LangSmith Alternative · Self-hosted · MIT Licensed

AgentLens vs LangSmith
Same visibility. Your infrastructure.

Q: Is AgentLens a drop-in LangSmith replacement?

AgentLens provides the same core capabilities — tracing, evals, cost tracking, agent debugging — with a 2-line SDK install. It is not API-compatible with LangSmith, but the mental model and dashboard are familiar. Most teams migrate in under an hour.

Q: Does AgentLens work without LangChain?

Yes. AgentLens is framework-agnostic. It works with plain OpenAI/Anthropic SDKs, LangChain, LlamaIndex, CrewAI, AutoGen, and custom agent code.

LangSmith is powerful — but self-hosting is locked behind Enterprise, and every prompt your users send flows through LangChain's US cloud. AgentLens gives you the same tracing, evals, and agent debugging, self-hosted by default.

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Quick Comparison

Feature-by-feature

Capability	AgentLens	LangSmith
Self-hosted (free tier)	✓ default, MIT	Enterprise plan only
EU data residency / GDPR DPA	✓ Team+ plan	Enterprise plan only
Automatic quality scoring	✓ zero config	Manual eval setup
Hallucination detection	✓ built-in	✗
Agent waterfall debugger	✓	✓
Framework-agnostic SDK	✓ any Python	LangChain-native
Cost tracking + budget alerts	✓	✓
2-line integration	✓	✓
Starting price (managed)	€299 / mo flat	$39 / seat / mo + usage
Starting price (self-hosted)	Free (MIT)	Enterprise contract

Based on public LangSmith pricing as of April 2026. Verify at langchain.com/pricing.

When to choose what

Honest recommendation

Choose LangSmith if…

Your team is deeply invested in the LangChain ecosystem
You're fine with data flowing through US cloud
You have budget for Enterprise self-hosting (~$5k+/mo)
You need tight coupling with LangChain Hub + LangGraph tooling

Choose AgentLens if…

Your prompts contain user data that can't leave EU / your VPC
You want self-hosting without a 5-figure contract
You want quality scoring + hallucination detection out of the box
You use multiple frameworks (LangChain + raw OpenAI + custom)
You want flat pricing — no per-seat billing

Migration

Switching from LangSmith takes ~30 minutes

Both tools use a decorator/patch model. The SDK surface is different, but the migration is mechanical.

# Before (LangSmith)
import os
os.environ["LANGCHAIN_TRACING_V2"] = "true"
os.environ["LANGCHAIN_API_KEY"] = "..."
 
# After (AgentLens)
import agentlens
agentlens.init("https://agentlens.your-company.com")
agentlens.patch_openai()  # or patch_anthropic()

FAQ

Common questions

Is AgentLens a drop-in LangSmith replacement?

Not API-compatible — but the mental model (traces, spans, evals) is identical and the dashboard is familiar. Most teams migrate in under an hour.

Can I self-host LangSmith?

LangSmith self-hosting is restricted to LangChain's Enterprise plan. AgentLens is self-hosted by default and MIT licensed — you can run it on a €5 VPS.

Does AgentLens work without LangChain?

Yes. Framework-agnostic. Works with plain OpenAI/Anthropic SDKs, LangChain, LlamaIndex, CrewAI, AutoGen, and custom agents.

How much does AgentLens cost compared to LangSmith?

LangSmith Plus starts at $39/seat/month plus usage. AgentLens Starter is €299/month flat for 1M calls (no seat limits), or free when self-hosted.

Is there a GDPR DPA available?

Yes, included on Team plan (€999/mo) and above. LangSmith's DPA is Enterprise-tier only.

AgentLens vs LangSmithSame visibility. Your infrastructure.