LangChain vs Langfuse

LangChain: Framework and platform for building LLM applications and agents. Langfuse: Open-source tracing and evals for LLM applications.

Pricing, free tier, and features on this page come from each tool's own site. Google autocomplete (suggestqueries.google.com, client=firefox, hl=en) for "<tool> vs", fetched 2026-10-14; a pair is kept when the suggestion appears from both sides (2+ hits). Sorted by how much you can use for free (free or open source first, then free plan with paid tiers, then paid only), then by the number of documented features, then alphabetically. No ratings or reviews are used. Read the comparison methodology. How benchmark evidence is labeled.

	LangChain	Langfuse
What it is	Framework and platform for building LLM applications and agents.	Open-source tracing and evals for LLM applications.
Category	Agents	Agents
Pricing	Freemium (free plan + paid tiers)	Freemium (free plan + paid tiers)
Free tier	Yes	Yes
Starting price	—	Paid plans from $29/month
Who it's for	For individual developers and teams of any size building agents.	Developers building production AI agents and LLM applications.
Key features	Trace agent runs step by step and search traces fast	Trace LLM calls, tool use, and retrieval steps
	Turn traces into datasets and score each agent step	Filter traces by user, session, cost, latency, or metadata
	Deploy agents with persistent state and isolated code sandboxes	Score outputs with model judges, rules, or human review
	Build agents in code or natural language with any model	Version prompts and deploy or roll them back
	Limit model spend and check calls for sensitive data	Track cost, latency, and quality with dashboards and alerts
Website	www.langchain.com	langfuse.com

Data comes from each tool's homepage and pricing page. Pair chosen from search suggestions (langchain vs langfuse; langfuse vs langchain).