Best Langfuse alternatives
5 tools developers use instead of Langfuse, ranked by popularity. 5 offer a free plan and 3 are open source. Updated October 2026.
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Open-source LLM observability and evaluation platform built on OpenTelemetry, with tracing, datasets, experiments and prompt tooling.
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Weights & Biases toolkit for tracing, evaluating and monitoring LLM applications, with automatic call logging and scorers.
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Open-source LLM observability proxy that sits between your app and a model provider, logging requests, costs, and latency with a one-line integration change.