Azure Web Application Firewall vs Fastly Next-Gen WAF (Signal Sciences)
Fastly Next-Gen WAF (Signal Sciences) wins this comparison, particularly for Modern DevOps teams, API-heavy applications, organizations frustrated with false positives, companies needing flexible deployment options. That said, Azure Web Application Firewall remains a solid choice for Azure-native applications, Microsoft enterprise customers, government and regulated industries, global applications needing edge protection.
Overview
Azure Web Application Firewall and Fastly Next-Gen WAF (Signal Sciences) 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.
Developer-friendly WAF using proprietary SmartParse technology, offering low false positives and seamless DevOps integration for modern application security.
Quick Comparison
| Feature | Azure Web Application Firewall | Fastly Next-Gen WAF (Signal Sciences) |
|---|---|---|
| Overall Rating | 4.2/5 | 4.5/5 |
| Free Tier | No | No |
| Pricing Model | Pay-per-use (gateway hours + data processed) | Custom pricing based on requests and features |
| Ease of Use | 3.5/5 | 4.0/5 |
| Value for Money | 3.8/5 | 3.8/5 |
| Support | 4.2/5 | 4.5/5 |
| Platforms | Azure Application Gateway, Azure Front Door, Azure CDN, Azure Spring Apps | Any web application, AWS, GCP, Azure, Kubernetes, Docker, Serverless, Nginx, Apache |
| Compliance | SOC 1/2/3, PCI DSS, HIPAA, FedRAMP High, ISO 27001, ISO 27018 | SOC 2 Type II, PCI DSS, ISO 27001, HIPAA, GDPR |
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
Fastly Next-Gen WAF (Signal Sciences)
Model: Custom pricing based on requests and features
Essential
Custom pricing
Professional
Custom pricing
Premier
Custom pricing
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.
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.
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
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
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 Fastly Next-Gen WAF (Signal Sciences)?
Fastly Next-Gen WAF (Signal Sciences) has a higher support rating (4.5/5) 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 Fastly Next-Gen WAF (Signal Sciences)?
Fastly Next-Gen WAF (Signal Sciences) scores higher for ease of use (4.0/5) versus Azure Web Application Firewall (3.5/5). The actual implementation effort depends on your existing infrastructure and team expertise.
Which is more cost-effective: Azure Web Application Firewall or Fastly Next-Gen WAF (Signal Sciences)?
Neither provider offers a completely free tier. Total cost depends on your traffic volume, required features, and support level needs.
Which works better with AWS: Azure Web Application Firewall or Fastly Next-Gen WAF (Signal Sciences)?
Fastly Next-Gen WAF (Signal Sciences) 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 Fastly Next-Gen WAF (Signal Sciences)?
Azure Web Application Firewall 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.