- Stars
- 20,981
- License
- GPL-3.0
- Last commit
- 5 months ago
GoStable
Best WAF & API Security Tools
Web application firewalls and API security gateways to protect against attacks.
Web Application Firewalls (WAF) and API security gateways sit at the edge of web services to filter malicious traffic, enforce policy, and mitigate known vulnerabilities. They protect against threats such as injection attacks, cross-site scripting, and API abuse by inspecting HTTP requests and responses in real time. Both open-source and commercial SaaS offerings exist, allowing organizations to choose a solution that matches their operational model. Open-source tools like ModSecurity, SafeLine, and Coraza can be self-hosted and customized, while cloud-native services such as AWS WAF and Azure Web Application Firewall provide managed scalability and integration with broader security ecosystems.
Top Open Source WAF & API Security platforms
- Stars
- 18,226
- License
- MIT
- Last commit
- 23 days ago
GoActive
- Stars
- 10,246
- License
- AGPL-3.0
- Last commit
- 20 days ago
PythonActive
- Stars
- 9,579
- License
- Apache-2.0
- Last commit
- 20 days ago
C++Active
- Stars
- 3,387
- License
- Apache-2.0
- Last commit
- 17 days ago
GoActive
UUSEC WAF
Industrial‑grade AI‑powered WAF with zero‑day defense and scalable protection
- Stars
- 1,622
- License
- BSD-2-Clause
- Last commit
- 23 days ago
ShellActive
Recently updated
17 days ago
Coraza delivers enterprise‑grade web application firewall protection using ModSecurity SecLang rules and full OWASP Core Rule Set v4 compatibility, with a focus on performance and extensibility.
What to evaluate
01Detection Accuracy
Measures how effectively the solution identifies true threats while minimizing false positives, often benchmarked against OWASP Top 10 attack patterns.
02Performance Impact
Assesses latency and throughput overhead introduced by inspection and rule processing, critical for high-traffic applications.
03Policy Flexibility
Evaluates the ability to create, modify, and prioritize custom rules, including support for scripting languages or rule-set imports.
04Integration Ecosystem
Looks at native connectors to CI/CD pipelines, SIEM platforms, container orchestrators, and API management layers.
05Community and Vendor Support
Considers the size of the open-source contributor base, frequency of updates, and availability of commercial support for SaaS options.
Common capabilities
Most tools in this category support these baseline capabilities.
- Signature-based attack detection
- Anomaly and behavior analytics
- Rate limiting and throttling
- IP reputation and geo-blocking
- OWASP Top 10 rule sets
- TLS termination and inspection
- Custom rule scripting (e.g., Lua, SecLang)
- Detailed logging and alerting
- Dashboard visualizations
- SIEM and third-party integration
- Automatic rule updates
- Support for container and serverless environments
Leading WAF & API Security SaaS platforms
AWS WAF
Web Application Firewall that protects web applications and APIs from common exploits and attacks by defining security rules
WAF & API Security
Alternatives tracked
6 alternatives
Azure Web Application Firewall
Cloud-native WAF service that protects web apps from common attacks (SQL injection, XSS) by filtering malicious HTTP/S traffic
WAF & API Security
Alternatives tracked
6 alternatives
Sophos
Unified threat management and endpoint security
WAF & API Security
Alternatives tracked
5 alternatives
Most compared product
6 open-source alternatives
AWS WAF (Web Application Firewall) is a web security service that helps protect web applications and APIs from common web exploits such as SQL injection and cross-site scripting by allowing you to configure custom security rules. It integrates with services like Amazon CloudFront, ALB, and API Gateway, enabling users to filter and block malicious HTTP(S) traffic at the edge and monitor requests, thereby improving application security against bots and attacks.
Leading hosted platforms
Frequently replaced when teams want private deployments and lower TCO.
Typical usage patterns
01Edge Deployment for Inbound Traffic
Place the WAF at the network edge to filter all external HTTP/S requests before they reach application servers.
02API Gateway Enforcement
Integrate API security rules directly into an API gateway to protect microservice endpoints and enforce rate limits.
03CI/CD Automated Rule Testing
Run security policies against staging environments during build pipelines to catch regressions before production release.
04Hybrid Cloud Protection
Deploy consistent rule sets across on-premises, public cloud, and container workloads to maintain uniform security posture.
05Runtime Anomaly Detection
Enable behavioral analytics that flag deviations from normal request patterns, supplementing signature-based rules.
Frequent questions
What is the primary difference between a WAF and an API security gateway?
A WAF focuses on protecting web applications by filtering HTTP traffic, while an API security gateway adds controls specific to API protocols, such as schema validation, rate limiting, and OAuth enforcement.
When should an organization choose an open-source WAF over a managed SaaS solution?
Open-source options are preferable when you need deep customization, have on-premises compliance constraints, or want to avoid recurring subscription costs. SaaS solutions are better for rapid deployment, automatic scaling, and reduced operational overhead.
How does rule latency affect application performance?
Each inspection rule adds processing time; high-volume environments should prioritize lightweight signatures and enable rule caching to keep added latency in the low-millisecond range.
Can WAFs be integrated into CI/CD pipelines?
Yes, many tools provide APIs or command-line interfaces that allow automated testing of rule sets against staging deployments, ensuring new policies do not break legitimate traffic before they reach production.
What steps can reduce false positives in a WAF deployment?
Start with a baseline rule set, tune thresholds based on observed traffic, whitelist known good endpoints, and regularly review alerts to adjust rules accordingly.
How do WAFs support compliance frameworks like PCI DSS?
WAFs can enforce required controls such as input validation, encryption, and logging, and many provide compliance reporting templates that map rule activity to PCI DSS requirements.