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How OnScanner compares
Honest, source-linked comparisons. Every competitor fact is verified against their public product pages, with the retrieval date on every page. Most of these tools are excellent at their job; the comparison is about which job you need done.
Free plan, no sales call. Most scans finish in minutes.
OnScanner vs Tenable Nessus
The classic credentialed vulnerability scanner vs the attacker's outside-in view. Spoiler: most teams that own infrastructure benefit from both.
Read the comparison →OnScanner vs Burp Suite (Professional & DAST)
A hands-on web pentesting toolkit vs continuous, fully automated external scanning. Different jobs; honest comparison.
Read the comparison →OnScanner vs Detectify
The closest comparison in this list: both scan outside-in. The difference is what each pass covers.
Read the comparison →OnScanner vs Intruder
Two external scanners with different coverage mixes. Source-linked, verified comparison.
Read the comparison →OnScanner vs Pentest-Tools.com
A toolbox of individual scanners vs one consolidated live pass. Verified comparison.
Read the comparison →OnScanner vs Qualys Web Application Scanning (WAS)
A platform-suite DAST vs self-serve live scanning. Honest look at which fits your team.
Read the comparison →Looking for a specific alternative?
How to choose a web vulnerability scanner
Most scanner comparisons collapse once you name the job. A credentialed vulnerability manager, a manual pentesting toolkit, and an outside-in web scanner are three different products that happen to share a category page. Before comparing features, decide which questions you need answered:
Two practical filters cut the list fast. First, freshness: some products rescan on their own schedule and show you cached results, others scan live when you ask. Second, automation surface: if you want CI pipelines or AI agents running scans, check for a real REST API and an MCP server on the plan you would actually buy, not just on the enterprise tier. Every comparison on this page scores the vendor on both.
- What can an attacker see from outside? That is external, unauthenticated scanning: exposed services, vulnerable software versions, missing security headers, weak TLS, email spoofing posture. This is OnScanner's home ground.
- What is unpatched on machines I own? That is credentialed, inside-out vulnerability management, the territory of tools like Nessus and Qualys. It needs agents or credentials and complements the external view rather than replacing it.
- Can a skilled human break this specific app? That is manual pentesting with a toolkit like Burp Suite: deeper on one target, but hours of expert time per pass instead of minutes of automation.
- What are we doing to visitors' privacy? Trackers, fingerprinting, consent behavior, and whether a Reject all click or a Global Privacy Control signal is honored. Few security scanners cover it at all; OnScanner runs 40+ privacy checks in the same pass.
- Did this release make anything worse? That is a regression gate: scan the preview, compare it with production, and get a pass, regressed or inconclusive verdict before you ship. OnScanner exposes it through its REST API and MCP server.
How these pages are built
We only state a competitor capability when their own public pages describe it, and we link every source. "Not listed" means exactly that: not described on their public docs at the verification date. Spot an error? Email support@onscanner.com and we will fix it.
See what OnScanner finds on your site
Free plan, no sales call. Most scans finish in minutes.