Cybersecurity · head to head
Falco vs Nessus
Falco
Cybersecurity
CNCF-graduated runtime threat detection for Linux and Kubernetes using eBPF
- From
- Free
- Rated
- -
Nessus
Cybersecurity
The most trusted vulnerability assessment solution
- From
- $4790/year
- Rated
- -
The short version
- Only Falco has a free tier, so it costs nothing to try first.
- Each has a real cost: Falco falco detects and alerts but does not block; stopping an attack requires wiring up Falco Talon or your own response tooling, so out of the box a confirmed detection still means a human intervening after the fact.; Nessus nessus Professional is $4,790 for one year, with no free or low cost commercial tier
- They diverge on capability: Falco covers eBPF kernel instrumentation, Nessus covers Vulnerability scanning.
- Prices and features above were last checked on 31 August 2026.
Where they differ
Only the attributes on which Falco and Nessus actually diverge.
Identical on both: user rating (Not yet rated), category (Cybersecurity).
What each one covers
Drawn from each product's published feature list. An absence here means we hold no record of it - not that the product lacks it.
Only in Falco
- eBPF kernel instrumentation
- System call rules engine
- Container and Kubernetes context
- Default rule set
- Falcosidekick
- Falco Talon
- Plugins framework
- DaemonSet deployment
Only in Nessus
- Vulnerability scanning
- Configuration auditing
- Malware detection
- Web application scanning
- Cloud scanning
- Compliance checks
- Patch auditing
- Pre-built policies
What people use each for
The jobs each tool is most often brought in to do.
Falco
- A platform team that needs to know when a shell is opened inside a production container, which image scanning cannot detect because it happens at runtimenot Nessus
- A regulated business required to evidence host and container intrusion detection on Kubernetes nodes for an auditnot Nessus
- A security team wanting a vendor-neutral detection layer whose rules they can read and modify rather than a black-box agentnot Nessus
- A cluster where a compromised dependency might write to sensitive paths or open unexpected outbound connections, and only kernel-level visibility will catch itnot Nessus
Nessus
- Vulnerability scanning for individual practitionersnot Falco
- Enterprise vulnerability managementnot Falco
- Web application security assessmentsnot Falco
Where each one falls short
Documented limitations, not opinions. Every one is a constraint you would hit in normal use.
Falco
- Falco detects and alerts but does not block; stopping an attack requires wiring up Falco Talon or your own response tooling, so out of the box a confirmed detection still means a human intervening after the fact.
- The default rule set is noisy in real clusters and generates a large volume of benign matches from normal operational activity; without weeks of tuning, alert fatigue sets in and the team stops reading the feed, which is the usual failure mode.
- There is no storage, console, search or case management in the project, so a working detection capability means also running Falcosidekick, an event store, a dashboard and alert routing, all of which you build, host and maintain.
- The modern eBPF driver requires kernel 5.8 or later; older hosts fall back to the legacy probe or the kernel module, which brings driver-building against kernel headers and the operational fragility that comes with it on every kernel upgrade.
- Per-node syscall instrumentation carries measurable CPU overhead on busy hosts, and the cost scales with syscall volume rather than with cluster size, so the noisiest and most performance-sensitive workloads are exactly the ones that feel it most.
Nessus
- Nessus Professional is $4,790 for one year, with no free or low cost commercial tier
- Multi year terms are the only discount route, at $9,330.95 for two years and $13,637.54 for three
- It is a single user scanner, so team workflows mean migrating to another Tenable product
- Tenable One vulnerability management is priced separately, starting at $3,500 a year for 100 assets
Pricing, plan by plan
Falco
Free- Falco (open source)Free
- Apache 2.0 licence, CNCF graduated project
- eBPF and kernel module drivers
- Full rules engine and default rule set
Nessus
$4790/year- Nessus Professional$4790/year
- 1 year license
- Best for individual security professionals
- Nessus Professional 2-Year$9330.95/2 years
- 2 year license with discounted rate vs. annual
- Nessus Professional 3-Year$13637.54/3 years
- 3 year license with discounted rate vs. annual
- Nessus Expert$6790/year
- 1 year license
- Enhanced capabilities vs. Professional
Which should you pick?
Choose Falco if
- You need ebpf kernel instrumentation.
- You want to start without paying.
- You work on Linux, Kubernetes, Self-hosted.
- You also want system call rules engine.
Choose Nessus if
- You need vulnerability scanning.
- You work on Desktop, Api.
- You also want configuration auditing.
Questions people ask
- Is Falco or Nessus better?
- Neither clearly leads. Falco starts at Free and Nessus at $4790/year, and user ratings are close enough to be indistinguishable. Choose on capability and platform support.
- Which is cheaper, Falco or Nessus?
- Falco has a free tier; the other does not. Paid plans start at Free for Falco and $4790/year for Nessus.
- Does Falco or Nessus run on more platforms?
- Falco runs on Linux, Kubernetes, Self-hosted. Nessus runs on Desktop, Api.
- Can I use Falco for free?
- Yes. Falco has a free tier, so you can try it without paying. Nessus starts at $4790/year.
- What is Falco best used for?
- Falco is most often used for a platform team that needs to know when a shell is opened inside a production container, which image scanning cannot detect because it happens at runtime, a regulated business required to evidence host and container intrusion detection on kubernetes nodes for an audit, a security team wanting a vendor-neutral detection layer whose rules they can read and modify rather than a black-box agent, a cluster where a compromised dependency might write to sensitive paths or open unexpected outbound connections, and only kernel-level visibility will catch it. Of those, a platform team that needs to know when a shell is opened inside a production container, which image scanning cannot detect because it happens at runtime and a regulated business required to evidence host and container intrusion detection on kubernetes nodes for an audit are not what Nessus is typically brought in for.
- What can Falco do that Nessus cannot?
- Falco covers eBPF kernel instrumentation, System call rules engine, Container and Kubernetes context, Default rule set. Nessus covers Vulnerability scanning, Configuration auditing, Malware detection, Web application scanning.
Answered from the vendors’ own pages
Falco: Does Falco block attacks?
No. It detects and emits events. Response requires Falco Talon or your own automation on top.
Nessus: What is the cheapest Nessus option?
Nessus Professional starts at $4,790 per year for a 1-year license. Multi-year commitments offer discounts, with 2-year licenses at $9,330.95 and 3-year licenses at $13,637.54.
SourceFalco: Is Falco owned by Sysdig?
Sysdig created and open sourced it, but it graduated within the CNCF in February 2024, so governance sits with the foundation rather than the vendor.
Nessus: What is the difference between Nessus Professional and Expert?
Nessus Expert costs $6,790 per year for a 1-year license (compared to $4,790 for Professional) and includes enhanced capabilities. Multi-year rates are available at discounted prices.
SourceFalco: What does it cost?
The project is Apache 2.0 with no licence fee. The cost is the storage, routing, tuning and staff time needed to make its output useful.
Nessus: Does Nessus offer optional support or training?
Yes, Nessus offers add-on services: Advanced Support at $400/year provides 24x365 access to phone, email, community, and chat support. On-Demand Training costs $275/year for Fundamentals course access or $385/year for both Fundamentals and Advanced courses.
SourceFalco: What kernel version do I need?
Kernel 5.8 or later for the default modern eBPF driver. Older hosts need the legacy eBPF probe or the kernel module.
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- Nessus vs Rapid7 InsightVM
- Nessus vs Omada Identity
- Nessus vs Jumio
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