Spanlens

Drop-in LLM observability logging OpenAI, Anthropic, and Gemini requests

PlatformWebfreemiumglobal

Spanlens is an MIT-licensed LLM observability platform that works as a drop-in replacement for provider SDKs to capture every request made to OpenAI, Anthropic, Gemini, and other providers. It records request bodies, headers, tokens, cost and latency, visualizes multi-step agent workflows as waterfall span trees with cost attribution, alerts on budget issues and anomalies, and can be self-hosted with exports to JSON/CSV/Parquet or S3/BigQuery for engineering teams shipping LLM-powered features.

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