Intruder
Cloud vulnerability scanner for external infrastructure, web apps and cloud accounts, with a free plan.
Updated · AppBreakup editorial · Web
Is Intruder free?
Free plan, plus paid plans
- Free plan:
- Yes
Checked on Intruder's site Nov 8, 2026
Switch from Intruder to
All 6
Tenable NessusEssentials Plus price: $199/year
QualysFree plan + paid
DetectifyStarting price: From €2,500 per year (Standard)
- Verified facts
- 6 of 6
- Alternatives ranked
- 6
- Approved reviews
- 0
- Visits sent from here
- 0
About Intruder
Intruder is a cloud-based vulnerability scanner aimed at small and mid-sized companies without a dedicated security team. It scans internet-facing servers, websites, APIs, container images and cloud accounts on a schedule, runs extra checks when new threats appear, and turns results into a prioritised list with a cyber hygiene score that is easy to share with auditors or customers. Under the hood it combines engines including Nuclei, OpenVAS and Tenable, with its own checks on top. Higher plans add authenticated web app testing, agents for internal servers and laptops, more cloud accounts and attack surface discovery, and Intruder also sells AI-assisted web application pentests. Pricing is a base fee plus a per-target licence, billed monthly or yearly, and there is a limited free plan and a 14-day trial of the Cloud plan. Its reports are popular for SOC 2 and ISO 27001 evidence. Large enterprises with deep internal networks may find it lighter than Qualys or Tenable.
Best for: Small and mid-sized companies that need easy external and cloud scanning for compliance.
Intruder pricing (checked Nov 8, 2026)
Each line is quoted from Intruder's own site, with the page it came from.
| Plan or term | What it says | Checked | Source |
|---|---|---|---|
| Free plan | Yes | Nov 8, 2026 | intruder.io |
| Free trial | 14 days | Nov 8, 2026 | intruder.io |
| AI pentests | From $3,500 per test | Nov 8, 2026 | intruder.io |
| AI pentest | From $3,500 per test | Nov 8, 2026 | intruder.io |
Pros and cons
What works
- Free plan and 14-day trial with no sales call
- Combines several scanning engines with its own checks
- Clear reports suited to SOC 2 and ISO 27001 evidence
- Monthly or annual billing
Why people leave
- Internal network scanning only on Pro and Enterprise plans
- Per-target licences add up for large estates
- Lighter on internal enterprise networks than Qualys or Tenable
Intruder vs Tenable Nessus, Qualys and Detectify
From each app's listing and the prices verified on its own site. A dash means we haven't verified it yet.
| Attribute | Intruder | Tenable Nessus | Qualys | Detectify |
|---|---|---|---|---|
| Pricing | Free plan + paid | Paid | Free plan + paid | Paid |
| Verified price | — | $199/year | — | From €2,500 per year (Standard) |
| Free plan | Yes | Yes (Nessus Essentials) | Community Edition | Yes, Starter from €0, up to 5 users |
| Open source | No | No | No | No |
| Self-hostable | No | Yes | No | No |
| Platforms | Web | Windows, macOS, Linux, Web | Web | Web |
Top Intruder alternatives
See all 6- 1Tenable Nessus68.8
The scanner Intruder partly builds on, if you want to run and tune it directly.
- 2Qualys64.8
Deeper enterprise coverage and built-in patching, with a free Community Edition.
- 3Detectify61.8
Stronger on web apps and attack surface, using tests sourced from ethical hackers.
- 4
Rapid757.5Full vulnerability management plus MDR for larger teams.
- 5
Acunetix55.9Dedicated web application scanner with deep crawling of single-page apps, if web apps are your main attack surface.
Why people left Intruder
In reviewers' own words, from reviews of the apps they moved to. These are their opinions, not ours.
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Reviews
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Intruder: common questions
What is Intruder?
Intruder: Cloud vulnerability scanner for external infrastructure, web apps and cloud accounts, with a free plan. Best for small and mid-sized companies that need easy external and cloud scanning for compliance. Available for Web.
Is Intruder free?
Intruder has a free plan and paid plans. Free plan: Yes (checked on Intruder's own site).
How much does Intruder cost?
Intruder is free with paid plans. Free plan: Yes; Free trial: 14 days; AI pentests: From $3,500 per test; AI pentest: From $3,500 per test. Checked on Intruder's own site, November 2026.
Does Intruder have a free trial or refund?
Free trial: 14 days. Source: Intruder's own site.
Is Intruder open source?
No, Intruder is not open source.
What platforms does Intruder run on?
Intruder is available for Web.
What are the best alternatives to Intruder?
The highest-ranked Intruder alternatives right now are Tenable Nessus, Qualys and Detectify. See the full ranked list for pricing, platforms and verified facts.
Intruder vs Tenable Nessus: what's the difference?
Intruder is free with paid plans; Tenable Nessus is a paid product. Only Tenable Nessus runs on Windows, macOS and Linux.