Fastly Next-Gen WAF (Signal Sciences) vs Tempesta FW

Fastly Next-Gen WAF (Signal Sciences) and Tempesta FW take different approaches to web application security. Consider your team's expertise and infrastructure preferences when evaluating these options.

View Fastly Next-Gen WAF (Signal Sciences) Review View Tempesta FW Review

Fastly Next-Gen WAF (Signal Sciences) and Tempesta FW 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 Tempesta FW 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.

High-performance open-source WAF and web accelerator built directly into the Linux kernel, delivering up to 1.8M requests per second with integrated L3-L7 DDoS protection and automated bot mitigation via WebShield.

Quick Comparison

Feature	Fastly Next-Gen WAF (Signal Sciences)	Tempesta FW
Overall Rating	4.5/5	4.0/5
Free Tier	No	Yes
Pricing Model	Custom pricing based on requests and features	Free (open source) + professional services
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	Linux (kernel-level integration), bare metal, cloud VMs
Compliance	SOC 2 Type II, PCI DSS, ISO 27001, HIPAA, GDPR	Contact vendor

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 →

Tempesta FW

Model: Free (open source) + professional services

Free Tier Available

Open Source

Free

Professional Services

Contact for pricing

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.

Tempesta FW

Kernel-Level Performance
Built directly into Linux TCP/IP stack, processing up to 1.8M HTTP requests per second - 3x faster than Nginx or HAProxy.
Multi-Layer DDoS Protection
Integrated protection against volumetric and application-layer DDoS attacks with rate limiting, JavaScript challenges, and adaptive QoS.
HTTP Tables
Extends Linux iptables/nftables for application-layer filtering, enabling rules that combine IP addresses with HTTP headers and content.
Intelligent Load Balancing
Machine learning-powered load balancing with persistent sessions, weighted round-robin, and rendezvous hashing strategies.
Web Acceleration
Built-in caching using Tempesta DB, an ultra-fast in-memory database with NUMA-aware distribution and SIMD optimizations.
High-Performance TLS
Tempesta TLS is 40-80% faster than Nginx/OpenSSL with 4x lower latency for TLS handshakes.
Bot Protection (WebShield)
Open-source automated bot protection via WebShield — detects and blocks DDoS bots, scrapers, shopping bots, and booking bots using TLS and HTTP fingerprint analysis on access logs stored in ClickHouse.
Volumetric DDoS Protection
Upcoming open-source volumetric DDoS protection solution, completing a full L3-L7 DDoS and bot mitigation stack when combined with Tempesta FW's application-layer defences and WebShield.
Native XDP Integration
Uses Linux XDP (eXpress Data Path) for early packet dropping, enabling efficient mitigation of volumetric attacks.

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 →

Tempesta FW

You need: High-traffic sites requiring maximum performance, organizations with Linux expertise, teams wanting to replace multiple infrastructure components, performance-critical applications
You want to start with a free tier
You prefer open-source solutions
You're using: Linux (kernel-level integration), bare metal, cloud VMs

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 Tempesta FW?

Tempesta FW offers a free tier while Fastly Next-Gen WAF (Signal Sciences) does not, making Tempesta FW 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 Tempesta FW?

Fastly Next-Gen WAF (Signal Sciences) has a higher support rating (4.5/5) compared to Tempesta FW (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 Tempesta FW?

Fastly Next-Gen WAF (Signal Sciences) scores higher for ease of use (4.0/5) versus Tempesta FW (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 Tempesta FW?

Tempesta FW offers a free tier while Fastly Next-Gen WAF (Signal Sciences) requires a paid plan. Tempesta FW 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 Tempesta FW?

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