Best Free AI Observability Tools in 2026

The AI & Agent Engineering Platform for LLM observability, evaluation, and development.

4.3/5 on G2 · 48 ratings, Sep 2026

Arize AI is a comprehensive platform designed for building, evaluating, and improving AI agents and applications, particularly focusing on Large Language Models (LLMs). It provides a unified environment for AI development, observability, and evaluation, enabling teams to iterate faster and ship reliable AI. The platform helps close the loop between AI development and production by using real production data to power better development and aligning production observability with trusted evaluations. Arize AI caters to AI product managers, engineers, and data scientists by offering tools for prompt optimization, LLM-as-a-Judge evaluations, human annotation, and real-time monitoring. It helps detect prompt and agent regressions early, pinpoint model failures, analyze critical data patterns, and address model drift. The platform is built on open standards like OpenTelemetry and offers an open-source evaluation library, ensuring transparency and interoperability with existing tech stacks. It also includes Alyx, an AI teammate for LLM application development, to assist with debugging and knowledge sharing.

Monitor cloud and on-prem environments with full data, lower costs, and complete control.

4.8/5 on G2 · 26 ratings, Sep 2026

Groundcover is an observability platform designed for cloud-native and on-premise environments, offering comprehensive monitoring capabilities for infrastructure, applications, and even LLM-powered applications. It aims to provide 10x more data at a fraction of the cost compared to traditional SaaS solutions by leveraging a Bring Your Own Cloud (BYOC) architecture. This means all observability data is processed and stored within the user's Virtual Private Cloud (VPC), ensuring data privacy, security, and residency. The platform utilizes eBPF-powered sensors for instant, zero-instrumentation deployment, collecting enriched telemetry across the entire stack without requiring code changes. It integrates logs, traces, and metrics automatically, providing complete visibility and context for engineers. Groundcover targets teams that require full data fidelity, predictable flat pricing based on hosts rather than data ingestion, and the flexibility to run their observability solution anywhere, from major cloud providers to regulated environments and on-prem data centers.

Production stack for Gen AI builders: AI Gateway, Observability, Guardrails, Governance, and Prompt Management.

4.6/5 on G2 · 18 ratings, Sep 2026

Portkey provides a comprehensive production stack for AI teams building with Large Language Models (LLMs). It offers an AI Gateway for unified access to over 1600 LLMs, enabling teams to connect, manage, and secure AI interactions with features like smart routing, caching, and key management. This gateway helps optimize costs, ensure reliability, and simplify integration across various models and providers. Beyond the gateway, Portkey includes robust observability tools to monitor LLM behavior, detect anomalies, and manage usage proactively with real-time dashboards. It also features guardrails for keeping AI outputs in check, governance capabilities for security and access control, and prompt management for creating, testing, and versioning prompts. Portkey is designed for developers and AI teams looking to move their Gen AI applications from prototyping to production efficiently and reliably.

The AI observability and evaluation platform to stop AI failures before they happen.

4.4/5 on G2 · 17 ratings, Mar 2026

Galileo AI is an end-to-end platform for AI evaluation, observability, and real-time protection, designed to help developers and enterprises ship AI applications with confidence. It addresses the challenge of measuring AI accuracy both offline during development and online in production. The platform allows users to build and manage datasets, create accurate evaluations with auto-tuned metrics, and transform these evaluations into production guardrails. It provides over 20 out-of-the-box evaluators for RAG, agents, safety, and security, alongside tools to build custom evaluators. Galileo's insights engine helps debug AI systems by identifying failure modes, surfacing patterns, and prescribing fixes. It also offers real-time protection by blocking harmful outputs and security risks, and continuously improves prompts with user and subject-matter expert feedback. The platform is suitable for developers and small teams experimenting with AI, as well as enterprises requiring scalable, secure, and premium support for their AI deployments.

Ship AI agents faster with integrated prompt engineering and simulation

Maxim AI is a comprehensive platform designed to help teams rapidly and reliably ship AI agents. It provides an integrated environment for prompt engineering, agent simulation, evaluation, and real-time observability. The platform enables users to iterate on prompts, models, and tools without code changes, manage prompt versions, and build complex AI workflows in a low-code environment. It also supports one-click deployment with custom rules. Maxim AI is built for AI development teams, product managers, and engineers who need to ensure the quality, performance, and safety of their AI applications. It helps accelerate the AI development lifecycle by providing tools for automated testing, continuous quality monitoring, and detailed reporting. The platform integrates seamlessly with CI/CD workflows and supports various AI providers, offering SDKs, CLI, and webhook support for flexible integration into existing development stacks.

The full lifecycle platform for evaluating and shipping reliable AI agents fast.

Arthur AI provides a comprehensive platform designed to help organizations build, deploy, and monitor reliable AI agents and models. It addresses the challenges of AI project success by offering continuous evaluation capabilities across the entire AI lifecycle, ensuring visibility and reliability. The platform integrates built-in guardrails to protect AI applications from misuse and off-brand interactions, enhancing security and brand consistency. Arthur AI is model-agnostic, supporting traditional machine learning, Generative AI, and agentic systems, making it versatile for various AI use cases. It offers flexible deployment options including SaaS, on-premise, and direct integration with GCP or AWS, catering to diverse infrastructure needs. The platform aims to reduce maintenance workloads and accelerate the implementation of production models. Arthur AI is ideal for enterprise AI teams, AI-native startups, and organizations looking to ensure the reliability, performance, and security of their AI deployments. It provides tools for monitoring model performance, managing prompts, running experiments, and conducting continuous evaluations, ultimately helping teams ship AI that works consistently and prevents unwanted outputs.

Build reliable AI apps with Helicone: AI Gateway & LLM Observability for debugging, routing, and analysis.

Helicone is an AI Gateway and LLM Observability platform designed to help companies build, debug, and analyze their AI applications. It provides tools to route requests, identify and fix issues, and gain insights into application performance. Helicone aims to make AI development more reliable and efficient for fast-growing AI companies. The platform offers features like request monitoring, usage-based billing, caching, rate limits, automatic fallbacks, and data retention. It also includes advanced capabilities for prompts and testing, such as a playground, scores, and datasets. Helicone is built to scale with teams of all sizes, from individual developers to large enterprises, offering various plans with increasing features and support. Helicone is ideal for developers, teams, and enterprises working with AI applications who need robust tools for observability, performance optimization, and compliance. It helps users understand AI performance bottlenecks, save time on debugging, and ensure their AI products are reliable and scalable.

Build reliable AI systems with best-in-class LLM evaluation and observability.

Confident AI is an LLM evaluation and observability platform built by the creators of DeepEval, an open-source LLM evaluation framework. It enables engineers, QA teams, and product leaders to build reliable AI by providing tools to benchmark, monitor, and debug LLM systems. The platform helps users curate datasets, align metrics, and automate LLM testing with tracing, aiming to safeguard AI systems, reduce inference costs, and ensure continuous improvement. The platform offers end-to-end evaluation to measure prompt and model performance, regression testing to mitigate breaking changes in CI/CD pipelines, and component-level evaluation for dissecting and debugging LLM pipelines. For observability, it provides real-time monitoring, A/B testing capabilities for LLM applications, flexible tracing for debugging, and tools to collect user feedback to identify unsatisfactory interactions. Confident AI integrates with DeepEval, allowing for easy evaluation setup and providing intuitive product analytic dashboards for both technical and non-technical team members. Confident AI is designed for teams looking to ensure the quality, reliability, and performance of their LLM applications in production. It helps prevent regressions, optimize models and prompts, and gain deep insights into LLM behavior, ultimately saving development time and improving user experience.

The #1 AI engineering platform to stress-test your AI agents pre- and in production.

LangWatch is an AI agent engineering platform designed to help teams build, evaluate, deploy, monitor, and optimize AI agents with confidence. It provides a continuous quality loop for AI systems, enabling engineers and domain experts to define evaluations, run experiments, simulate AI agents, and monitor production behavior. This platform is crucial for teams looking to move beyond guesswork in AI development and ensure their AI products are reliable and perform as expected in real-world scenarios. The platform caters to AI developers and teams, from fast-moving startups to large enterprises, who are building complex AI applications, including those involving RAG, multimodal agents, and multi-turn conversations. LangWatch aims to reduce the fragility and opacity often associated with AI systems by offering tools for prompt and model management, LLM observability, agent simulations, batch testing, and human-in-the-loop feedback. It helps teams ship AI systems with confidence, improve them with every release, and focus on strategy and creativity by ensuring AI behaves as expected.

Open Source LLM Engineering Platform for debugging and improving your LLM application.

Langfuse is an open-source LLM engineering platform designed to help developers debug, evaluate, and improve their large language model (LLM) applications. It provides comprehensive observability features, including traces, evaluations, prompt management, and metrics, allowing users to inspect failures and build evaluation datasets. The platform integrates with popular LLM/agent libraries and is based on OpenTelemetry. Langfuse is ideal for developers and teams building and deploying LLM-powered applications, from hobby projects to large-scale enterprise solutions. It offers tools for prompt versioning, experimentation, and caching, along with robust evaluation capabilities including LLM-as-judge evaluators and human annotation. Key benefits include faster debugging, data-driven improvement of LLM performance, and streamlined prompt management, ultimately leading to more reliable and effective AI applications.

Evaluate and monitor your AI systems for safety, reliability, and performance.

Evidently AI provides an AI evaluation and LLM observability platform built on the open-source Evidently framework. It helps teams ensure their AI models, especially LLMs, are safe, reliable, and performant through automated evaluation, synthetic data generation, and continuous testing. The platform addresses common AI failures like hallucinations, edge cases, data leaks, and cascading errors by offering over 100 built-in metrics and the ability to design custom evaluation systems. The platform is designed for AI product teams, ML platform engineers, and AI governance leaders who need to rigorously test and monitor their AI applications. It supports various use cases, including adversarial testing, RAG evaluation, AI agent validation, and predictive system monitoring. Beyond the core platform, Evidently AI also offers advisory services, training, and masterclasses to help organizations implement robust LLM evaluation workflows and manage AI risks effectively.

Cut AI costs, monitor performance, and optimize usage

Vigil is a proxy between your app and your AI providers. Change one URL and see what every agent costs, where it errors and how fast it responds, while Vigil cuts the bill through caching, routing and history trimming.

The complete LLM control plane for scaling AI products with reliability and confidence.

Latitude provides an AI reliability platform designed to help teams build and scale production-ready LLM applications. It offers a comprehensive control plane that addresses common challenges in AI development, such as behavior drift, unexpected product breaks from prompt changes, and difficulty in identifying failure points. The platform is built for AI engineering teams and developers who need to ensure the stability, performance, and cost-efficiency of their LLM-powered products. It enables faster prompt iteration, reduces critical errors in production, and improves AI model accuracy by providing tools for observability, human feedback, failure discovery, evaluation, and experimentation. Latitude aims to transform production failures into clear signals for fixes, allowing teams to ship AI products with greater confidence. Key benefits include significantly fewer critical errors reaching production, faster prompt iteration using techniques like GEPA, and a measurable increase in AI accuracy within weeks. It helps teams move from hoping their AI system works to having a reliable, observable, and continuously improving AI product.

Evaluate and monitor the quality of your LLM applications with automatic metrics and synthetic data.

Ragas is an open-source framework designed for evaluating the performance and robustness of Large Language Model (LLM) applications, particularly those leveraging Retrieval Augmented Generation (RAG) systems. It provides a suite of automatic metrics to assess various aspects of RAG quality, such as faithfulness, answer relevancy, context precision, and context recall. This allows developers to understand how well their LLM applications are performing and identify areas for improvement. The platform also offers the capability to synthetically generate high-quality and diverse evaluation data tailored to specific application requirements. This addresses the challenge of acquiring sufficient and relevant test data for LLM evaluation. Furthermore, Ragas supports online monitoring, enabling continuous evaluation of LLM applications in production environments to ensure ongoing quality and provide actionable insights for iterative enhancement. It is built by a team with expertise in applied AI research and is integrated with popular LLM frameworks like LlamaIndex and LangChain.

The comprehensive LLM evaluation framework for building reliable AI applications.

DeepEval is an open-source LLM evaluation framework designed to help developers build and test reliable AI systems. It provides a robust set of tools for evaluating large language models (LLMs) and other AI components, integrating seamlessly into existing development workflows, particularly with Python's Pytest. The framework offers a wide array of research-backed metrics, including advanced techniques like G-Eval, DAGA, and QAG, to provide nuanced and objective scoring for various AI use cases. It supports both single and multi-turn evaluations, handles multi-modal data (text, images, audio), and can even generate synthetic test data to address a lack of real-world examples. DeepEval is built for production-grade standards and integrates with popular AI stacks like OpenAI, LangChain, and Anthropic, making it suitable for enterprises and individual developers focused on ensuring the quality and reliability of their AI applications. For team-wide collaboration and advanced features like regression testing, AI experiments, and online monitoring, DeepEval can be used on Confident AI, a cloud-based LLM evaluation platform developed by the creators of DeepEval.