Basalt: AI Agent Building and Evaluation Platform

Basalt is a comprehensive end-to-end platform designed for building, evaluating, monitoring, and improving AI agents. The platform helps teams create trustworthy AI features by providing tools for prompt engineering, testing, and deployment, enabling organizations to ship AI agents that users can rely on.

Description Rewrite

Basalt is an end-to-end platform that empowers teams to build, evaluate, monitor, and improve AI agents. The platform offers a no-code playground for prompt engineering with AI-powered guidance, comprehensive testing tools with evaluators and test case generation, seamless deployment via SDK, and production monitoring capabilities-all designed to help organizations create AI features that users can trust.

Deep Service Report

Basalt addresses the significant challenge many organizations face when implementing AI features: bridging the gap between promising demos and reliable production-ready AI systems. The platform recognizes that creating effective AI features requires collaboration between product managers, domain experts, and engineers, while demanding rapid iteration and testing. At its core, Basalt provides a sophisticated AI playground that facilitates prompt engineering and testing. Users can prototype quickly using a no-code interface, drafting prompts with co-pilot guidance and structured sections. The platform supports iterative development through version management and multi-model testing, allowing teams to compare different approaches and refine their AI features. A key strength of Basalt lies in its evaluation capabilities. Users can test their prompts against realistic scenarios by uploading existing datasets or having Basalt generate test cases. The platform includes over 50 AI evaluator templates to identify potential issues and ensure quality output across diverse scenarios. This systematic testing builds confidence in the AI feature before deployment. Once testing is complete, Basalt offers seamless deployment through its SDK, which abstracts prompts and integrates them directly into the user’s codebase. The platform continues to provide value post-deployment with production monitoring tools that capture logs, track usage patterns, and alert teams to new errors or edge cases. This comprehensive approach significantly accelerates the development cycle for AI features, allowing teams to move from concept to production-ready implementation up to 10 times faster than traditional methods. By providing structured workflows and tools specifically designed for AI development, Basalt helps organizations overcome the unique challenges of creating reliable AI features. The platform is particularly valuable for product managers looking to integrate AI capabilities without extensive coding knowledge, though it serves the entire AI development team with its collaborative features and technical capabilities.

Country

United States (San Francisco, California)

Pros & Cons

Pros

No-code playground makes AI feature development accessible to non-technical team members
AI-powered co-pilot provides guidance and improvement suggestions for prompts
Comprehensive testing with 50+ evaluator templates ensures quality and reliability
Seamless deployment via SDK simplifies integration into existing codebases
Production monitoring helps identify and address issues in real-world usage
Collaborative workflow supports cross-functional team participation
Multi-model support allows testing across different AI providers

Cons

Pricing for Pro plan is not transparently listed (custom quotes only)
Relatively new platform launched in early 2025, with limited proven track record
Learning curve may exist for teams new to AI development practices
Depends on third-party AI models, inheriting their limitations
May require integration work for complex enterprise environments

Pricing

Basalt offers a tiered pricing structure:

Free Plan: Available with limited features, suitable for exploration and small-scale projects
Pro Plan: Custom pricing based on usage requirements and features needed

No specific pricing figures are publicly available for the Pro plan, requiring interested customers to contact the company for a custom quote.

Competitor Comparison

Feature	Basalt	Lisapet.ai	Vellum AI	PromptPerfect
Primary Focus	AI agent building \& evaluation	AI prompt testing	LLM prompt engineering \& testing	Prompt optimization
No-code Interface	Yes	Yes	Yes	Yes
AI Co-pilot	Yes	No	Partial	Yes
Test Case Generation	Yes	Yes	Partial	No
Production Monitoring	Yes	Limited	Yes	No
SDK Integration	Yes	Yes	Yes	Limited
Multi-model Support	Yes	Yes	Yes	Yes
Starting Price	Free plan available	Not specified	Not specified	\$8.33/month
Target Audience	Product managers, developers	Product managers, designers, AI engineers	Developers	Prompt engineers

Team Members

Francois de Fitte – Co-founder
Guillaume Marquis – Founder \& CTO
Alexis d’Eudeville – Co-founder
Theophile Cousin – Founding Engineer
Quentin Le Gall – Leading GTM (Go-to-Market)
Victor Gross – Team member
Nic Touron – Team member
Matthieu Vaxelaire – Team member
Meghan Regior – Team member
Calliste Duru – Team member

Team Members About

Francois de Fitte: Previously co-founded Popchef, a digital canteen service. He was recognized in Forbes 30 Under 30 for Arts and Culture in 2019. His educational background includes King’s College London (Law), Université Paris-Sorbonne (Law), HEC Paris (Entrepreneurship), and Sciences Po Paris (Marketing).
Guillaume Marquis: Serves as Founder \& CTO at Basalt, focusing on helping teams go from idea to ready-to-deploy AI features in hours. He has a background in technical leadership and software development, with education from Heriot-Watt University.
Alexis d’Eudeville: Author of the e-book “Building with AI: The Product Handbook.” He has experience as a 3x founder and previously worked at Google. He is focused on helping product builders develop effective AI products.

Team Members SNS Links

Francois de Fitte: LinkedIn – https://fr.linkedin.com/in/francoisdefitte
Guillaume Marquis: LinkedIn – https://www.linkedin.com/in/marquis-guillaume
Alexis d’Eudeville: LinkedIn – https://www.linkedin.com/in/alexis-d-eudeville-348bb858
Basalt Company Page: LinkedIn – https://www.linkedin.com/company/basalt-ai
Official Website: https://www.getbasalt.ai

Final Thoughts

Basalt presents a compelling solution for organizations seeking to build, evaluate, and deploy reliable AI agents. Its no-code interface, robust testing tools, and real-time monitoring capabilities make it a valuable asset for teams of all sizes. While the platform is still relatively new, its comprehensive feature set and collaborative workflow tools position it as a strong contender in the AI agent development space. If you’re looking for a platform to streamline your AI development process and ensure the quality of your AI agents, Basalt is definitely worth considering.