Review of Fixa
Fixa is an open-source platform for testing and observability of AI voice agents. Its engine calls your agents with other voice agents and uses an LLM to evaluate the conversation. The platform detects latency, interruptions and information-collection errors. Available via pay-as-you-go, backed by Y Combinator, it has become a standard for teams scaling voice agents and looking to prevent regressions.
Fixa: Un agent vocal appelle votre agent vocal et un LLM évalue la conversation, en continu.
Best for
- Teams shipping AI voice agents
- Startups wanting to test voicebots continuously
- SaaS scaling callbots in production
- Devs integrating Fixa into their CI/CD
Not ideal for
- Projects without voice agents
- Non-developers wanting turn-key tools
- Teams with a complete QA platform already
- Very occasional use cases
Pros & cons
- ✅ Open source with code accessible on GitHub
- ✅ End-to-end tests with real automated voice calls
- ✅ LLM evaluation of transcripts and qualitative scoring
- ✅ Latency, interruption and collection error detection
- ✅ Slack alerts on regressions
- ⚠️ Developer-focused, not for non-devs
- ⚠️ Voice minutes costs to monitor at scale
- ⚠️ Young ecosystem vs legacy QA tools
- ⚠️ Fast-evolving documentation
Our verdict
Fixa stands as one of the most innovative tools in the AI voice agent ecosystem. Its angle is unique: test a voice agent with other voice agents, then use an LLM to evaluate the conversation. This approach covers complex scenarios that classic tests could not reproduce. Detection of latency, interruptions and collection errors is precious for teams running voicebots in production. The open-source nature and pay-as-you-go model make it particularly accessible for startups and technical teams. On the downside, Fixa is clearly developer-focused and requires careful setup. Yet for a team productionizing an AI voice agent, it is an almost essential tool to harden the product and prevent surprises in production. Its growing traction reflects a real market need.
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FAQ
What is Fixa?
An open-source platform for testing and observability of AI voice agents.
How does Fixa test a voice agent?
Fixa triggers real calls with another voice agent then uses an LLM to evaluate the conversation.
Is Fixa free?
The code is open source. The cloud platform uses a pay-as-you-go model with a free plan to get started.
Can I integrate Fixa into a CI pipeline?
Yes, Fixa tests can be triggered via GitHub Actions, an API or directly from the UI.
Which metrics does Fixa provide?
Latency, interruptions, accuracy of collected information, LLM scores and Slack alerts on regressions.