Open Source Humanloop Alternative for LLM Testing and Evaluation

Trusted by AI innovators & global enterprises

How LangWatch compares to Humanloop

Agent simulation testing

Advanced simulation framework that tests multi-modal agents through complex multi-turn scenarios with API calls, tool usage, and state management validation.

Open-source platform

Transparent codebase with unlimited deployment flexibility and complete control over data processing, security policies, and feature development.

Native OpenTelemetry support

Built-in OpenTelemetry integration provides standardized tracing, metrics, and logging across all supported frameworks without additional configuration overhead.

Flexible evaluation framework

Dual-interface approach with powerful Python and TypeScript APIs for complex evaluation logic alongside intuitive UI for domain experts to create scenarios and assess outputs efficiently.

Automated prompt optimization

DSPy integration with optimization algorithms that systematically improve prompt performance through automated generation, testing, and selection of variants.

Single-turn evaluation platform

Traditional evaluation platform focused on single input-output pairs with limited support for complex agent workflows and multi-step interactions.

Proprietary SaaS solution

Closed-source platform with restricted customization options and dependency on vendor-controlled infrastructure and feature roadmap decisions.

Custom instrumentation required

Requires proprietary SDK integration and custom instrumentation setup, limiting interoperability with existing observability infrastructure and monitoring tools.

GUI-based evaluation workflows

Platform-centric evaluation workflows designed primarily for manual testing and GUI-based configuration with limited programmatic automation capabilities.

Manual prompt management

Manual prompt versioning and A/B testing capabilities requiring human intervention for optimization decisions and performance improvement iterations across different model configurations.

What makes LangWatch different?

Agent simulations

Multi-turn agent simulation framework tests complex multi-modal workflows and API integrations before deployment, beyond traditional evaluation methods.

No vendor dependency risk

Self-hosted deployment options eliminate platform discontinuation risks and acquisition-driven shutdowns that can disrupt critical AI operations.

No vendor dependency risk

Self-hosted deployment options eliminate platform discontinuation risks and acquisition-driven shutdowns that can disrupt critical AI operations.

No vendor dependency risk

Self-hosted deployment options eliminate platform discontinuation risks and acquisition-driven shutdowns that can disrupt critical AI operations.

DSPy native

DSPy-powered optimization engine automatically improves prompt performance through systematic experimentation and algorithmic refinement techniques.

DSPy native

DSPy-powered optimization engine automatically improves prompt performance through systematic experimentation and algorithmic refinement techniques.

DSPy native

DSPy-powered optimization engine automatically improves prompt performance through systematic experimentation and algorithmic refinement techniques.

Discover LangWatch

Try LangWatch yourself or book some time with an expert to help you get set up.

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Talk to an Expert

David Nicol
CTO - Productive Healthy Work Lives
“LangWatch didn’t just help us optimize our AI, it fundamentally changed how we work. Now, everyone on our team, from engineers to coaching experts, can contribute to building a better AI coach."
David Nicol
Amit Huli
Head of AI - Roojoom
“When I saw LangWatch for the first time, it reminded me of how we used to evaluate models in classic machine learning. I knew this was exactly what we needed to maintain our high standards at enterprise scale"
Amit Huli
Lane Cunmmingham
VP engineering - GetGenetica - Flora AI
“LangWatch has brought us our monitoring and evaluations with an intuitive analytics dashboard. The Optimization Studio with DSPy brings the kind of progress we were hoping for as a partner."
Lane Cunmmingham
Kjeld O
AI Architect, Entropical AI agency
"I’ve seen a lot of LLMops tools and LangWatch is solving a problem that everyone building with AI will have when going to production. The best part is their product is so easy to use."
Kjeld O
David Nicol
CTO - Productive Healthy Work Lives
“LangWatch didn’t just help us optimize our AI, it fundamentally changed how we work. Now, everyone on our team, from engineers to coaching experts, can contribute to building a better AI coach."
David Nicol
Amit Huli
Head of AI - Roojoom
“When I saw LangWatch for the first time, it reminded me of how we used to evaluate models in classic machine learning. I knew this was exactly what we needed to maintain our high standards at enterprise scale"
Amit Huli
Lane Cunmmingham
VP engineering - GetGenetica - Flora AI
“LangWatch has brought us our monitoring and evaluations with an intuitive analytics dashboard. The Optimization Studio with DSPy brings the kind of progress we were hoping for as a partner."
Lane Cunmmingham
Kjeld O
AI Architect, Entropical AI agency
"I’ve seen a lot of LLMops tools and LangWatch is solving a problem that everyone building with AI will have when going to production. The best part is their product is so easy to use."
Kjeld O
David Nicol
CTO - Productive Healthy Work Lives
“LangWatch didn’t just help us optimize our AI, it fundamentally changed how we work. Now, everyone on our team, from engineers to coaching experts, can contribute to building a better AI coach."
David Nicol
Amit Huli
Head of AI - Roojoom
“When I saw LangWatch for the first time, it reminded me of how we used to evaluate models in classic machine learning. I knew this was exactly what we needed to maintain our high standards at enterprise scale"
Amit Huli
Lane Cunmmingham
VP engineering - GetGenetica - Flora AI
“LangWatch has brought us our monitoring and evaluations with an intuitive analytics dashboard. The Optimization Studio with DSPy brings the kind of progress we were hoping for as a partner."
Lane Cunmmingham
Kjeld O
AI Architect, Entropical AI agency
"I’ve seen a lot of LLMops tools and LangWatch is solving a problem that everyone building with AI will have when going to production. The best part is their product is so easy to use."
Kjeld O
David Nicol
CTO - Productive Healthy Work Lives
“LangWatch didn’t just help us optimize our AI, it fundamentally changed how we work. Now, everyone on our team, from engineers to coaching experts, can contribute to building a better AI coach."
David Nicol
Amit Huli
Head of AI - Roojoom
“When I saw LangWatch for the first time, it reminded me of how we used to evaluate models in classic machine learning. I knew this was exactly what we needed to maintain our high standards at enterprise scale"
Amit Huli
Lane Cunmmingham
VP engineering - GetGenetica - Flora AI
“LangWatch has brought us our monitoring and evaluations with an intuitive analytics dashboard. The Optimization Studio with DSPy brings the kind of progress we were hoping for as a partner."
Lane Cunmmingham
Kjeld O
AI Architect, Entropical AI agency
"I’ve seen a lot of LLMops tools and LangWatch is solving a problem that everyone building with AI will have when going to production. The best part is their product is so easy to use."
Kjeld O

David Nicol
CTO - Productive Healthy Work Lives
“LangWatch didn’t just help us optimize our AI, it fundamentally changed how we work. Now, everyone on our team, from engineers to coaching experts, can contribute to building a better AI coach."
David Nicol
Amit Huli
Head of AI - Roojoom
“When I saw LangWatch for the first time, it reminded me of how we used to evaluate models in classic machine learning. I knew this was exactly what we needed to maintain our high standards at enterprise scale"
Amit Huli
Lane Cunmmingham
VP engineering - GetGenetica - Flora AI
“LangWatch has brought us our monitoring and evaluations with an intuitive analytics dashboard. The Optimization Studio with DSPy brings the kind of progress we were hoping for as a partner."
Lane Cunmmingham
Kjeld O
AI Architect, Entropical AI agency
"I’ve seen a lot of LLMops tools and LangWatch is solving a problem that everyone building with AI will have when going to production. The best part is their product is so easy to use."
Kjeld O
David Nicol
CTO - Productive Healthy Work Lives
“LangWatch didn’t just help us optimize our AI, it fundamentally changed how we work. Now, everyone on our team, from engineers to coaching experts, can contribute to building a better AI coach."
David Nicol
Amit Huli
Head of AI - Roojoom
“When I saw LangWatch for the first time, it reminded me of how we used to evaluate models in classic machine learning. I knew this was exactly what we needed to maintain our high standards at enterprise scale"
Amit Huli
Lane Cunmmingham
VP engineering - GetGenetica - Flora AI
“LangWatch has brought us our monitoring and evaluations with an intuitive analytics dashboard. The Optimization Studio with DSPy brings the kind of progress we were hoping for as a partner."
Lane Cunmmingham
Kjeld O
AI Architect, Entropical AI agency
"I’ve seen a lot of LLMops tools and LangWatch is solving a problem that everyone building with AI will have when going to production. The best part is their product is so easy to use."
Kjeld O
David Nicol
CTO - Productive Healthy Work Lives
“LangWatch didn’t just help us optimize our AI, it fundamentally changed how we work. Now, everyone on our team, from engineers to coaching experts, can contribute to building a better AI coach."
David Nicol
Amit Huli
Head of AI - Roojoom
“When I saw LangWatch for the first time, it reminded me of how we used to evaluate models in classic machine learning. I knew this was exactly what we needed to maintain our high standards at enterprise scale"
Amit Huli
Lane Cunmmingham
VP engineering - GetGenetica - Flora AI
“LangWatch has brought us our monitoring and evaluations with an intuitive analytics dashboard. The Optimization Studio with DSPy brings the kind of progress we were hoping for as a partner."
Lane Cunmmingham
Kjeld O
AI Architect, Entropical AI agency
"I’ve seen a lot of LLMops tools and LangWatch is solving a problem that everyone building with AI will have when going to production. The best part is their product is so easy to use."
Kjeld O
David Nicol
CTO - Productive Healthy Work Lives
“LangWatch didn’t just help us optimize our AI, it fundamentally changed how we work. Now, everyone on our team, from engineers to coaching experts, can contribute to building a better AI coach."
David Nicol
Amit Huli
Head of AI - Roojoom
“When I saw LangWatch for the first time, it reminded me of how we used to evaluate models in classic machine learning. I knew this was exactly what we needed to maintain our high standards at enterprise scale"
Amit Huli
Lane Cunmmingham
VP engineering - GetGenetica - Flora AI
“LangWatch has brought us our monitoring and evaluations with an intuitive analytics dashboard. The Optimization Studio with DSPy brings the kind of progress we were hoping for as a partner."
Lane Cunmmingham
Kjeld O
AI Architect, Entropical AI agency
"I’ve seen a lot of LLMops tools and LangWatch is solving a problem that everyone building with AI will have when going to production. The best part is their product is so easy to use."
Kjeld O

David Nicol
CTO - Productive Healthy Work Lives
“LangWatch didn’t just help us optimize our AI, it fundamentally changed how we work. Now, everyone on our team, from engineers to coaching experts, can contribute to building a better AI coach."
David Nicol
Amit Huli
Head of AI - Roojoom
“When I saw LangWatch for the first time, it reminded me of how we used to evaluate models in classic machine learning. I knew this was exactly what we needed to maintain our high standards at enterprise scale"
Amit Huli
Lane Cunmmingham
VP engineering - GetGenetica - Flora AI
“LangWatch has brought us our monitoring and evaluations with an intuitive analytics dashboard. The Optimization Studio with DSPy brings the kind of progress we were hoping for as a partner."
Lane Cunmmingham
Kjeld O
AI Architect, Entropical AI agency
"I’ve seen a lot of LLMops tools and LangWatch is solving a problem that everyone building with AI will have when going to production. The best part is their product is so easy to use."
Kjeld O
David Nicol
CTO - Productive Healthy Work Lives
“LangWatch didn’t just help us optimize our AI, it fundamentally changed how we work. Now, everyone on our team, from engineers to coaching experts, can contribute to building a better AI coach."
David Nicol
Amit Huli
Head of AI - Roojoom
“When I saw LangWatch for the first time, it reminded me of how we used to evaluate models in classic machine learning. I knew this was exactly what we needed to maintain our high standards at enterprise scale"
Amit Huli
Lane Cunmmingham
VP engineering - GetGenetica - Flora AI
“LangWatch has brought us our monitoring and evaluations with an intuitive analytics dashboard. The Optimization Studio with DSPy brings the kind of progress we were hoping for as a partner."
Lane Cunmmingham
Kjeld O
AI Architect, Entropical AI agency
"I’ve seen a lot of LLMops tools and LangWatch is solving a problem that everyone building with AI will have when going to production. The best part is their product is so easy to use."
Kjeld O
David Nicol
CTO - Productive Healthy Work Lives
“LangWatch didn’t just help us optimize our AI, it fundamentally changed how we work. Now, everyone on our team, from engineers to coaching experts, can contribute to building a better AI coach."
David Nicol
Amit Huli
Head of AI - Roojoom
“When I saw LangWatch for the first time, it reminded me of how we used to evaluate models in classic machine learning. I knew this was exactly what we needed to maintain our high standards at enterprise scale"
Amit Huli
Lane Cunmmingham
VP engineering - GetGenetica - Flora AI
“LangWatch has brought us our monitoring and evaluations with an intuitive analytics dashboard. The Optimization Studio with DSPy brings the kind of progress we were hoping for as a partner."
Lane Cunmmingham
Kjeld O
AI Architect, Entropical AI agency
"I’ve seen a lot of LLMops tools and LangWatch is solving a problem that everyone building with AI will have when going to production. The best part is their product is so easy to use."
Kjeld O
David Nicol
CTO - Productive Healthy Work Lives
“LangWatch didn’t just help us optimize our AI, it fundamentally changed how we work. Now, everyone on our team, from engineers to coaching experts, can contribute to building a better AI coach."
David Nicol
Amit Huli
Head of AI - Roojoom
“When I saw LangWatch for the first time, it reminded me of how we used to evaluate models in classic machine learning. I knew this was exactly what we needed to maintain our high standards at enterprise scale"
Amit Huli
Lane Cunmmingham
VP engineering - GetGenetica - Flora AI
“LangWatch has brought us our monitoring and evaluations with an intuitive analytics dashboard. The Optimization Studio with DSPy brings the kind of progress we were hoping for as a partner."
Lane Cunmmingham
Kjeld O
AI Architect, Entropical AI agency
"I’ve seen a lot of LLMops tools and LangWatch is solving a problem that everyone building with AI will have when going to production. The best part is their product is so easy to use."
Kjeld O