Most WordPress security plugins do keyword matching on SQL injection: if the request contains "UNION" and "SELECT," block it. They false-positive on legitimate blog comments and miss most real attacks. GuardPress uses grammar-based detection across all 7 classical injection vectors, plus a real WAF, malware scanner, per-role 2FA, file integrity monitoring, security headers, and 30-day audit log. 100% server-side, no cloud dependency. Premium from $59/yr.