ModSecurity is an open-source web application firewall (WAF) that can help protect web applications from various attacks.
Best Imperva WAF Alternatives ranked by AI · updated May 2025
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Imperva's Web Application Firewall provides advanced security features for protecting web applications.
Price: Paid
Top 6 Imperva WAF alternatives
WAF is a security solution that monitors, filters, and blocks HTTP traffic to and from a web application to protect against various...
Starting at $500 per month
Akamai Web Application Protector is a cloud-based web application firewall (WAF) service that helps protect applications from a variety of threats.
Contact Akamai for pricing
AppTrana is a managed web application and API security service for organizations that need WAF protection without operating rules and tuning themselves....
Pros
- Managed rule creation and tuning reduces WAF maintenance compared with self-managed services
- Includes application vulnerability scanning and managed penetration testing options
- Supports web applications and APIs with DDoS and bot protection
Cons
- Less globally extensive than Cloudflare and Akamai edge networks
- Advanced capabilities and higher usage levels require more expensive plans
- Less flexible for teams that want to manage every WAF rule directly
From $99/mo
Cloudflare Web Application Firewall (WAF) protects websites from malicious traffic and attacks.
Varies based on plan
FortiWeb is a web application firewall for protecting websites, APIs, and web services from application-layer attacks. It is designed for enterprises that...
Pros
- Supports hardware, virtual machine, public cloud, and SaaS deployment models
- Integrates with Fortinet Security Fabric and FortiGate environments
- Includes machine-learning-assisted threat detection and API protection
Cons
- Generally requires a sales quote and can cost more than cloud-native WAF services
- More operationally complex than fully managed providers such as Cloudflare
- Best value often depends on an existing Fortinet security deployment
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