Fastly Next-Gen WAF (Signal Sciences) vs ModSecurity Open Source WAF

Fastly Next-Gen WAF (Signal Sciences) edges out in this comparison, offering Modern DevOps teams, API-heavy applications, organizations frustrated with false positives, companies needing flexible deployment options. However, ModSecurity Open Source WAF may be better suited if Security teams with WAF expertise, organizations with strict budget constraints, those needing maximum customization, educational purposes.

View Fastly Next-Gen WAF (Signal Sciences) Review View ModSecurity Open Source WAF Review

Fastly Next-Gen WAF (Signal Sciences) and ModSecurity Open Source WAF take fundamentally different approaches to web application security. Understanding your infrastructure and team capabilities will help determine which approach fits your needs.

Overview

Fastly Next-Gen WAF (Signal Sciences) and ModSecurity Open Source 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.

The original open source WAF engine powering countless applications, offering unmatched flexibility for those willing to manage their own security infrastructure.

Quick Comparison

Feature	Fastly Next-Gen WAF (Signal Sciences)	ModSecurity Open Source WAF
Overall Rating	4.5/5	4.0/5
Free Tier	No	Yes
Pricing Model	Custom pricing based on requests and features	Free (Open Source)
Ease of Use	4.0/5	2.5/5
Value for Money	3.8/5	4.8/5
Support	4.5/5	3.0/5
Open Source	No	Yes
Platforms	Any web application, AWS, GCP, Azure, Kubernetes, Docker, Serverless, Nginx, Apache	Apache, Nginx, IIS, Kubernetes (via Ingress), Docker, any platform via libmodsecurity
Compliance	SOC 2 Type II, PCI DSS, ISO 27001, HIPAA, GDPR	N/A (varies by implementation)

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

View full pricing →

ModSecurity Open Source WAF

Model: Free (Open Source)

Free Tier Available

Community Edition

Free

Commercial Support

Varies by vendor

View full pricing →

Features Comparison

Fastly Next-Gen WAF (Signal Sciences)

SmartParse Technology
Intelligent parsing technology that understands application context to reduce false positives by 90%+.
Power Rules
Flexible rule language for creating custom detection and response logic based on any request attribute.
API Discovery
Automatic discovery and cataloging of API endpoints with security assessment.
DevOps Integration
Native integrations with CI/CD tools, infrastructure as code support, and developer-friendly APIs.
Multi-Environment Deployment
Deploy as cloud service, agent, or edge module across diverse infrastructure.
Real-Time Dashboards
Live visibility into attacks, decisions, and application health without sampling.

ModSecurity Open Source WAF

OWASP Core Rule Set
Comprehensive, community-maintained rule set providing protection against OWASP Top 10 and more.
Custom Rules
Powerful SecRule language for creating custom detection logic based on any request/response attribute.
Real-Time Request Analysis
Inspect and analyze every HTTP transaction with access to full request and response data.
Audit Logging
Detailed logging of security events for forensics, compliance, and monitoring.
Virtual Patching
Create temporary rules to protect against vulnerabilities while permanent fixes are developed.
Data Loss Prevention
Inspect response bodies to prevent sensitive data leakage.

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

Learn more →

ModSecurity Open Source WAF

You need: Security teams with WAF expertise, organizations with strict budget constraints, those needing maximum customization, educational purposes
You want to start with a free tier
You prefer open-source solutions
You're using: Apache, Nginx, IIS, Kubernetes (via Ingress), Docker, any platform via libmodsecurity

Learn more →

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 is better for startups: Fastly Next-Gen WAF (Signal Sciences) or ModSecurity Open Source WAF?

ModSecurity Open Source WAF offers a free tier while Fastly Next-Gen WAF (Signal Sciences) does not, making ModSecurity Open Source WAF more accessible for budget-conscious startups. Fastly Next-Gen WAF (Signal Sciences) scores higher for ease of use (4.0/5), which is valuable for smaller teams. Consider your immediate security needs and growth plans when choosing.

Which has better support: Fastly Next-Gen WAF (Signal Sciences) or ModSecurity Open Source WAF?

Fastly Next-Gen WAF (Signal Sciences) has a higher support rating (4.5/5) compared to ModSecurity Open Source WAF (3.0/5). 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 ModSecurity Open Source WAF?

Fastly Next-Gen WAF (Signal Sciences) scores higher for ease of use (4.0/5) versus ModSecurity Open Source WAF (2.5/5). The actual implementation effort depends on your existing infrastructure and team expertise.

Which is more cost-effective: Fastly Next-Gen WAF (Signal Sciences) or ModSecurity Open Source WAF?

ModSecurity Open Source WAF offers a free tier while Fastly Next-Gen WAF (Signal Sciences) requires a paid plan. ModSecurity Open Source WAF scores higher for value (4.8/5). 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 ModSecurity Open Source WAF?

Fastly Next-Gen WAF (Signal Sciences) explicitly supports AWS while ModSecurity Open Source WAF's AWS integration may vary. Consider whether native AWS integration or cross-cloud portability matters more for your use case.