Fastly Next-Gen WAF (Signal Sciences) vs Kong Gateway WAF
Both Fastly Next-Gen WAF (Signal Sciences) and Kong Gateway WAF are capable WAF solutions. The right choice depends on your specific infrastructure, budget, and feature requirements.
Overview
Fastly Next-Gen WAF (Signal Sciences) 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.
Developer-friendly WAF using proprietary SmartParse technology, offering low false positives and seamless DevOps integration for modern application security.
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 | Fastly Next-Gen WAF (Signal Sciences) | Kong Gateway WAF |
|---|---|---|
| Overall Rating | 4.5/5 | 3.8/5 |
| Free Tier | No | No |
| Pricing Model | Custom pricing based on requests and features | Tiered (Plus per-gateway + Enterprise custom) |
| Ease of Use | 4.0/5 | 3.2/5 |
| Value for Money | 3.8/5 | 3.0/5 |
| Support | 4.5/5 | 4.2/5 |
| Platforms | Any web application, AWS, GCP, Azure, Kubernetes, Docker, Serverless, Nginx, Apache | Linux (Ubuntu, RHEL, Debian, Amazon Linux, Alpine), Docker, Kubernetes (via Ingress Controller and Operator), AWS, Azure, GCP, ARM64, macOS (dev) |
| Compliance | SOC 2 Type II, PCI DSS, ISO 27001, HIPAA, GDPR | SOC 2 Type II, FIPS 140-2 (Enterprise data planes), supports PCI DSS and HIPAA compliance |
Pricing Comparison
Fastly Next-Gen WAF (Signal Sciences)
Model: Custom pricing based on requests and features
Essential
Custom pricing
Professional
Custom pricing
Premier
Custom pricing
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
Fastly Next-Gen WAF (Signal Sciences)
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SmartParse Technology
Intelligent parsing technology that understands application context to reduce false positives by 90%+.
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Power Rules
Flexible rule language for creating custom detection and response logic based on any request attribute.
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API Discovery
Automatic discovery and cataloging of API endpoints with security assessment.
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DevOps Integration
Native integrations with CI/CD tools, infrastructure as code support, and developer-friendly APIs.
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Multi-Environment Deployment
Deploy as cloud service, agent, or edge module across diverse infrastructure.
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Real-Time Dashboards
Live visibility into attacks, decisions, and application health without sampling.
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.
Fastly Next-Gen WAF (Signal Sciences)
- You need: Modern DevOps teams, API-heavy applications, organizations frustrated with false positives, companies needing flexible deployment options
- You're using: Any web application, AWS, GCP, Azure, Kubernetes, Docker, Serverless, Nginx, Apache
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: Fastly Next-Gen WAF (Signal Sciences) or Kong Gateway WAF?
Fastly Next-Gen WAF (Signal Sciences) has a higher support rating (4.5/5) compared to Kong Gateway WAF (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: Fastly Next-Gen WAF (Signal Sciences) or Kong Gateway WAF?
Fastly Next-Gen WAF (Signal Sciences) scores higher for ease of use (4.0/5) versus Kong Gateway WAF (3.2/5). The actual implementation effort depends on your existing infrastructure and team expertise.
Which is more cost-effective: Fastly Next-Gen WAF (Signal Sciences) or Kong Gateway WAF?
Neither provider offers a completely free tier. Fastly Next-Gen WAF (Signal Sciences) 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: Fastly Next-Gen WAF (Signal Sciences) or Kong Gateway WAF?
Both Fastly Next-Gen WAF (Signal Sciences) and Kong Gateway WAF support AWS deployments. Consider whether native AWS integration or cross-cloud portability matters more for your use case.
Which is better for enterprise: Fastly Next-Gen WAF (Signal Sciences) or Kong Gateway WAF?
Kong Gateway WAF is positioned for enterprise use cases, while Fastly Next-Gen WAF (Signal Sciences) may be more suited for small to mid-market organizations. Both offer compliance certifications important for enterprise. Enterprise buyers should evaluate SLAs, support options, and integration capabilities.