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Fixa.dev Review

Fixa.dev is a dual-purpose AI platform that functions as an open-source voice agent observability and testing solution, and as a cloud-native AI agent for autonomous software development.

shipped Apr 19, 2026freemium
Monthly visits1/mo
Fixa.dev - AI tool for fixa. Professional illustration showing core functionality and features.

Why it matters

1Fixa.dev launched an open-source Python package for voice agent testing on January 21, 2025.
2The AI software builder component of Fixa.dev launched on Product Hunt on April 19, 2026.
3Voice agent observability is offered via a 'Pay As You Go' plan at $0.03 per minute.
4The platform integrates with frontier AI models, including Gemini 3 Flash.

Stork’s verdict on Fixa.dev

Fixa.dev provides comprehensive voice agent observability, but its autonomous software development aspect feels like a separate tool.

Fixa.dev reviewed by Stork AI · stork.ai/en/fixa-dev

Specs

API Available

Yes, public API

overview

What is Fixa.dev?

Fixa.dev is an AI software development and voice agent observability platform developed by Fixa.dev (founded by Oliver Wendell-Braly and Luan Nguyen) that enables developers and teams building, deploying, or maintaining AI voice agents and general software applications to build full-stack applications, APIs, and workflows, and to monitor, debug, and improve AI-powered voice agents. It operates as both an open-source voice agent observability platform and a cloud-native AI agent for autonomous software construction.

features

Key Features of Fixa.dev

Fixa.dev provides a comprehensive suite of features catering to both autonomous software development and AI voice agent management. Its AI agent capabilities allow for the generation of production-ready software components, while its observability platform offers detailed insights into voice agent performance. The platform leverages advanced AI models like Gemini 3 Flash to power its functionalities.

  • Build full-stack applications autonomously from idea to production.
  • Develop APIs and workflows using an AI agent.
  • Monitor AI voice agents for critical metrics such as Time to First Word (TTFW) and percentile latencies (p50/p90/p95).
  • Debug AI voice agents by detecting and analyzing user interruptions during conversations.
  • Test AI voice agents through both simulation and real-call monitoring.
  • Ensure correctness of voice agent responses via customizable evaluation frameworks.
  • Provide real-time alerts for performance or correctness issues, with Slack integration.
  • Enable software development tasks with no coding required.
  • Utilize a Command Palette for streamlined interaction and control.
  • Offer an open-source Python package for automated testing of voice AI systems.

use cases

Who Should Use Fixa.dev?

Fixa.dev is designed for a diverse set of users, primarily targeting developers and teams involved in the lifecycle of AI-powered systems. Its dual functionality addresses the needs of those building new software applications autonomously and those managing the operational performance of AI voice agents in production environments.

  • Developers building, deploying, or maintaining AI voice agents who require robust observability, testing, and debugging tools.
  • Teams needing to build full-stack applications, APIs, or workflows from concept to production, leveraging an autonomous AI agent to minimize manual coding.
  • Voice AI developers aiming to improve agent responsiveness, reduce conversational latency, and minimize user interruptions.
  • Organizations requiring real-time monitoring and alerting for production voice agent performance and correctness issues.

pricing

Fixa.dev Pricing & Plans

Fixa.dev operates on a freemium model, offering different plans tailored to its distinct functionalities. The voice agent observability and testing platform provides a usage-based option, while the AI software builder includes a tiered subscription. Enterprise-level solutions are available for larger organizations requiring custom features and compliance.

  • Free: Provides access to basic features for both voice agent observability and software building.
  • Pay As You Go (Voice Agent Observability): Priced at $0.03 per minute, includes Discord support and 10 free calls for new users.
  • Upgrade Plan (Software Builder): A paid tier that unlocks all features and provides additional credits for autonomous software development.
  • Enterprise (Voice Agent Observability): Custom pricing for larger organizations, including volume discounts, custom integrations, priority support, and compliance with SOC 2 & HIPAA standards.

Similar Tools

Fixa.dev vs Competitors

Fixa.dev occupies a unique position in the AI tools landscape due to its dual focus on autonomous software building and specialized voice agent observability. While it competes with various platforms in each domain, its integrated approach and specific technical differentiators set it apart.

1
CodeFusion AI↗

CodeFusion AI instantly generates professional full-stack websites using AI, automating frontend, backend, and database creation in minutes without coding.

Similar to Fixa.dev in its aim to generate full-stack applications from an idea, CodeFusion AI specifically emphasizes a no-code approach for website generation, potentially offering a faster initial build for web-focused projects.

2
Replit AIOn Stork

Replit AI provides a cloud-based IDE with AI agents that build, deploy, and host full applications (frontend, backend, database, authentication) directly from natural language prompts.

Replit AI offers a comprehensive, integrated development and deployment environment, aligning with Fixa.dev's 'idea to production' scope, but within an online IDE context that supports collaborative development.

3
OpenHands (formerly OpenDevin)↗

OpenHands is an AI software engineering agent capable of autonomously taking on real codebase tasks, such as implementing features, fixing bugs, and drafting pull requests.

OpenHands focuses on an autonomous agent that directly interacts with and modifies a codebase to implement features and fix bugs, closely mirroring Fixa.dev's emphasis on a 'best agent on the web' for building real software, with a strong focus on code-level interaction.

4
Reflex↗

Reflex enables building production-ready web apps with AI-powered code generation, allowing developers to work with both UI and backend using 100% Python.

Reflex directly competes by offering AI-powered full-stack web app generation, particularly appealing to Python developers, whereas Fixa.dev's language focus isn't specified but implies broader applicability across technologies.

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