Open Source Gravitee Alternatives

Apache APISIX is a high-performance, open-source API gateway designed for teams running microservices, APIs, and increasingly, AI workloads. Built on NGINX and etcd, it handles roughly 18,000 requests per second per core with around 0.2ms added latency. That's not a marketing claim – it's a product of its radixtree route matching and plugin architecture.

The gateway is fully dynamic. Configuration changes propagate across the cluster via etcd in real time, with no restarts required. Plugins hot-reload, routes update live, and health checks run continuously. For teams that need to iterate quickly without downtime, this matters.

Key capabilities include:

• 100+ plugins covering authentication (JWT, Key Auth, OIDC, Keycloak), rate limiting, CORS, circuit breaking, and observability integrations
• LLM traffic management – proxy and govern requests to 20+ providers including OpenAI, Anthropic, AWS Bedrock, DeepSeek, and Ollama, making it a capable AI gateway alongside tools like LiteLLM or Portkey
• Protocol flexibility – HTTP, gRPC, WebSockets, Dubbo, MQTT, and HTTP-to-gRPC transcoding
• Platform agnostic – runs on bare metal, VMs, Kubernetes, and ARM64 hardware
• Custom extensibility – write your own plugins, load balancing algorithms, and routing logic

Compared to alternatives like Tyk or KrakenD, APISIX leans heavily on its plugin ecosystem and the Apache Software Foundation's governance model. It's a top-level ASF project, Apache 2.0 licensed, with a broad community behind it.

The AI gateway layer isn't a separate product. It's the same routing and plugin infrastructure applied to LLM traffic, which means you get the same observability, security controls, and load balancing for your AI apps that you already run for your REST APIs.

Tyk is a comprehensive API management platform designed for modern enterprises managing REST, GraphQL, gRPC, and async APIs at scale. Built on open standards with no vendor lock-in, it provides the flexibility to deploy anywhere - cloud, on-premises, or hybrid environments.

The platform combines a high-performance open source API gateway with enterprise-grade analytics, developer portal, and management dashboard. With proven results like 45x faster deployments and handling 100M+ daily API calls, Tyk delivers exceptional performance and reliability.

Key capabilities include:

• AI-ready infrastructure with LLM governance and AI Studio for secure AI integration
• Universal API support for all modern API types without plugins
• Governance without bottlenecks using guardrails that accelerate development
• Enterprise security with OAuth, threat protection, and compliance automation
• Developer-first experience with intuitive setup and powerful customization

Trusted by 400+ global businesses including major financial services, travel, and telecom companies, Tyk reduces complexity while accelerating API development. The platform offers flexible deployment options from fully managed SaaS to self-hosted solutions, making it suitable for organizations of any size seeking to future-proof their API strategy.

Mockoon revolutionizes API development with its user-friendly, feature-rich mock server. This powerful tool enables developers to create and run mock REST APIs effortlessly, accelerating the development process and enhancing collaboration.

Key benefits of Mockoon include:

• No-code API mocking: Create complex mock APIs without writing a single line of code, saving time and reducing barriers to entry.
• Intuitive interface: Navigate through a sleek, easy-to-use interface that simplifies the mocking process for developers of all skill levels.
• Realistic API simulation: Generate dynamic responses, add latency, and simulate various scenarios to create a true-to-life API environment.
• Local and cloud deployment: Run mock APIs locally for rapid development or deploy to the cloud for team-wide accessibility.
• Import and export capabilities: Seamlessly import existing API specifications (OpenAPI, Swagger) and export your mock APIs for easy sharing and version control.
• Extensive customization: Fine-tune your mock APIs with custom headers, status codes, and response types to match real-world scenarios.
• Cross-platform compatibility: Use Mockoon on Windows, macOS, or Linux, ensuring flexibility across different development environments.

By leveraging Mockoon, development teams can significantly reduce dependencies on external services, accelerate testing processes, and improve overall productivity. Whether you're prototyping a new API, testing edge cases, or working offline, Mockoon provides the tools you need to streamline your workflow and deliver high-quality applications faster.

UnKey revolutionizes API key management, offering developers a robust and user-friendly solution for securing and scaling their applications. With UnKey, you can effortlessly create, revoke, and monitor API keys, ensuring optimal control over access to your services.

Key benefits of UnKey include:

• Simplified Key Management: Create and manage API keys with ease, streamlining your development workflow.
• Enhanced Security: Implement robust authentication measures to protect your APIs from unauthorized access.
• Real-time Monitoring: Gain valuable insights into API key usage, helping you identify potential issues and optimize performance.
• Scalability: Designed to grow with your application, UnKey handles millions of requests without breaking a sweat.
• Developer-Friendly: Intuitive APIs and comprehensive documentation make integration a breeze.
• Customizable Permissions: Fine-tune access control with granular permission settings for each API key.
• Automatic Key Rotation: Enhance security with scheduled key rotations, reducing the risk of compromised credentials.
• Usage Analytics: Make data-driven decisions with detailed analytics on API key usage patterns.

Whether you're a solo developer or part of a large team, UnKey provides the tools you need to manage API authentication efficiently and securely. Say goodbye to the headaches of traditional key management and hello to a more streamlined, powerful approach with UnKey.

KrakenD delivers unmatched performance for modern microservices architectures, processing over 80,000 requests per second on commodity hardware. This stateless, distributed API gateway goes beyond simple reverse-proxy functionality to provide comprehensive API management.

Key advantages include:

• Linear scalability with stateless architecture ensuring consistent performance at any scale
• Single binary deployment with GitOps-friendly configuration management
• Transparent pricing with unlimited requests and APIs across all plans
• Enterprise-grade reliability trusted by Fortune 500 companies worldwide

The platform excels at solving shared microservices concerns including API aggregation, traffic management, authentication (JWT, OAuth2, mTLS), and connectivity to diverse services like GraphQL, gRPC, Kafka, and Lambda. Built-in data transformation capabilities allow automatic protocol conversion between JSON, XML, and SOAP.

Comprehensive monitoring through OpenTelemetry integrations provides deep insights into performance and usage patterns. The OpenAPI exporter automatically generates documentation websites, while GitOps compatibility enables version-controlled configuration management.

Companies like Hepsiburada run over 800 KrakenD containers in production, highlighting its proven scalability. The combination of speed, simplicity, and comprehensive feature set makes KrakenD ideal for organizations transitioning to microservices or scaling existing API infrastructure.