Azure Web Application Firewall vs Kong Gateway WAF
Both Azure Web Application Firewall and Kong Gateway WAF are capable WAF solutions. The right choice depends on your specific infrastructure, budget, and feature requirements.
Overview
Azure Web Application Firewall and Kong Gateway WAF are both popular web application firewall solutions. This comparison will help you understand the key differences and choose the right one for your needs.
Microsoft's cloud-native WAF integrated with Azure Application Gateway and Front Door, offering enterprise-grade protection with deep Azure ecosystem integration.
API gateway with built-in WAF plugin for enterprise customers. Kong is the most popular open source API gateway (35K+ GitHub stars, 312M+ downloads) built on NGINX, processing 400B+ API calls daily. The WAF plugin is an Enterprise-only add-on that protects API endpoints at the gateway layer.
Quick Comparison
| Feature | Azure Web Application Firewall | Kong Gateway WAF |
|---|---|---|
| Overall Rating | 4.2/5 | 3.8/5 |
| Free Tier | No | No |
| Pricing Model | Pay-per-use (gateway hours + data processed) | Tiered (Plus per-gateway + Enterprise custom) |
| Ease of Use | 3.5/5 | 3.2/5 |
| Value for Money | 3.8/5 | 3.0/5 |
| Support | 4.2/5 | 4.2/5 |
| Platforms | Azure Application Gateway, Azure Front Door, Azure CDN, Azure Spring Apps | Linux (Ubuntu, RHEL, Debian, Amazon Linux, Alpine), Docker, Kubernetes (via Ingress Controller and Operator), AWS, Azure, GCP, ARM64, macOS (dev) |
| Compliance | SOC 1/2/3, PCI DSS, HIPAA, FedRAMP High, ISO 27001, ISO 27018 | SOC 2 Type II, FIPS 140-2 (Enterprise data planes), supports PCI DSS and HIPAA compliance |
Pricing Comparison
Azure Web Application Firewall
Model: Pay-per-use (gateway hours + data processed)
Application Gateway WAF v2
~$0.443/hour + $0.008/GB
Front Door Standard
$35/month base + usage
Front Door Premium
$330/month base + usage
Kong Gateway WAF
Model: Tiered (Plus per-gateway + Enterprise custom)
Kong Gateway OSS
Free
Kong Konnect Plus
From $225/mo
Kong Konnect Enterprise
Custom (annual)
Dedicated Cloud Gateway
$500/mo per control plane + $0.15/GB
Features Comparison
Azure Web Application Firewall
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OWASP Core Rule Set
Pre-configured protection against OWASP Top 10 vulnerabilities with regularly updated rule sets.
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Custom Rules
Create custom rules based on geo-location, IP address, request attributes, and rate limiting.
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Bot Protection
Managed bot protection ruleset to detect and mitigate malicious bot traffic (Premium tier).
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Per-Site Policies
Apply different WAF policies to different sites behind the same gateway.
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Exclusion Lists
Fine-tune rules by excluding specific request attributes to reduce false positives.
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Geo-Filtering
Allow or block traffic based on country/region of origin.
Kong Gateway WAF
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Gateway-Embedded WAF
WAF runs as a plugin inside the Kong Gateway process, inspecting API traffic at the same layer where routing, authentication, and rate limiting occur. No separate WAF appliance or additional proxy hop needed.
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OWASP Top 10 Protection
Built-in protection against common web application attacks including SQL injection, cross-site scripting, command injection, and path traversal at the API gateway layer.
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Plugin Ecosystem
Over 100 plugins for security, traffic control, authentication, and observability. WAF works alongside bot detection, IP restriction, CORS, ACL, and rate limiting plugins in a configurable execution chain.
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Third-Party WAF Integrations
Open plugin architecture supports third-party WAF engines including open-appsec (ML-driven detection) and Wallarm (API security). Teams can choose the WAF engine that fits their threat model.
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Kubernetes-Native Deployment
Kong Ingress Controller and Kong Kubernetes Operator provide native Kubernetes integration. WAF policies can be managed declaratively through Kubernetes CRDs alongside gateway configuration.
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Hybrid Mode
Cloud-managed control plane with self-hosted data planes. WAF policies are centrally managed and distributed to data planes running in any environment, including air-gapped networks.
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AI Gateway
Dedicated AI gateway capabilities including LLM proxy, token-based rate limiting, semantic caching, PII sanitization, prompt guardrails, and MCP server proxy. WAF protects AI endpoints alongside traditional APIs.
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Declarative Configuration
Gateway and WAF configuration can be managed as code through declarative YAML/JSON, enabling GitOps workflows and CI/CD pipeline integration for security policy changes.
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Advanced Rate Limiting
Enterprise-grade rate limiting with sliding window counters, consumer groups, and cluster-wide synchronization. Works in conjunction with WAF to prevent both application-layer attacks and abuse.
Which One Is Right for You?
The best WAF depends on your specific requirements, infrastructure, and team expertise.
Azure Web Application Firewall
- You need: Azure-native applications, Microsoft enterprise customers, government and regulated industries, global applications needing edge protection
- You're using: Azure Application Gateway, Azure Front Door, Azure CDN, Azure Spring Apps
Kong Gateway WAF
- You need: Organizations already using Kong as their API gateway, Kubernetes-native architectures needing gateway-level WAF, teams wanting unified API management and security in one platform, enterprises with microservices architectures routing all traffic through an API gateway
- You're using: Linux (Ubuntu, RHEL, Debian, Amazon Linux, Alpine), Docker, Kubernetes (via Ingress Controller and Operator), AWS, Azure, GCP, ARM64, macOS (dev)
We recommend evaluating both options with a trial or free tier before committing. Consider your existing infrastructure, team expertise, compliance requirements, and budget.
Frequently Asked Questions
Which has better support: Azure Web Application Firewall or Kong Gateway WAF?
Kong Gateway WAF has a higher support rating (4.2/5) compared to Azure Web Application Firewall (4.2/5). However, support quality can vary based on your plan tier - enterprise customers typically receive more responsive support from both providers. Consider evaluating support during a trial period.
Which is easier to implement: Azure Web Application Firewall or Kong Gateway WAF?
Azure Web Application Firewall scores higher for ease of use (3.5/5) versus Kong Gateway WAF (3.2/5). The actual implementation effort depends on your existing infrastructure and team expertise.
Which is more cost-effective: Azure Web Application Firewall or Kong Gateway WAF?
Neither provider offers a completely free tier. Azure Web Application Firewall scores higher for value (3.8/5). Total cost depends on your traffic volume, required features, and support level needs.
Which works better with AWS: Azure Web Application Firewall or Kong Gateway WAF?
Kong Gateway WAF explicitly supports AWS while Azure Web Application Firewall's AWS integration may vary. Consider whether native AWS integration or cross-cloud portability matters more for your use case.
Which is better for enterprise: Azure Web Application Firewall or Kong Gateway WAF?
Both Azure Web Application Firewall and Kong Gateway WAF are well-suited for enterprise deployments. Both offer compliance certifications important for enterprise. Enterprise buyers should evaluate SLAs, support options, and integration capabilities.