Alternatives to Langfuse

LangSmith agent observability: trace, monitor, and evaluate every LLM run with SmithDB-backed trace search.

Helicone is an AI gateway and LLM observability platform that routes, logs, and caches traffic across 100+ model providers.

Open source LLM observability with OpenTelemetry tracing, evals, and prompt management for agents

Open-source LLM observability and agent evaluation you can trace, self-host, and eval end to end.

Open-source AI evaluation and observability for LLMs, RAG apps, AI agents, and ML models.

Observability and optimization for OpenClaw agents — trace failures, attribute cost, and ask Tracy what to fix.

Maxim AI pairs AI agent evaluation, simulation and observability with Bifrost, an open-source LLM gateway.

Braintrust delivers agent observability with evals, pattern discovery, and trace-scale storage in one platform.

OpenTelemetry-native tracing and benchmarked LLM-judge evals for AI agents and RAG apps.

Open-source Python library that turns vibe checks into reproducible evaluation loops for RAG pipelines and AI agents.

OpenJudge is an Apache 2.0 open-source AI evaluation framework shipping 50+ benchmark-validated graders for agents, LLMs, code, math, and multimodal models.

PandaProbe is open-source agent observability that traces runs, evaluates outcomes, and converts failures into validated repair rules

Claw Lens is a zero-config local observability dashboard for OpenClaw AI agents — live monitor, cost analytics, and security audit in one

Comet's Opik turns LLM observability and evaluation into agent code fixes, not just trace dashboards

LLM evaluation and observability that turns production traces into repeatable evals and CI regression tests

Edgee Team gives engineering leaders per-repo, per-PR token observability and spending caps for coding agents.

Agnost AI monitors production AI agents, clusters silent failures, and opens a fix for review.

Open-source LLMOps platform for tracing, agent simulations, evaluations and an AI gateway, from your own agents to the coding agents your engineers run.

Fiddler AI is an AI agent observability and control plane with inline guardrails, continuous evaluation, and auditable governance.

Galileo turns pre-launch AI evals into production guardrails that block bad agent and RAG responses at runtime.

Trace, replay and debug AI agent runs — LLM calls, tool use and multi-agent interactions in one timeline via a single SDK

Athina is a shared workspace where your team writes prompts, runs evals, annotates datasets, and traces LLM calls in production.

Agent observability with Signals: Laminar surfaces agent failures you never had to define.

Chronicle Labs replays your production data to test and validate AI agents before launch.

Raindrop traces AI agent runs, detects silent behavioral failures in production, and simulates fixes in CI before merge.

OpenTelemetry-native LLM tracing, evals, prompt management and GPU monitoring you can self-host free under Apache 2.0.

Local token usage and cost tracking for 21 AI coding agents — reads the logs they already write.

Open-source benchmark that scores AI agents on real, multi-step software-company work tasks.

Agent monitoring and evals that surface recurring failures, search any pattern, and test fixes offline before you ship.

Sharbo is a skill network for AI agents — encode expert workflows once, let every agent activate them autonomously.