Spanlens is described as 'Is open-source LLM observability built for application developers. Drop in a one-line proxy or SDK swap and every OpenAI, Anthropic, or Gemini call your app makes is captured with full request and response body, model, tokens, cost, and latency' and is an app in the ai tools & services category. There are five alternatives to Spanlens for Web-based, Self-Hosted, SaaS, Docker and Cloudron. The best Spanlens alternative is Langfuse, which is free. Other great apps like Spanlens are Helicone, Opik, LLMCap and Glassbrain.
Open source LLM engineering platform: LLM Observability, metrics, evals, prompt management, playground, datasets. Integrates with OpenTelemetry, Langchain, OpenAI SDK, LiteLLM, and more.
Helicone is the open-source LLM observability platform for developers to monitor, debug, and improve production-ready applications.
Opik is an open-source platform for evaluating, testing and monitoring LLM applications. Built by Comet.
LLMCap is a reverse proxy that enforces real-time, dollar-based spending caps on LLM API calls. When you hit your cap, the next request returns 429 — the token is never consumed and money is never spent.
Glassbrain captures every step of your AI app as an interactive visual trace tree. Click any node, swap the input, replay instantly without redeploying. Snapshot mode stores deterministic replays. Live mode hits your actual stack.
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