Top 9 LangDB Alternatives 2026

What is Pydantic AI Gateway?

Pydantic AI Gateway routes model calls through one endpoint with per-credential budgets, access rules and request records that feed Pydantic Logfire for tracing. Traffic on a team's own provider keys carries no fee on the personal tier; calls through Pydantic's built-in providers carry a ...

What is AISIX?

AISIX is an AI gateway built by API7, the company behind Apache APISIX, that fronts model providers with one API and applies routing, retries, rate limits and per-token cost accounting at the proxy. It records request and response bodies for later inspection, which is how its plans are metered, ...

What is agentgateway?

agentgateway is an Apache-licensed proxy from Solo.io that sits in front of model providers and Model Context Protocol servers, applying identity, authorization, rate limits and traffic policy to agent calls the way a service mesh does for ordinary services. It runs standalone or inside ...

What is Higress?

Higress is an open-source gateway built on Envoy and Istio that routes traffic to model providers with token-based rate limiting, fallback, caching and request logging, and runs as an ingress controller in Kubernetes. It is a CNCF Sandbox project and the community edition is free to self-host. ...

What is OpenRouter?

OpenRouter is a hosted routing layer that exposes hundreds of models from many vendors through a single OpenAI-compatible endpoint and one account balance, so a team can switch models without opening a new vendor contract. Requests fall over to another provider when one is rate limited or down, ...

What is Vercel AI Gateway?

Vercel AI Gateway routes requests from applications deployed on Vercel to many model providers through one endpoint and one bill, with failover when a provider is unavailable. The vendor states it applies no markup and no platform fee to model tokens; observability and policy add-ons such as ...

What is LiteLLM?

LiteLLM is an open-source Python SDK and proxy server that accepts requests in OpenAI's format and forwards them to more than 100 model providers, so application code keeps one request shape when the underlying model changes. The proxy adds virtual API keys per team, spend budgets, rate limits, ...

What is F5 AI Gateway?

F5 AI Gateway inspects and routes prompts and model responses in front of self-hosted and vendor-hosted models, applying rate limits, request and response filtering, and policy for sensitive data before traffic reaches a provider. It is sold into organisations already running F5 for application ...

What is Requesty?

Requesty is a hosted router that places many model providers behind one API key and bills a flat percentage on top of model cost, with no seat fee and no monthly minimum. It handles fallback when a provider errors, caches repeated requests, and reports spend by user, model and application. A ...