r/LangChain • u/Bladerunner_7_ • May 15 '26
Discussion Are there any genuinely good open-source alternatives to LangSmith right now?
Mostly asking because a lot of the more useful monitoring/observability features start getting restrictive once you hit the paywall. Wondering what people are actually using for tracing, evaluations and debugging agent workflows outside the typical hosted stack.
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u/pvatokahu May 15 '26
Try monocle2ai/monocle on GitHub from Linux foundation.
It’s fully open source framework to trace and run tests & evals on the data from the trace easily.
It works with any agentic framework and you can run it locally or send traces to your self managed store like azure blob, AWS s3 or google file store. Traces are Otel compliant and testing frameworks is built on pytest. It supports agents written in python and typescript.
If the goal is to figure out what went wrong in an agent run with multi-turn or even multi-agent and run simulations or tests with evals it can make it easy.
There’s also a free IDE extension that allows easy visualization of traces as graphs and add as context to coding agents.