open-appsec vs Solid Security (formerly iThemes Security)
Both open-appsec and Solid Security (formerly iThemes Security) are capable WAF solutions. The right choice depends on your specific infrastructure, budget, and feature requirements.
Overview
open-appsec and Solid Security (formerly iThemes Security) are both popular web application firewall solutions. This comparison will help you understand the key differences and choose the right one for your needs.
Machine learning-based open source WAF that uses contextual AI to detect threats without signatures or rules, with native integration for NGINX, Kong, Envoy, and Kubernetes ingress controllers.
Comprehensive WordPress security plugin with Patchstack-powered firewall rules, virtual patching, two-factor authentication, and site scanning for proactive protection.
Quick Comparison
| Feature | open-appsec | Solid Security (formerly iThemes Security) |
|---|---|---|
| Overall Rating | 4.1/5 | 4.1/5 |
| Free Tier | Yes | Yes |
| Pricing Model | Free open source, managed cloud SaaS available | Freemium (Free tier + annual Pro license) |
| Ease of Use | 4.3/5 | 4.3/5 |
| Value for Money | 4.6/5 | 4.2/5 |
| Support | 3.7/5 | 4.0/5 |
| Open Source | Yes | Yes |
| Platforms | Docker, Kubernetes, Linux, NGINX, Kong Gateway, Envoy | WordPress (self-hosted) |
| Compliance | Supports OWASP Top 10 and API Top 10 protection | Contact vendor |
Pricing Comparison
open-appsec
Model: Free open source, managed cloud SaaS available
Free Tier AvailableOpen Source
Free
SaaS Management
Free tier available, paid plans for higher traffic
Solid Security (formerly iThemes Security)
Model: Freemium (Free tier + annual Pro license)
Free Tier AvailableFree
$0
Pro (1 site)
$99/year (~$8.25/month)
Pro (multi-site)
From $199/year
Features Comparison
open-appsec
-
ML-Based Detection
Pre-trained machine learning engine detects threats based on context and intent, not signatures. No rule tuning required.
-
Automatic Learning
Continuously learns application-specific traffic patterns in production, reducing false positives over time without manual intervention.
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Native Proxy Integration
Runs as a module inside NGINX, Kong, or Envoy rather than as a separate proxy, eliminating additional network hops and latency.
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Kubernetes Ingress
Functions as a Kubernetes Ingress Controller with built-in WAF, providing security at the ingress layer without sidecars or service mesh.
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API Protection
Protects REST APIs against OWASP API Top 10 threats using the same ML engine, with automatic API discovery and schema enforcement.
-
Anti-Bot
Detects and mitigates automated attacks, credential stuffing, and web scraping using behavioral analysis.
Solid Security (formerly iThemes Security)
-
Patchstack Firewall
Virtual patching rules powered by Patchstack that protect against known plugin and theme vulnerabilities automatically.
-
Two-Factor Authentication
Multiple 2FA methods including authenticator apps, email codes, and backup codes for all user roles.
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Passwordless Login
Login via passkeys and biometrics, eliminating password-based attacks entirely (Pro feature).
-
Site Scanner
Checks for known malware, vulnerabilities in plugins and themes, and blocklist status.
-
File Change Detection
Monitors WordPress core files and alerts when unexpected changes are detected.
-
Security Dashboard
Unified dashboard showing security status, recent events, and actionable recommendations.
-
Trusted Devices
Recognizes trusted devices and restricts admin access from unknown devices (Pro feature).
Which One Is Right for You?
The best WAF depends on your specific requirements, infrastructure, and team expertise.
open-appsec
- You need: Kubernetes environments, teams using NGINX or Kong, organizations wanting hands-off WAF protection, cloud-native applications, DevOps teams that do not want to manage WAF rules
- You want to start with a free tier
- You prefer open-source solutions
- You're using: Docker, Kubernetes, Linux, NGINX, Kong Gateway, Envoy
Solid Security (formerly iThemes Security)
- You need: WordPress agencies managing multiple sites, users wanting modern authentication features like passkeys, sites needing automatic virtual patching for plugin vulnerabilities
- You want to start with a free tier
- You prefer open-source solutions
- You're using: WordPress (self-hosted)
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: open-appsec or Solid Security (formerly iThemes Security)?
Both open-appsec and Solid Security (formerly iThemes Security) offer free tiers, making them accessible for startups. Consider your immediate security needs and growth plans when choosing.
Which has better support: open-appsec or Solid Security (formerly iThemes Security)?
Solid Security (formerly iThemes Security) has a higher support rating (4.0/5) compared to open-appsec (3.7/5). 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: open-appsec or Solid Security (formerly iThemes Security)?
Solid Security (formerly iThemes Security) scores higher for ease of use (4.3/5) versus open-appsec (4.3/5). The actual implementation effort depends on your existing infrastructure and team expertise.
Which is more cost-effective: open-appsec or Solid Security (formerly iThemes Security)?
Both providers offer free tiers, making it easy to start without commitment. open-appsec scores higher for value (4.6/5). Total cost depends on your traffic volume, required features, and support level needs.
Which is better for WordPress: open-appsec or Solid Security (formerly iThemes Security)?
Solid Security (formerly iThemes Security) explicitly supports WordPress while open-appsec takes a more platform-agnostic approach. For WordPress-specific threats like plugin vulnerabilities and brute force attacks, look for providers with WordPress-specific rule sets.