An API gateway sits between your clients and your backend services — handling authentication, rate limiting, request routing, and observability in one place. In a microservices architecture, the API gateway is the single entry point that keeps complexity away from clients. This comparison covers the leading API gateway solutions, from lightweight open source to fully managed cloud services.
Quick Comparison
| Feature | Kong | Apache APISIX | Tyk | AWS API Gateway |
|---|
| Type | Open source + Enterprise | Open source (Apache 2.0) | Open source + Managed | Fully managed (AWS) |
| Language | Lua (OpenResty) | Lua (OpenResty) / Wasm | Go | Managed service |
| Plugin Ecosystem | 200+ plugins (largest ecosystem) | 80+ plugins (growing fast) | 40+ plugins | Native AWS integrations |
| Custom Plugins | Lua, Go, JavaScript, Python, Wasm | Lua, Go, Wasm, Java, Python | Go, JavaScript, Python (gRPC) | Lambda authorizers |
| Performance (req/s) | ~50K/s (single node) | ~80K/s (single node, newer arch) | ~40K/s (single node) | Auto-scaled (AWS managed) |
| Configuration | Declarative (YAML/JSON) + Admin API | Declarative + Admin API + Dashboard | REST API + Dashboard | AWS Console, CloudFormation, CDK |
| Kubernetes Native | Yes (Kong Ingress Controller) | Yes (APISIX Ingress Controller) | Yes (Tyk Operator) | N/A (AWS managed) |
| Pricing | Free (OSS), Enterprise from $500/mo | Free (Apache 2.0) | Free (OSS), Pro from $500/mo | $3.50/1M requests (REST) |
| Best For | Large enterprises, broad plugin needs | Cloud-native, performance-focused | Teams wanting Go-native, good dashboard | AWS-native applications |
Key API Gateway Features Checklist
| Feature | Why It Matters |
|---|
| Authentication (JWT, OAuth, API Key) | Verify every request at the gateway — backends never see unauthenticated traffic |
| Rate Limiting | Protect backends from abuse; enforce per-user or per-plan limits |
| Request/Response Transformation | Modify headers, rewrite paths, transform payloads without code changes |
| Load Balancing | Distribute traffic across backend instances with health checks |
| Caching | Cache responses at the gateway to reduce backend load |
| Observability (Logs, Metrics, Tracing) | Prometheus metrics, request logging, distributed tracing (OpenTelemetry) |
| Circuit Breaking | Stop routing to failing backends; return fallback response |
| Service Discovery | Auto-detect backend services (Kubernetes, Consul, DNS) |
| mTLS | Mutual TLS between gateway and backends for zero-trust networking |
Decision Matrix
| Scenario | Best Gateway | Why |
|---|
| Enterprise, need maximum plugin ecosystem | Kong | 200+ plugins, most mature, best documentation |
| Cloud-native, Kubernetes-first | Apache APISIX | Best performance, Wasm plugins, Apache 2.0 license |
| Go ecosystem, want excellent dashboard | Tyk | Go-native, best admin dashboard of the open source options |
| AWS ecosystem, zero ops | AWS API Gateway | Fully managed, tight AWS service integration |
| Simple reverse proxy needs | None (use Caddy/Nginx/Traefik) | API Gateway is overkill for simple routing |
Bottom line: Apache APISIX is the rising star — best performance, Apache 2.0 license (no open core tricks), and growing plugin ecosystem. Kong is the safe enterprise choice with the largest plugin library. AWS API Gateway is the obvious pick if you are all-in on AWS. For most projects, start without an API gateway (Nginx/Caddy/Traefik handle simple routing), then add one when you need per-route auth, rate limiting, or request transformation. See also: Nginx vs Caddy vs Traefik and API Design Patterns.