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LangSmith Alternatives

LangSmith is a unified DevOps platform for developing, collaborating, testing, deploying, and monitoring LLM applications.

LangSmith, part of LangChain, is a platform that provides tools for debugging, testing, evaluating, and managing prompts for LLM applications.

Explore 48 alternatives to LangSmith across 2 categories. Updated September 2026.

Top LangSmith alternatives at a glance

Klu. Collaborate on prompts, evaluate, and optimize LLM-powered Apps with Klu.
FinetuneDB. Capture production data, evaluate outputs collaboratively, and fine-tune your LLM's performance
Langfuse. Traces, evals, prompt management and metrics to debug and improve your LLM application.
Comet Opik. Comet provides an end-to-end model evaluation platform for AI developers.
Weights & Biases. ML experiment tracking, LLM observability, and evaluation platform for AI teams

Compare LangSmith with its alternatives

Product	Pricing Model	Free Tier	Open Source	Hosting	HQ
LangSmith	Freemium	✓	—	Cloud + Self-hosted	🇺🇸 United States
Klu	Freemium	✓	—	Cloud + Self-hosted	🇺🇸 United States
FinetuneDB	Freemium	—	—	Cloud	🇺🇸 United States
Langfuse	Freemium	✓	✓ MIT	Cloud + Self-hosted	🇩🇪 Germany
Comet Opik	Freemium	✓	✓ APACHE2	Cloud + Self-hosted	🇺🇸 United States
Weights & Biases	Freemium	✓	—	Cloud + Self-hosted	🇺🇸 United States
Arize AI	Freemium	✓	✓ ELASTIC-2.0	Cloud + Self-hosted	🇺🇸 United States
Traceloop	Freemium	✓	✓	Cloud + Self-hosted	🇺🇸 United States
Helicone	Freemium	✓	✓ APACHE2	Cloud + Self-hosted	🇺🇸 United States
Agenta	Freemium	✓	✓ MIT	Cloud + Self-hosted	🇩🇪 Germany
LangWatch	Freemium	✓	✓ MIT	Cloud + Self-hosted	🇳🇱 Netherlands
Log10	—	✓	—	—	🇺🇸 United States
Weckr	Freemium	✓	✓ MIT	Cloud	🇸🇪 Sweden
Laminar	Freemium	✓	✓	Cloud + Self-hosted	—
Sentrial	Freemium	✓	—	Cloud	🇺🇸 United States
Telemetry	Freemium	✓	—	Cloud	🇺🇸 United States

🧠 Fine-tuning

Klu

Collaborate on prompts, evaluate, and optimize LLM-powered Apps with Klu.

Free Trial

FinetuneDB

Capture production data, evaluate outputs collaboratively, and fine-tune your LLM's performance

📊 Observability & Analytics

Langfuse

Traces, evals, prompt management and metrics to debug and improve your LLM application.

Open Source Free Trial

Comet Opik

Comet provides an end-to-end model evaluation platform for AI developers.

Open Source Free Trial

Weights & Biases

ML experiment tracking, LLM observability, and evaluation platform for AI teams

Free Trial

Arize AI

AI observability platform with tracing, evaluation, and monitoring for LLM and ML applications

Open Source Free Trial

Traceloop

Open-source LLM observability built on OpenTelemetry, with automatic instrumentation for major providers and frameworks

Open Source Free Trial

Helicone

Open-source LLM observability platform for monitoring, debugging, and improving AI applications.

Open Source Free Trial

Agenta

Open-source prompt management, evaluation, and observability for LLM apps

Open Source Free Trial

LangWatch

LLM observability platform with quality monitoring, guardrails, and evaluation workflows

Open Source Free Trial

Log10

LLMOps logging and debugging platform; log10.io now redirects to a life-sciences agent product. See alternatives.

Free Trial

Weckr

Tracks LLM cost and margin per end customer, with spending caps that fire before the call

Open Source Free Trial

Laminar

Open-source agent observability with traces, failure detection and evals

Open Source Free Trial

Sentrial

Production monitoring for AI agents with automated failure detection and diagnosis

Free Trial

Telemetry

Structured event collection and SQL analytics for applications and coding agents

Free Trial

The Context Company

Agent observability that pairs traces with conversation analytics to catch silent failures in production

Free Trial

Dunetrace

Runtime reliability and failure detection for AI agents

Open Source Free Trial

Honeyhive

AI Performance and Reliability, Delivered

Free Trial

Klu

Collaborate on prompts, evaluate, and optimize LLM-powered Apps with Klu.

Free Trial

lunary

The platform to monitor, manage and improve your LLM apps.

Free Trial

Humanloop

Develop AI features with confidence

Free Trial

Datadog LLM Observability

LLM tracing, evaluation, and prompt monitoring built into the Datadog APM platform

Free Trial

Greptime

Gain comprehensive insights into the cost, performance, feedback, traces of your LLM applications.

Open Source Free Trial

DeepEval

Open-source LLM evaluation framework with 50+ metrics for testing agents, RAG, and chatbots

Open Source Free Trial

RAGAS

Open-source evaluation and testing framework for LLM and RAG applications

Open Source Free Trial

Portkey

AI gateway for routing to 1,600+ LLMs with observability, guardrails, and prompt management

Open Source Free Trial

Evidently AI

Open-source ML and LLM evaluation with 100+ built-in metrics and CI/CD integration

Open Source Free Trial

Future AGI

Open-source platform for testing, monitoring, and improving AI agents with tracing, evals, guardrails, and gateway

Open Source Free Trial

PromptLayer

Visually manage prompts. Evaluate models. Log LLM requests. Search usage history. Collaborate as a team.

Free Trial

Rhesis AI

Open-source testing platform for LLM and agentic applications. Test generation, adversarial probing, and regression t...

Open Source Free Trial

Galileo

AI evaluation and observability platform with hallucination detection and real-time guardrails

Free Trial

Giskard

Eliminate risks of biases, performance issues & security holes in AI models. In <10 lines of code.

Open Source Free Trial

Cekura

Testing and monitoring platform for AI voice and chat agents

Free Trial

AI Gateway HQ

LLM gateway built around spend limits enforced before a request reaches a provider

Free Trial

EidoStack

Browser workspace for comparing LLM responses side by side using your own API keys

Free Trial

HAIEC

Scans AI application code, runs adversarial tests against live endpoints, and generates signed compliance evidence

Free Trial

BenchGen

Simulated environments for benchmarking AI agents on multi-step tasks, with trajectory-level scoring

AISIX

Open-source AI gateway in Rust with one OpenAI-compatible API across 100+ LLM providers

Open Source Free Trial

2kw.ai

EU-hosted AI integration platform combining a provider gateway, document extraction, evals and cost observability

Free Trial

Hamming AI

At-scale testing & production monitoring for AI voice agents

Redcells

Automated adversarial testing for AI systems you own, with replayable evidence

Inquio

Audits real chatbot conversations to find wrong answers, missed intents and safety issues

Free Trial

TruLens

Systematically evaluate and track LLM apps and agents with feedback functions and tracing

Open Source Free Trial

Cleanlab

Real-time detection and remediation of incorrect, unsafe, or non-compliant AI agent responses

Free Trial

Vercel AI Gateway

Unified API for hundreds of AI models, with built-in rate limiting and key management

Free Trial

Braintrust

Stop building AI in the dark.

Free Trial

Cloudflare AI Gateway

LLM proxy with caching, logging, rate limiting, and cost analytics

Patronus AI

Detect LLM mistakes at scale and use generative AI with confidence

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