Tenable is the heavyweight in exposure management: Nessus as the scan engine, plus cloud, identity, OT and external attack surface in the Tenable One platform. monsys is deliberately narrower: servers, from monitoring to attested remediation and signed evidence, EU-hosted. Honest comparison below.
| Dimension | monsys.ai | Tenable |
|---|---|---|
| Target audience and onboarding | ✓EU SMB and mid-market: install the agent, data within minutes | ~Enterprise-first: powerful, but a rollout project with a dedicated security team |
| Platform breadth | ~Servers (Linux/Windows) plus AI observability, deliberately narrow | ✓VM, web app scanning, cloud (CNAPP), identity, OT/IoT and external ASM in one platform |
| In-host CVE detection | ✓App dependencies + OS packages + kernel (backport-aware), plus SBOM/VEX export | ✓Nessus engine: the industry reference in vulnerability scanning for years |
| Prioritisation | ✓Blast radius via your own network topology, internet-facing paths and capacity trends | ✓VPR scores and attack path analysis across the platform |
| Remediation | ✓Attested loop: operator approves with TOTP, rollback on failure, every step signed | ~Separate patch management module; no attestation chain over the fix itself |
| Evidence for auditors | ✓Ed25519-signed audit packs, verifiable offline without trusting us | ~Compliance dashboards and reports, not cryptographically signed |
| Monitoring, uptime and capacity | ✓Included: metrics, alerts, uptime checks, status pages, capacity prediction | ✗No operational monitoring, pure exposure management |
| Active attack detection | ✓Auth-log analysis, honeypots, GeoIP and lateral-movement correlation on the host | ~AD/identity attack detection in a separate module; no host runtime detection |
| Data residency and sovereignty | ✓EU: hosted in Belgium (GoTrust BV), no US SaaS in the critical path | ~US vendor; cloud platform with region choice, on-prem possible via Security Center |
| Price and entry threshold | ✓5 agents free forever, then €3 per server per month, public | ~VM from ±$3,700 per year at a 100-asset minimum; full Tenable One quote-only |
Tenable wins on raw scan breadth and depth: Nessus is the reference for good reasons, and Tenable One covers surfaces we deliberately do not touch (cloud config, OT, identity). We win on simplicity, price, EU sovereignty, attested remediation and signed evidence. Below roughly 100 servers without a dedicated security team, Tenable is often overkill; the 100-asset minimum speaks for itself. Above that, with your own SOC, Tenable is a logical choice and monsys can deliver the monitoring and the evidence chain alongside it.