Short answer: Self-hosting Nmap, Nuclei, and OWASP ZAP is free in license cost but not in time — you own template/script updates, a static source IP for allowlisting, storage of results, and report generation. A hosted console trades a per-scan or per-credit fee for zero maintenance, a stable scan origin, and built-in reporting. Self-host when scanning is core to your work and you have engineering time to spare; use hosted when you scan irregularly, need client-ready reports, or don't want to babysit template feeds.
TL;DR
- Tools are free; upkeep isn't. The real cost of self-hosting is engineering hours, not licenses.
- Hosted wins on: maintenance, a static source IP, stored history, and PDF reports out of the box.
- Self-hosted wins on: full control, custom tooling/scripts, data never leaving your network, and zero marginal scan cost at very high volume.
- The deciding factor is usually how often you scan and whether you produce reports for others.
The trade-off table
| Dimension | Self-hosted | Hosted |
|-----------|-------------|--------|
| License cost | $0 (open source) | Per-scan / per-credit / subscription |
| Setup time | Hours to days per tool | Minutes |
| Maintenance | You own updates, patches, add-ons | Vendor handles it |
| Nuclei templates | You run nuclei -ut; stale in days if not automated | Continuously synced |
| Source IP | Whatever your host/CI has (often dynamic) | Stable, allowlist-friendly |
| Result storage | You build it | Included, searchable history |
| Reporting | You script it (or none) | PDF/exports included |
| Data residency | Stays in your network | Leaves to the vendor |
| Scale | Your infra caps it | Vendor infra + concurrency |
| Marginal cost/scan | ~$0 | Per pricing model |
Where the hidden costs hide (self-hosted)
The download is free. These aren't:
- Template & script drift. Nuclei ships new templates almost every day. Without automated
nuclei -ut, your coverage silently ages. ZAP add-ons and Nmap NSE scripts drift too. - A static source IP. Client engagements almost always require you to give an IP to allowlist. Laptops, VPNs, and ephemeral CI runners don't provide a stable one — you end up standing up a dedicated box.
- Storage and history. "Where's the scan from three weeks ago?" is a real question. Someone has to build retention.
- Reporting. A raw Nuclei JSON blob isn't a deliverable. Turning findings into a client- or auditor-ready PDF is work every single time.
- Runtime & concurrency. A full ZAP active scan can run 30 minutes to 6 hours per target. Scale that across many targets and your one box becomes the bottleneck.
Where the hidden costs hide (hosted)
Hosted isn't free of trade-offs either:
- Recurring spend that scales with usage (see how hosted scanners price).
- Data leaves your network — findings live with the vendor. For some regulated or air-gapped environments that's a hard blocker.
- Less low-level control — you can't drop in an arbitrary NSE script or a bleeding-edge fork the moment it lands.
A decision framework
Answer these and the choice usually makes itself:
- How often do you scan? Daily/continuous at high volume → self-hosting's ~$0 marginal cost starts to win. Irregular/bursty → hosted.
- Do you produce reports for others (clients, auditors, execs)? Yes → hosted's built-in PDFs save real time.
- Do you need a static, allowlist-friendly source IP? Yes and you don't have one → hosted.
- Are you regulated/air-gapped such that data can't leave your network? Yes → self-hosted (or a private-deployment vendor).
- Do you have engineering time to maintain feeds and infra? No → hosted.
| Your situation | Lean | |----------------|------| | Occasional external assessments, need client reports | Hosted | | MSP/consultant with a changing client roster | Hosted (non-expiring credits) | | High-volume continuous scanning of your own perimeter, with an ops team | Self-hosted or per-target hosted | | Air-gapped / strict data residency | Self-hosted | | CI/CD security gate with an existing platform team | Self-hosted (containerized) |
The middle path
It's not all-or-nothing. Many teams self-host inside CI/CD for developer-facing checks (fast, data stays put) and use a hosted console for external, client-facing scans (static IP, polished reports). Use each where its trade-offs are cheapest.
How VulnScanners handles the hosted side
VulnScanners runs the exact open-source stack — Nmap, Nuclei, and OWASP ZAP — on our infrastructure, with a continuously-synced Nuclei template feed, a stable source IP for allowlisting, stored scan history, and a PDF report per scan. Pricing is credit-based with non-expiring credits, so irregular scanning doesn't get punished. For local development and one-offs, the open-source tools remain the right call — hosted earns its keep on recurring, client-facing work.