Apache APISIX vs Fusio

Apache APISIX is a free, Apache 2.0-licensed, self-hosted gateway for routing, securing and managing API, microservice and LLM traffic. It runs on bare metal or Kubernetes and supports HTTP, HTTPS, TCP, UDP, WebSocket, gRPC, MQTT, HTTP/3 and Dubbo, with HTTP-to-gRPC transcoding. More than 100 open-source plugins cover traffic management, security, observability and protocol handling. The project provides authentication options including API keys, JWT, Basic Authentication, OAuth 2.0/OpenID Connect, HMAC, LDAP, CAS, Keycloak, Casdoor, forward authentication and multi-auth, along with rate limiting and request transformation. Its NGINX-and-etcd architecture uses hot-reloadable plugins and distributes cluster configuration without restarts. AI gateway functions include multi-provider proxying, load balancing, retries, fallback, token limits, prompt security and transformation. Listed integrations include Prometheus, Grafana, Datadog, OpenTelemetry, Kubernetes, Redis, OpenAI, Anthropic and AWS Bedrock. Official source releases include detached signatures and SHA-512 checksums.

Fusio is an open-source API management platform for connecting business logic and infrastructure to APIs. It is self-hosted and brings databases, microservices, and custom scripts behind a unified gateway that handles routing, authentication, and request validation. TypeSchema models add validation and generate OpenAPI specifications and client SDKs in multiple languages. A developer portal provides documentation, testing tools, and API keys; API monetization features can manage plans, quotas, subscriptions, and billing. AI-assisted development and AI/MCP integration are described as optional. Official adapters cover services and technologies such as AWS, Google Cloud, GraphQL, LDAP, MongoDB, Redis, SQL, Stripe, and SOAP. Worker runtimes are available for PHP, JavaScript, and Python, with SDKs listed for C#, Go, Java, JavaScript, PHP, and Python. Fusio also documents lifecycle management, access policies, and API analytics. Install options include a release archive, Composer, or Docker. The code is licensed under Apache 2.0. Fusio is available for free.