO_ACCOUNT_SID= TWILIO_AUTH_TOKEN= NGROK_AUTH_TOKEN= run a test: make sure to replace TWILIO_PHONE_NUMBER and PHONE_NUMBER_TO_CALL with your own numbers. if you have a paid ngrok plan, be sure to add your ngrok domain to the listener variable. from fixa import Test , Agent , Scenario , Evaluation , TestRunner from fixa . evaluators import LocalEvaluator from dotenv import load_dotenv import ngrok , os ,…from github.com
In the maker’s words, at launch
hey! this is oliver and jonathan and today, we’re launching fixa — a free, open source package to test voice agents. fixa uses a voice agent to call your voice agent and an LLM to evaluate how the conversation went. here's a demo: https://youtu.be/LAW1wW6SjTo this was initially a paid feature of our…
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