Fusio vs KrakenD API Gateway

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.

KrakenD API Gateway is a stateless, distributed gateway for connecting, securing, aggregating, and transforming APIs and AI workloads. It can combine data from multiple services into one response shaped for client needs. Traffic controls include rate limiting, circuit breaking, IP filtering, bot detection, and load balancing. Connectivity includes REST, RabbitMQ, SNS, SQS, Kafka, GraphQL, gRPC, SOAP, and Lambda; listed protocols also include HTTP, WebSockets, AMQP, and NATS. Authentication options include JWT, OAuth2, OpenID Connect, client credentials, API keys, Basic Authentication, and mTLS. KrakenD is self-hosted, with deployment choices including Docker, Kubernetes, cloud marketplace virtual machines, and Linux packages or binaries. The maker says the development Docker image can be used on Windows, Mac, or Linux, and KrakenD runs natively on Linux and Mac OS. Community Edition costs nothing and includes unlimited requests, APIs, and AI workloads. AI Gateway and AI security are Enterprise features.