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About LangSmith
LangSmith records traces of what an agent does step by step, so you can find failures and see where latency and cost come from. It supports popular agent frameworks natively and offers OpenTelemetry-based SDKs for Python, TypeScript, Go and Java.
Monitoring adds real-time dashboards, cost tracking, online LLM-as-judge and code evals, tool and trajectory monitoring, and alerts through webhooks or PagerDuty. It is mainly used as a hosted service, and documentation also covers self-hosting on Kubernetes.
Strengths
- Detailed step-by-step agent tracing
- SDKs for Python, TypeScript, Go and Java
- Online evals and cost tracking in production
- Webhook and PagerDuty alerts
Limitations
- Proprietary hosted service
- Self-hosting requires Kubernetes
Details
- Pricing
- FreemiumCan be tried for free, with paid plans listed on its pricing page.
- License
- Proprietary
- Developer
- LangChain
- Platforms
- Web
- How it runs
- Self-hosted, Hosted service
- Account
- Required
- Works offline
- No
- Best suited for
- Teams running LLM agents in production who need tracing and monitoring
- Categories
- AI developer tools
- Last verified
- Added
- Sources
Alternatives to LangSmith
Compare allSoftware that can replace LangSmith for an important use case, and what changes if you switch.
Langfuse
An open-source platform for tracing, evaluating and managing prompts for LLM applications and AI agents.
Langfuse is open source with tracing, prompt management and evals, and can be self-hosted without Kubernetes or used as a hosted service.
Arize Phoenix
A self-hostable tool for tracing, evaluating and experimenting with LLM applications and agents.
Arize Phoenix runs tracing, evals and experiments locally, in Docker or on Kubernetes, with a hosted option, under a source-available license.
Opik
An open-source platform from Comet for debugging, evaluating and monitoring LLM applications and agents.
Opik is an open-source, self-hostable platform from Comet with tracing, automated evaluations and dashboards for RAG and agent workflows.
MLflow
An open-source platform for tracing, evaluating and managing LLM applications, agents and machine learning models.
MLflow is Apache-2.0 with provider-independent OpenTelemetry tracing and 50+ evaluation metrics, but you host and maintain the server yourself.
Helicone
An open-source AI gateway and observability platform for routing, logging and debugging LLM requests.
Helicone is an Apache-2.0 gateway that logs LLM requests and tracks costs across providers, with a self-host option, but its roadmap is uncertain after joining Mintlify.
Weights & Biases
A hosted platform for tracking machine learning experiments, evaluating models and tracing LLM applications.
Weights & Biases is also a proprietary hosted platform, adding experiment tracking for classic ML training alongside LLM tracing.
LangSmith as an alternative
Listings that name LangSmith as an alternative.
Promptfoo
A command-line tool for testing prompts, evaluating model output and red-teaming LLM applications and agents.
LangSmith is a proprietary hosted service focused on production agent tracing with online evals and alerts, replacing Promptfoo's local command-line testing, and self-hosting it requires Kubernetes.
Similar software
Related functionality, not necessarily a direct replacement.
DeepEval
An open-source Python framework for unit-testing and evaluating the outputs of large language model applications.
Langflow
Visual builder for creating and deploying AI agent workflows.
Evidently
An open-source framework for evaluating, testing and monitoring LLM applications, RAG systems and ML models.
