RelayPlane, LiteLLM, OpenRouter: Key Differences in AI Gateway Tools Explained

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A developer who built RelayPlane has published a comparison of three AI proxy and routing tools: RelayPlane, LiteLLM, and OpenRouter. RelayPlane is a lightweight, locally installed npm package designed for single-machine use, offering a hard daily spend cap, per-request cost logging via SQLite, and a kill switch with no database server required. LiteLLM is a self-hosted, open-source gateway suited for teams, supporting over 100 providers, virtual keys, and per-tenant budget controls. OpenRouter is a fully hosted service requiring no infrastructure, providing access to over 500 models through a single API key, though cost enforcement happens on their cloud rather than locally. The author acknowledges personal bias toward RelayPlane and directs readers to official documentation for each tool to verify the claims independently.

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