BitNinja is built for hosting providers running shared servers. If you manage VPS, dedicated servers, Docker hosts, or Kubernetes clusters, Defensia gives you more coverage at a lower price — with an open-source agent you can audit.
$ Create BitNinja account + select plan
$ Install agent on each server
# Configure WAF module settings...
# Set up IP reputation thresholds...
# Review Defense Network policies...
# Configure log analysis parsers...
# Multiple modules to tune individually
$14-52/server/month (paid tiers)
$ curl -fsSL https://defensia.cloud/install.sh | sudo bash
✓ SSH protection active (15 patterns)
✓ Web firewall active (nginx + Apache)
✓ Malware scanner ready
✓ Dashboard connected
✓ CVE scanner running
✓ Real-time alerts ready
30 seconds. Zero config files.
BitNinja works well for hosting providers managing shared servers. But once you look closer, the trade-offs become clear:
BitNinja's paid plans range from $14 to $52 per server per month (USD). They also have a VPS 6 tier at $6/month. Their VPS Free tier is limited to 2 vCPU, 2GB RAM, and 10 hosted users. Defensia Pro is €9/month per server (€7 billed annually) with all features included.
BitNinja targets shared hosting providers running cPanel or Plesk. If you manage VPS, bare metal, Docker, or Kubernetes, you're paying for features designed for a different audience. Defensia is built for sysadmins and DevOps engineers.
BitNinja's agent is fully proprietary. You can't inspect what it does on your server. Defensia's agent is MIT licensed, written in Go, and open source on GitHub. You can read every line of code.
WAF module, IP Reputation, Log Analysis, DoS Detection, Malware Detection, Defense Network — BitNinja has many separate modules that each need configuration and tuning. Defensia works out of the box with zero config files.
BitNinja requires minimum 1GB RAM and real-world reports show 90-96% RAM usage on 4-8GB servers. Their old inotify watcher could consume 3GB alone (now replaced by auditd). Defensia's Go agent uses under 30MB of memory — even during malware scans it stays under 50MB.
BitNinja's crowd-sourced Defense Network can block legitimate IPs that were flagged by other servers. Shared IP addresses (cloud providers, mobile networks) get caught in the crossfire. Defensia blocks based on actual attacks against your server.
Side by side, feature by feature.
| Feature | Defensia | BitNinja |
|---|---|---|
| Install time | ~30 seconds | ~5-10 min + config |
| Configuration required | Zero config | Module-by-module |
| Works on any Linux server | ✓ | ✓ |
| SSH brute force protection | 15 patterns | ✓ |
| Web Application Firewall | 15+ OWASP types | Coraza-Caddy engine |
| Malware scanning | 64K+ hashes + 684 patterns | ✓ |
| WordPress database scanning | ✓ | ✗ |
| Quarantine & remediation | ✓ | ✓ |
| Security posture score | 0-100, A-F grade | ✗ |
| CVE & vulnerability scanning | OS-level (NVD + EPSS + KEV) | CMS-level patching only |
| Geoblocking (200+ countries) | ✓ | ✗ |
| Bot management | 70+ fingerprints | ✓ |
| Real-time dashboard | ✓ | ✓ |
| Multi-server management | ✓ | ✓ |
| Docker native support | ✓ | ✗ |
| Kubernetes / Helm | ✓ | ✗ |
| Crowd-sourced IP reputation | ✗ | ✓ |
| Open source agent | MIT licensed | ✗ |
| Alerts (Slack/email/Discord) | ✓ | Email only |
| nftables support | ✓ | ✗ |
| ARM architecture | ✓ | ✗ |
| Memory usage | <30 MB | 1GB+ minimum |
| Free tier | 1 server, full dashboard | 1 VPS (≤2 vCPU, ≤2GB RAM) |
| Price (per server/month) | Free + €9/mo Pro | $6-52/mo (USD) |
These are capabilities BitNinja either lacks entirely or charges extra for.
Defensia scans your installed OS packages against the NVD database, scores them with EPSS exploit probability, and flags CISA KEV entries. BitNinja has a CMS-level vulnerability patcher for web apps, but doesn't scan OS packages (OpenSSH, nginx, kernel) for CVEs.
Deploy as a container, DaemonSet, or Helm chart. Defensia detects Docker containers, monitors ingress logs, and protects entire K8s clusters. BitNinja installs on the host only — log analysis doesn't work in containerized environments, and K8s support is limited.
64,000+ hash signatures, 684 dynamic detection patterns, web shell scanning, cryptominer detection, rootkit checks, WP database scanning for injected posts and rogue admins, automatic quarantine, and a 0-100 security posture score.
We believe in being honest. Here are cases where BitNinja might suit you better:
For VPS, dedicated servers, Docker hosts, and Kubernetes clusters — yes. Defensia covers SSH protection (15 patterns), WAF (15+ OWASP types), malware scanning (64K+ hashes), CVE scanning, geoblocking, bot management, and real-time monitoring. The one area where BitNinja has an edge is crowd-sourced IP reputation through their Defense Network, which Defensia doesn't replicate.
Both offer a free tier for one server. BitNinja VPS Free is limited to servers with max 2 vCPU, 2GB RAM, and 10 hosted users. Defensia's free plan has no hardware limits — it includes SSH protection, the full real-time dashboard, and bot detection for one server. For a fair comparison, try both on the same server.
Yes. The agent is MIT licensed and available on GitHub. Written in Go, it uses under 30MB of memory. You can audit every line of code, build from source, and contribute. BitNinja's agent is fully proprietary.
BitNinja: VPS Free for 1 small server, VPS 6 at $6/month, then $14-52/server/month depending on hosted users (all USD). Bulk pricing from $5/server requires 5+ servers. Defensia: free for 1 server, then €9/server/month (€7 billed annually). At 10 servers with unlimited users: $520/month with BitNinja vs €90/month with Defensia.
BitNinja's Defense Network is a genuine advantage — they maintain a database of 100M+ IP addresses and ~1.3M actively greylisted IPs, crowd-sourced across all BitNinja installations. Suspicious IPs get a CAPTCHA challenge before accessing your site. However, this can cause false positives on shared IPs (cloud providers, mobile networks). Defensia blocks based on actual attacks against your specific server, which is more precise but doesn't benefit from crowd intelligence.
Ubuntu 20+, Debian 11+, CentOS 7+, RHEL 8+, Rocky Linux, AlmaLinux, Fedora 36+, and Amazon Linux 2023. The agent requires systemd, iptables, and root access. BitNinja supports a similar range of distributions.
Sources
BitNinja pricing (bitninja.com/pricing), system requirements and compatibility (doc.bitninja.io), changelog (doc.bitninja.io/docs/changelog). Defense Network IP statistics from bitninja.com/cybersecurity-solutions/ip-reputation. Memory usage reports from Enhance community forums. Defensia agent telemetry data. All pricing and features verified April 2026.
Install Defensia in 30 seconds. Free plan includes 1 server, SSH protection, and the real-time dashboard. Open-source agent. No vendor lock-in.
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