Best Helicone alternatives
8 tools developers use instead of Helicone, ranked by popularity. 8 offer a free plan and 4 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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Open-source LLM observability platform for tracing, evaluating, and debugging prompts and agent runs, self-hostable or available as a managed cloud service.
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Open-source Python library and proxy server that calls 100+ LLM providers through one OpenAI-compatible interface, with built-in cost tracking and load balancing.
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Weights & Biases toolkit for tracing, evaluating and monitoring LLM applications, with automatic call logging and scorers.