20 Best Open Source API Gateway Software in 2026

Open source API gateway software lets you manage, secure, and monitor APIs using technology you can inspect and adapt yourself. If you’re searching for the best way to route, protect, and scale your APIs without vendor lock-in, this list gives you real options that meet modern infrastructure demands. I break down which solutions work best for automation, dynamic routing, or integration, so you can pick a gateway that fits your stack now and grows with you later. Expect clear details to help your team choose the right tool and avoid wasting time on the wrong fit.

Best Open Source API Gateway Software Summary

This comparison chart summarizes pricing details for my top open source API gateway software selections to help you find the best one for your budget and business needs.

	Tool	Best For	Trial Info	Price
1	NGINX	Best for proven traffic management	Free plan + 30-day free trial + free demo available	Pricing upon request	Website
2	Kong	Best for automated GitOps API lifecycles	Free plan + free demo available	From $12/user/month (billed annually)	Website
3	Traefik	Best for Kubernetes-native deployments	Free plan + free demo available	Pricing upon request	Website
4	Apache APISIX	Best for real-time dynamic routing	Free forever plan	Free forever plan	Website
5	KrakenD	Best for ultra-high performance aggregation	Free plan + free demo available	Pricing upon request	Website
6	Gloo Gateway (Solo.io)	Best for hybrid and cloud-native integration	Free plan + free demo available	Pricing upon request	Website
7	WSO2	Best for full lifecycle API controls	30-day free trial available	From $119/month	Website
8	Spring Cloud Gateway	Best for Spring ecosystem compatibility	Free forever plan	Free forever plan	Website
9	API7.ai	Best for plugin-driven customizability	Free plan + 30-day free trial + free demo available	From $2/million of API calls/month	Website
10	Envoy Proxy	Best for service mesh environments	Free forever plan	Free forever plan	Website

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Best Open Source API Gateway Software Reviews

Below are my detailed summaries of the best open-source API gateway software that made my shortlist. My reviews offer a detailed look at the features, capabilities, and best use cases of each platform to help you find the best one for you.

1

NGINX

Best for proven traffic management

• Free plan + 30-day free trial + free demo available
• Pricing upon request

Visit Website

NGINX is an open source API gateway solution known for advanced HTTP traffic management, load balancing, reverse proxying, and configurable security controls.

Who Is NGINX Best For?

NGINX fits infrastructure teams and network engineers at organizations that manage high-traffic APIs and require granular traffic routing and security.

Why I Picked NGINX

I picked NGINX as one of the best because I trust its reputation for handling massive API and web traffic reliably. I use its traffic shaping, reverse proxy, and SSL termination features to efficiently control and route API requests at scale.

NGINX Key Features

• Declarative API configuration: Define API endpoints and gateway behaviour through YAML or JSON configs.
• Dynamic load balancing: Distribute traffic automatically across multiple backend services.
• Built-in caching: Cache API responses to reduce backend load and improve response times.
• Request and response transformation: Modify HTTP headers and payloads directly within the gateway layer.

NGINX Integrations

Integrations include Kubernetes, Helm, OpenTelemetry, Lua, and njs.

Pros and Cons

Pros:

• Supports advanced API request routing logic
• Widely adopted for high-traffic environments
• Configuration supports granular HTTP traffic rules

Cons:

• Advanced configuration often requires manual scripting
• Lacks built-in API analytics dashboard

LEARN MORE ABOUT NGINX:

• Check out NGINX on their website

2

Kong

Best for automated GitOps API lifecycles

• Free plan + free demo available
• From $12/user/month (billed annually)

Visit Website

Kong is an open source API gateway platform designed for managing, monitoring, and securing APIs and microservices across distributed architectures.

Who Is Kong Best For?

DevOps teams at enterprise organizations are managing complex, distributed API environments across multiple infrastructures.

Why I Picked Kong

I picked Kong as one of the best because I can automate API deployments using GitOps, manage configuration as code, and trigger version-controlled rollbacks straight from my CI/CD pipeline. This fits enterprises that need reliable automation for frequent updates.

Kong Key Features

• Plugin architecture: Extend functionality by adding plugins for security, traffic control, authentication, and transformation.
• API analytics dashboard: Monitor real-time traffic and request metrics from a centralized, visual dashboard.
• Load balancing: Distribute incoming API requests across multiple upstream services for consistent performance.
• Service mesh compatibility: Integrate with service meshes like Kuma and Istio to manage service-to-service communication.

Kong Integrations

Integrations include Kubernetes, VMs, ELK, OIDC, OAuth, AWS, GCP, Hashicorp, Azure, and gRPC.

Pros and Cons

Pros:

• Scalable with support for large API volumes
• Manages API configuration as code
• Automated API lifecycle management with GitOps

Cons:

• Requires external analytics tools
• Complex configuration for advanced traffic management

LEARN MORE ABOUT KONG:

• Check out Kong on their website

3

Traefik

Best for Kubernetes-native deployments

• Free plan + free demo available
• Pricing upon request

Visit Website

Traefik is an open source API gateway and reverse proxy that provides dynamic routing, load balancing, SSL termination, and service discovery, purpose-built to integrate with modern containerized and microservices environments.

Who Is Traefik Best For?

DevOps teams and platform engineers running Kubernetes clusters or managing scalable microservices in containerized environments.

Why I Picked Traefik

I picked Traefik as one of the best because I like how smoothly it connects with Kubernetes, dynamically updating routes as services scale. I use its integrated certificate management and native service discovery to simplify complex, distributed environments.

Traefik Key Features

• Middleware support: Insert authentication, rate limiting, and logging at the routing layer.
• Let's Encrypt integration: Automatically provision and renew SSL certificates.
• Dashboard UI: Visualize and manage routes, services, and middlewares in real time.
• ACME protocol support: Handle automated certificate management for HTTPS endpoints.

Traefik Integrations

Integrations include Kubernetes, Docker, Consul, Etcd, OIDC Authentication, GeoBlock, Fail2Ban, Modsecurity Plugin, Coraza WAF, and Tailscale Connectivity Authentication.

Pros and Cons

Pros:

• Native Let's Encrypt automatic SSL certificate handling
• Built-in support for HTTP/2 and gRPC Native
• Automatic certificate management for HTTPS

Cons:

• Lacks native distributed certificate storage
• Circuit breaking requires third-party middleware

LEARN MORE ABOUT TRAEFIK:

• Check out Traefik on their website

4

Apache APISIX

Best for real-time dynamic routing

• Free forever plan
• Free forever plan

Visit Website

Apache APISIX is an open source API gateway software that provides dynamic routing, traffic management, plugin extensibility, and real-time monitoring for API services across cloud-native and on-premises environments.

Who Is Apache APISIX Best For?

API engineers and platform teams at organizations deploying microservices or hybrid-cloud architectures need flexible, real-time routing.

Why I Picked Apache APISIX

I picked Apache APISIX because I can update routing and upstream rules instantly, without redeploying services. Its dynamic upstream management and hot-reload plugin system let my team adapt routing logic and enforce new policies in real time.

Apache APISIX Key Features

• Plugin extensibility: Add or customize behaviour with Lua-based plugins for authentication, security, and observability.
• Declarative configuration: Manage all gateway settings and resources with a YAML-based configuration system.
• gRPC support: Proxy and manage gRPC and gRPC-web traffic natively.
• Multi-protocol support: Handle HTTP, HTTPS, HTTP/2, WebSocket, and TCP/UDP connections within a single gateway.

Apache APISIX Integrations

Integrations include Batch-Requests, Lago, Keycloak, Casdoor, Casbin, Datadog, Kafka, Azure-Functions, AWS-Lambda, and Dubbo.

Pros and Cons

Pros:

• Strong support for multi-protocol traffic
• Plugin system with Lua for customization
• Real-time hot updating of routing rules

Cons:

• Documentation is fragmented across components
• Configuration can be complex for beginners

LEARN MORE ABOUT APACHE APISIX:

• Check out Apache APISIX on their website

5

KrakenD

Best for ultra-high performance aggregation

• Free plan + free demo available
• Pricing upon request

Visit Website

KrakenD is an open source API gateway platform for building, securing, and aggregating APIs, offering features like endpoint composition, request transformation, and advanced performance-focused customizations.

Who Is KrakenD Best For?

API architects and engineering teams at large enterprises or digital platforms that require rapid aggregation and transformation of data from multiple backend services.

Why I Picked KrakenD

I picked KrakenD as one of the best because I can aggregate responses from multiple APIs into a single endpoint with minimal latency. Its stateless, high-performance engine handles thousands of simultaneous connections and advanced transformation rules without extra middleware.

KrakenD Key Features

• Declarative configuration: Define API gateway behaviour via a single, human-readable JSON file.
• Built-in JWT validation: Authenticate and authorize traffic without external services.
• Rate limiting: Control request rates per endpoint or client.
• Plugin system: Extend functionality using Go-based custom plugins.

KrakenD Integrations

Integrations include Zipkin, X-Ray, Stackdriver, OpenCensus, Jaeger, WebSockets, SOAP, GeoIP, Postman, and OpenAI.

Pros and Cons

Pros:

• Declarative configuration using a JSON file
• Lua scripting for advanced customizations
• High throughput with very low latency

Cons:

• Native gRPC proxying is not supported
• Requires a full restart to update routes

LEARN MORE ABOUT KRAKEND:

• Check out KrakenD on their website

6

Gloo Gateway (Solo.io)

Best for hybrid and cloud-native integration

• Free plan + free demo available
• Pricing upon request

Visit Website

Gloo Gateway is an open source API gateway that combines traffic management, routing, security, observability, and API policy enforcement for both legacy and modern cloud-native environments.

Who Is Gloo Gateway Best For?

Platform architects and large enterprises managing both on-prem and cloud-native API infrastructure across hybrid environments.

Why I Picked Gloo Gateway

I picked Gloo Gateway as one of the best because I value its Envoy-based architecture and strong hybrid- and cloud-native support. I use its API federation and policy enforcement features to manage APIs across both legacy and modern clouds.

Gloo Gateway Key Features

• GraphQL support: Process and manage GraphQL APIs alongside REST and gRPC APIs.
• Automatic service discovery: Detects new and existing services in multi-cloud and on-prem environments.
• Built-in rate limiting: Apply API usage controls with detailed traffic policies.
• Developer portal: Provides a self-service interface for API consumers with documentation and key management.

Gloo Gateway Integrations

Integrations include Istio, AWS NLB, AWS ALB, AWS Lambda, Keycloak, and gRPC.

Pros and Cons

Pros:

• Kubernetes-native architecture for deployments
• Native GraphQL and gRPC API support
• Advanced Envoy-based traffic management capabilities

Cons:

• Full feature set relies on paid plan
• Configuration complexity for multi-cluster environments

LEARN MORE ABOUT GLOO GATEWAY (SOLO.IO):

• Check out Gloo Gateway (Solo.io) on their website

7

WSO2

Best for full lifecycle API controls

• 30-day free trial available
• From $119/month

Visit Website

WSO2 is an open source API gateway software that provides API creation, management, monitoring, access control, transformation, and policy enforcement for modern, distributed architectures.

Who Is WSO2 Best For?

WSO2 is a strong choice for platform architects and API program leads at midsize to large enterprises managing extensive API ecosystems.

Why I Picked WSO2

I picked WSO2 because I see how deeply it supports the entire API lifecycle, from design and publishing to analytics and policy enforcement. I often use its traffic management policies and seamless version control to coordinate secure, consistent updates across distributed environments.

WSO2 Key Features

• Role-based access controls: Define fine-grained permissions for API access and management.
• API monetization support: Enable and manage usage plans, tiered access, and billing models.
• Real-time API analytics: View and analyze live API traffic and usage patterns.
• Built-in threat protection: Protect APIs with pre-configured security and attack mitigation policies.

WSO2 Integrations

Integrations include Moesif, ELK, Jaeger, Zipkin, Grafana, Prometheus, SAP, Salesforce, Snowflake, and HubSpot.

Pros and Cons

Pros:

• Flexible deployment options for cloud and on-premises
• Strong API publishing and versioning tools
• Advanced policy enforcement for API security

Cons:

• UI setup is complex for new deployments
• Requires heavy custom coding for extensions

LEARN MORE ABOUT WSO2:

• Check out WSO2 on their website

8

Spring Cloud Gateway

Best for Spring ecosystem compatibility

• Free forever plan
• Free forever plan

Visit Website

Spring Cloud Gateway is an open source API gateway framework designed for microservices architecture, offering dynamic routing, request transformation, resilience, and integration with Spring-based environments.

Who Is Spring Cloud Gateway Best For?

Java development teams building microservices or distributed applications within existing Spring ecosystem environments.

Why I Picked Spring Cloud Gateway

I picked Spring Cloud Gateway as one of the best because it lets my team leverage prebuilt filters, request routing, and resilience patterns in tight alignment with Spring Boot. I rely on this gateway whenever I need to layer centralized API management directly into Spring-based services.

Spring Cloud Gateway Key Features

• Route predicates: Configure fine-grained request matching using built-in and custom predicates.
• Path rewriting: Rewrite incoming request paths before forwarding to backend services.
• Built-in rate limiting: Control API consumption with a token bucket rate limiter.
• Custom filters: Add or modify gateway behaviour with custom Java filter logic.

Spring Cloud Gateway Integrations

Spring Cloud Gateway offers native integrations within the Spring ecosystem, including Spring Boot, Spring Security, and Spring Cloud Config.

Pros and Cons

Pros:

• Reactive programming model for non-blocking APIs
• Supports dynamic routing and custom request filters
• Deep integration with Spring Boot and Spring Cloud

Cons:

• Deployment requires JVM runtime
• Limited non-Java language support

LEARN MORE ABOUT SPRING CLOUD GATEWAY:

• Check out Spring Cloud Gateway on their website

9

API7.ai

Best for plugin-driven customizability

• Free plan + 30-day free trial + free demo available
• From $2/million of API calls/month

Visit Website

API7.ai is an open source API gateway platform that provides centralized API management, traffic control, security features, and analytics with a modular architecture built for integration and customization.

Who Is API7.ai Best For?

API7.ai fits DevOps teams and system integrators at midsize or larger companies who need deep customization and extensibility for their API management infrastructure.

Why I Picked API7.ai

I picked API7.ai as one of my top choices because I like how its plugin architecture lets me implement custom authentication, logging, and transformation rules without forking the codebase. I use its Lua plugin system for fine-grained traffic management and policy control.

API7.ai Key Features

• Traffic rate limiting: Control API usage with flexible rate limits per user or endpoint.
• Dynamic upstream health checks: Monitor backend service health for routing adjustments in real time.
• SSL/TLS termination: Offload SSL decryption and encryption at the gateway for secure communications.
• Declarative configuration management: Manage routing and policies using YAML-based declarative configs.

API7.ai Integrations

Integrations include OpenAI, DeepSeek, Claude, Gemini, Mistral AI, Prometheus, Grafana, ClickHouse, Amazon Bedrock, and Azure OpenAI.

Pros and Cons

Pros:

• Observability with built-in metrics and tracing
• Supports hot-reloading configuration changes
• Plugin system supports advanced custom policies

Cons:

• Limited built-in authentication plugin options
• Complex configuration for multi-cluster setups

LEARN MORE ABOUT API7.AI:

• Check out API7.ai on their website

10

Envoy Proxy

Best for service mesh environments

• Free forever plan
• Free forever plan

Visit Website

Envoy Proxy is an open source edge and service proxy for API gateway use cases, offering dynamic routing, load balancing, observability, and support for advanced networking architectures.

Who Is Envoy Proxy Best For?

Infrastructure and DevOps teams in organizations building microservices or managing distributed applications at scale.

Why I Picked Envoy Proxy

I picked Envoy Proxy as one of my best options because its native service discovery, rich observability, and support for advanced load balancing are staples in our service mesh deployments. I use it when I want advanced traffic management across distributed environments.

Envoy Proxy Key Features

• Extensible filter chain: Insert filters at different networking layers for custom traffic processing.
• HTTP/2 and gRPC support: Handle modern communication protocols for real-time data and service interactions.
• Hot restart capabilities: Reload configurations with zero downtime or dropped connections.
• TLS termination: Manage secure connections by offloading the SSL/TLS handshake from backend services.

Envoy Proxy Integrations

Integrations include Ambassador, Cilium, Cloud Foundry, Consul, Contour, Enroute, Istio, Kuma, AWS App Mesh, and Instana.

Pros and Cons

Pros:

• Strong compatibility with service mesh platforms
• Advanced observability with built-in metrics
• Hot restart avoids connection drops

Cons:

• Limited built-in authentication features
• Configuration syntax can be complex

LEARN MORE ABOUT ENVOY PROXY:

• Check out Envoy Proxy on their website

Other Open Source API Gateway Software

Here are some additional open source API gateway software options that didn’t make it onto my shortlist, but are still worth checking out:

1. Tyk

   For flexible policy management

2. Gravitee

   For asynchronous event handling

3. Moesif

   For deep API traffic observability

4. Express Gateway

   For Node.js developer workflows

5. Emissary-Ingress

   For declarative CRD configuration

6. Higress

   For customizable AI traffic policies

7. Ocelot

   For .NET-centric API management

8. Fusio

   For low-code API generation

9. LiteLLM

   For multi-provider LLM integrations

10. Bifrost

    With semantic caching for LLM costs

Open Source API Gateway Software Selection Criteria

When selecting the best open source API gateway software to include in this list, I considered common buyer needs and pain points like enforcing consistent API security controls and supporting hybrid or multi-cloud deployments. I also used the following framework to keep my evaluation structured and fair:

Core Functionality (25% of total score)
To be considered for inclusion in this list, each solution had to fulfill these common use cases:

• Route and proxy API requests
• Apply authentication and authorization policies
• Enforce rate limiting and API quotas
• Provide logging and analytics for API traffic
• Support versioning and backward compatibility

Additional Standout Features (25% of total score)
To help further narrow down the competition, I also looked for unique features, such as:

• Native support for asynchronous and event-driven APIs
• Built-in developer portal with API documentation
• Native integration with CI/CD pipelines
• Real-time traffic monitoring dashboards
• Automated threat detection and mitigation

Usability (10% of total score)
To get a sense of the usability of each system, I considered the following:

• Clean and intuitive admin interface
• Customizable dashboards and reporting
• Accessible API documentation
• Contextual help or tooltips in-app
• Efficient policy management workflow

Onboarding (10% of total score)
To evaluate the onboarding experience for each platform, I considered the following:

• Step-by-step setup guides and documentation
• Availability of training videos or webinars
• Example configuration templates or blueprints
• Self-serve product tours or sandboxes
• Migration support tools or services

Customer Support (10% of total score)
To assess each software provider’s customer support services, I considered the following:

• Multiple support channels, including chat and email
• Availability of 24/7 support for paid plans
• Access to community forums or user groups
• Responsiveness to technical issues or bug reports
• Regular updates addressing support tickets

Value For Money (10% of total score)
To evaluate the value for money of each platform, I considered the following:

• Transparent open source licensing and costs
• Full feature set available in the free plan
• Affordable paid add-ons, if applicable
• Competitive pricing compared to alternatives
• Clear differentiation between free and paid features

Customer Reviews (10% of total score)
To get a sense of overall customer satisfaction, I considered the following when reading customer reviews:

• Positive comments on reliability and stability
• Feedback on the learning curve and documentation
• User satisfaction with support responsiveness
• Experiences with scaling and integration
• Reports of any frequent bugs or limitations

How to Choose Open Source API Gateway Software

It’s easy to get bogged down in long feature lists and complex pricing structures. To help you stay focused as you work through your unique software selection process, here’s a checklist of factors to keep in mind:

What is an Open Source API Gateway Software?

Open source API gateway software is a tool that manages, secures, and monitors traffic between backend services and external clients through standardized APIs. They help organizations control authentication, traffic routing, throttling, and observability for APIs. By being open source, they provide transparency, flexibility, and community-driven improvements for integration and deployment.

Features of Open Source API Gateway Software

When selecting open source API gateway software, keep an eye out for the following key features:

• Traffic routing: Direct requests to the correct backend services, balancing load and enforcing routing rules based on URL, headers, or other request parameters.
• Authentication and authorization: Enforce identity checks and grant access based on credentials, tokens, or integrations with identity providers to keep APIs secure.
• Rate limiting and quotas: Control how often clients can access APIs over time, preventing abuse and ensuring reliability for all users.
• API versioning: Enable seamless support for multiple API versions, allowing you to maintain backward compatibility during upgrades or changes.
• Logging and analytics: Collect detailed metrics for monitoring API calls, latency, errors, and usage trends, helping teams troubleshoot issues and optimize performance.
• Policy enforcement: Apply consistent rules such as caching, rewriting, throttling, or IP restrictions with customizable policies that govern API behaviour.
• Service discovery: Automatically register, find, and connect to backend services as they scale or change, reducing manual configuration and errors.
• Developer portal: Offer a self-service portal where developers can discover, test, and subscribe to APIs with access to up-to-date documentation.
• Threat protection: Protect APIs against common attacks such as SQL injection, cross-site scripting, and denial-of-service, with built-in security filters and protocols.
• Flexible deployment options: Deploy gateways on-premises, in the cloud, or in hybrid modes, adapting to your infrastructure and compliance needs.

Benefits of Open Source API Gateway Software

Implementing open source API gateway software provides several benefits for your team and your business. Here are a few you can look forward to:

• Consistent API security: Automatically enforce authentication, authorization, and threat protection across all services from a central point.
• Simplified traffic management: Route, limit, and monitor API calls, making it easier to maintain uptime and reliability amid changing workloads.
• Flexibility and customization: Adjust routing rules, policies, and integrations to match unique technical requirements without vendor lock-in.
• Transparent ownership and cost: Access source code, control deployments, and avoid unpredictable licensing fees by using open standards.
• Scalability for growth: Support increasing API traffic and additional services by scaling gateway instances with your infrastructure.
• Faster API onboarding: Provide developers with self-service portals, documentation, and clear versioning for quicker integrations and smoother handoffs.
• Community-driven innovation: Benefit from regular updates, new features, and best practices contributed by a global development community.

Costs and Pricing of Open Source API Gateway Software

Selecting open source API gateway software requires an understanding of the various pricing models and plans available. Costs vary based on features, team size, add-ons, and more. The table below summarizes common plans, their average prices, and typical features included in open source API gateway software solutions:

Plan Comparison Table for Open Source API Gateway Software