Cybersecurity · head to head
Falco vs Semperis
Falco
Cybersecurity
CNCF-graduated runtime threat detection for Linux and Kubernetes using eBPF
- From
- Free
- Rated
- -
Semperis
Cybersecurity
Identity threat detection and Active Directory forest recovery for AD, Entra ID and Okta, from a privately held US vendor.
- From
- On request
- 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.; Semperis scope is limited to Active Directory, Entra ID and Okta, so an organisation whose critical identity lives elsewhere gets little from it, and the recovery value declines in direct proportion to how much has already moved off on-premises AD.
- They diverge on capability: Falco covers eBPF kernel instrumentation, Semperis covers Active Directory Forest Recovery.
- Prices and features above were last checked on 31 August 2026.
Where they differ
Only the attributes on which Falco and Semperis 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 Semperis
- Active Directory Forest Recovery
- Malware-free restore
- Replication-stream monitoring
- Automated rollback
- Attack indicator scoring
- Entra ID and Okta coverage
- Purple Knight
- Forest Druid
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 Semperis
- A regulated business required to evidence host and container intrusion detection on Kubernetes nodes for an auditnot Semperis
- A security team wanting a vendor-neutral detection layer whose rules they can read and modify rather than a black-box agentnot Semperis
- A cluster where a compromised dependency might write to sensitive paths or open unexpected outbound connections, and only kernel-level visibility will catch itnot Semperis
Semperis
- An organisation that cannot answer an auditor or insurer asking how long it would take to rebuild Active Directory after a destructive attacknot Falco
- Post-incident recovery where domain controllers are compromised and restoring from system-state backup would reintroduce the attacker's footholdnot Falco
- Continuous detection of privileged group changes and directory-level tampering that domain controller security logs missnot Falco
- Hybrid estates where AD, Entra ID and Okta all matter and no single tool currently shows changes across the threenot 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.
Semperis
- Scope is limited to Active Directory, Entra ID and Okta, so an organisation whose critical identity lives elsewhere gets little from it, and the recovery value declines in direct proportion to how much has already moved off on-premises AD.
- The licence buys tooling, not a proven runbook: forest recovery is only worth what your last rehearsal demonstrated, and a plan that has never been executed end to end in a lab is an untested assumption regardless of what was purchased.
- It overlaps with backup and directory management products from Quest, Veeam, Commvault and others, so the buyer must argue internally why a dedicated product is needed alongside a backup contract that already claims to protect Active Directory.
- Running Directory Services Protector well requires someone who understands AD internals, replication metadata and Tier 0 attack paths, and without that person the alerts on privileged changes are either ignored or auto-reverted in ways that break legitimate administration.
- Licensing is driven by identity object counts, so directories carrying years of stale user accounts and service principals pay for objects that should have been deleted, and the cleanup project that would reduce the bill is the one nobody has time for.
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
Semperis
On requestNo published plan breakdown. See the Semperis review.
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 Semperis if
- You need active directory forest recovery.
- You also want malware-free restore.
Questions people ask
- Is Falco or Semperis better?
- Neither clearly leads. Falco starts at Free and Semperis at On request, and user ratings are close enough to be indistinguishable. Choose on capability and platform support.
- Which is cheaper, Falco or Semperis?
- Falco has a free tier; the other does not. Paid plans start at Free for Falco and On request for Semperis.
- Does Falco or Semperis run on more platforms?
- Falco runs on Linux, Kubernetes, Self-hosted. Semperis runs on Web.
- Can I use Falco for free?
- Yes. Falco has a free tier, so you can try it without paying. Semperis starts at On request.
- 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 Semperis is typically brought in for.
- What can Falco do that Semperis cannot?
- Falco covers eBPF kernel instrumentation, System call rules engine, Container and Kubernetes context, Default rule set. Semperis covers Active Directory Forest Recovery, Malware-free restore, Replication-stream monitoring, Automated rollback.
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.
Semperis: Does this replace my backups?
No. It replaces the Active Directory recovery procedure specifically. You still need backups for everything else, and the point of Semperis is that a generic system-state backup of a domain controller is a poor way to recover a forest because it restores the operating system along with whatever compromised it.
Falco: 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.
Semperis: Is it useful if we are cloud-only on Entra ID?
Partly. Directory Services Protector covers Entra ID and Okta for change tracking and posture, but the forest recovery product, which is the strongest reason to buy, applies to on-premises Active Directory. A genuinely cloud-only organisation should weigh it against Microsoft's own tooling.
Falco: 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.
Semperis: Are Purple Knight and Forest Druid really free?
Yes, both are free downloads with no licence requirement, and they are widely used by organisations that are not Semperis customers. They are also, transparently, the top of the sales funnel.
Falco: 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.
Semperis: How long does forest recovery actually take?
The honest answer is whatever your rehearsal took. The vendor's case is hours instead of days, and automation genuinely removes most manual steps, but the number that matters for your board is the one from a test in your own environment.
Semperis: Does it require agents on domain controllers?
It collects directory changes from the AD replication stream, which is what lets it see changes that bypass the security log. Deployment details vary by product and version, so confirm the exact architecture against your domain controller change-control rules.
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