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AI Tool
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.
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.
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Fixa.dev at a Glance
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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.
quick facts
Quick Facts
| Attribute | Value |
|---|---|
| Developer | Fixa.dev |
| Business Model | Freemium / Hybrid |
| Pricing | Free tier available; Pay As You Go at $0.03/minute for voice agent observability; Paid 'Upgrade Plan' for software builder. |
| Platforms | Web, API |
| API Available | Yes |
| Integrations | Slack, Gemini 3 Flash |
| Founded | 2024 |
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.
- 1Build full-stack applications autonomously from idea to production.
- 2Develop APIs and workflows using an AI agent.
- 3Monitor AI voice agents for critical metrics such as Time to First Word (TTFW) and percentile latencies (p50/p90/p95).
- 4Debug AI voice agents by detecting and analyzing user interruptions during conversations.
- 5Test AI voice agents through both simulation and real-call monitoring.
- 6Ensure correctness of voice agent responses via customizable evaluation frameworks.
- 7Provide real-time alerts for performance or correctness issues, with Slack integration.
- 8Enable software development tasks with no coding required.
- 9Utilize a Command Palette for streamlined interaction and control.
- 10Offer 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.
- 1Developers building, deploying, or maintaining AI voice agents who require robust observability, testing, and debugging tools.
- 2Teams needing to build full-stack applications, APIs, or workflows from concept to production, leveraging an autonomous AI agent to minimize manual coding.
- 3Voice AI developers aiming to improve agent responsiveness, reduce conversational latency, and minimize user interruptions.
- 4Organizations 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.
- 1Free: Provides access to basic features for both voice agent observability and software building.
- 2Pay As You Go (Voice Agent Observability): Priced at $0.03 per minute, includes Discord support and 10 free calls for new users.
- 3Upgrade Plan (Software Builder): A paid tier that unlocks all features and provides additional credits for autonomous software development.
- 4Enterprise (Voice Agent Observability): Custom pricing for larger organizations, including volume discounts, custom integrations, priority support, and compliance with SOC 2 & HIPAA standards.
competitors
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 AI↗
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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Frequently Asked Questions
+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.
+Is Fixa.dev free?
Yes, Fixa.dev offers a free tier that provides access to basic features for both its voice agent observability and software building functionalities. For more advanced features or higher usage, paid plans are available, including a 'Pay As You Go' option for voice agent observability at $0.03 per minute and an 'Upgrade Plan' for the software builder.
+What are the main features of Fixa.dev?
Fixa.dev's main features include autonomous building of full-stack applications, APIs, and workflows; monitoring and debugging AI voice agents for latency, interruptions, and correctness; real-time alerting via Slack; an open-source Python package for voice agent testing; and a Command Palette for interaction. It leverages AI models like Gemini 3 Flash for its capabilities.
+Who should use Fixa.dev?
Fixa.dev is intended for developers and teams involved in building, deploying, or maintaining AI voice agents, as well as those seeking to autonomously build full-stack applications, APIs, or workflows from concept to production. It is particularly useful for voice AI developers focused on improving agent performance and for organizations requiring robust monitoring and testing for their AI systems.
+How does Fixa.dev compare to alternatives?
Fixa.dev differentiates itself by offering a dual solution: an autonomous AI agent for general software building and a specialized open-source platform for voice agent observability. Compared to CodeFusion AI, it offers broader software building capabilities beyond websites. Against Replit AI, it provides a cloud-native agent rather than an IDE-integrated one. Unlike OpenHands, Fixa.dev focuses on building new software from scratch, not just modifying existing codebases. For voice agent observability, it offers specific features like interruption detection and latency analysis that are often missing in generic monitoring solutions.