If you are looking for a Tenable alternative because the renewal quote keeps growing, or because findings pile up faster than your team can fix them, start with what you can keep. Keep Nessus Professional or OpenVAS as your scanner. SITEY sits above it on your own Linux server: it pulls the findings in, triages them with AI, writes a fix for each affected host, holds that fix for approval, has an agent apply it and verifies the fix with a retest before anything is marked resolved. It has a flat published price, you buy it online and your own team installs it.
Keep your scanner, change what happens after the scan
Switching away from Tenable does not have to mean switching scanners. SITEY can launch scans directly on Nessus and OpenVAS, and it imports results from 16 scanner families, Tenable exports included. Everything lands in one queue. Repeated detections of the same finding by the same scanner update one record instead of piling up as new rows, and AI triage groups findings from different scanners that look like the same issue, so you can see the overlap before anyone is assigned.
Be precise about the split. Direct scan launch covers Nessus and OpenVAS only. For the other fourteen you run the scan in the tool itself and upload the export. Direct launch works through the scanner’s API, so if your Nessus edition does not allow scan control over its API, upload the Nessus export instead. The Nessus integration page explains both paths for Nessus users, and the OpenVAS integration page does the same for teams moving to an open-source scanner.
An on-prem Tenable Security Center alternative
Security Center (many admins still call it Tenable.sc) is the Tenable product this page compares against, because Tenable positions it as “managed on-prem”. It is licensed by annual subscription and priced by IP, and Tenable states that perpetual licensing is also available. The Tenable buy page lists no price for it: you request a customized quote.
SITEY is self-hosted software. You install it on your own Linux server (Ubuntu 22.04 or 24.04, Debian 12, RHEL or Rocky 9) and it stores everything in your own PostgreSQL database. There is no Windows server edition. The price is on our website, checkout is online, and there is no sales call between you and the download. If you are weighing a Tenable.sc alternative mainly because of how it is bought, this is the difference that matters most.
| SITEY | Tenable | |
|---|---|---|
| Where it runs | Your Linux server, your PostgreSQL database | Security Center: “managed on-prem” |
| Licensing model | Flat fee: $599 per month or $5,999 lifetime; each licence has an IP quota | Security Center: annual subscription priced by IP; perpetual licensing also available |
| Published price | Yes, on the pricing page | Security Center: no online price, customized quote |
| How you buy | Online checkout, self-install, no sales call | Security Center: customized quote request |
| Patching | Agents on Windows and Linux apply approved, host-specific scripts | Tenable Patch Management, a separate product with no online price: Windows, Mac, Linux, 20,000+ third-party apps |
| Change control | Approval gate: 4 autonomy levels, 18 risk-classified AI actions | Patch Management: patch policies with SLAs, controls for deployments, testing and approvals |
| Hosted option | None, self-hosted only | Patch Management: on-premises or SaaS |
You will notice we print no Tenable prices. Security Center is sold by quote, so the only honest comparison is your own quote against our published price.
Where Tenable is stronger
A fair comparison starts with the other side’s strengths. If one of these decides the purchase for you, Tenable is probably the better fit, and we would rather you know that now.
Nessus Professional and Nessus Expert are Tenable products, sold on Tenable’s own buy page. SITEY does not replace a scanner. It depends on one.
Tenable Patch Management covers Windows (drivers and BIOS included), Mac and Linux, with 20,000+ third-party applications and 250,000+ patches. SITEY agents cover Windows and Linux and ship no third-party application catalogue of that size.
Tenable describes “autonomous patching” governed by patch policies, with SLAs set by criticality and exploitability, and deployments you can schedule, pause or roll back.
Tenable offers perpetual licensing for Security Center next to the annual subscription. Our lifetime licence is also perpetual, but it includes one year of updates and engine feed.
Tenable Patch Management runs on-premises or as SaaS. SITEY has no hosted edition, so you always run the server yourself.
Security Center is priced by IP and Patch Management by asset. If you cover only a small number of addresses, a quote may come in below a flat licence. Get one before you decide.
What SITEY does differently
Many teams start looking for a Tenable alternative because of the gap between a finding and a fixed host. Tenable addresses part of that gap with Patch Management, which deploys vendor patches under policy. SITEY takes another route: it writes a fix for the specific host and finding, then carries that fix through approval and retest in one eight-phase pipeline.
- Discovery and scanning
Launch Nessus or OpenVAS scans from SITEY, or run any supported scanner yourself and bring the report.
- Collection and deduplication
Results from all 16 scanner families go into one queue. Repeat detections by the same scanner update the existing record, and AI triage groups likely duplicates across scanners.
- AI validation
Each finding gets a false-positive probability. The reasoning is stored, and an analyst can overturn the verdict.
- Risk scoring
A priority score built on CVSS, EPSS and the CISA KEV catalogue decides what goes first. See AI triage.
- Assignment
Findings go to a named owner instead of sitting in a shared export.
- AI remediation planning
The AI writes a bash or PowerShell script for the affected host, not a generic advisory. See AI remediation.
- Approval-gated patching
Four autonomy levels and 18 risk-classified AI actions decide what may proceed. High-impact changes wait for a person. The SITEY agent then applies the approved script and reports the result and inventory back. See approval gates.
- Retest and closure
A finding is resolved only after a retest. Nessus, Acunetix and Burp Suite findings are rescanned and the specific finding is matched; with OpenVAS the rescan is judged at scan level, not finding by finding. Findings from other sources fall back to agent-based verification, which checks for a completed remediation job on that exact host and leaves the finding open for a manual check when no agent can be resolved. See retest and closure.
A finding is not closed because a script returned zero. It is closed when the retest finds it gone.
The AI steps use an OpenAI-compatible endpoint of your choice with your own key. The finding text and host context go to that endpoint. You can point SITEY at a model endpoint you host yourself, or turn AI off.
What SITEY does not do
SITEY is not SaaS: you run the server, and installing and operating it needs a technical person comfortable with Linux, PostgreSQL and rolling out agents. Each licence has an IP quota, see the pricing page. SITEY is not air-gapped: your server connects to siteyvm.com for licence activation and validation and for the engine feed. AI features need your own API key, and that usage is billed by your AI provider, not included in our price.
A flat price instead of a quote
SITEY costs $599 per month, cancellable, or $5,999 for a lifetime licence that includes the first year of updates and engine feed. There is no per-asset fee and no scan quota, and each licence has an IP quota, listed on the pricing page. Because the monthly plan can be cancelled, you can run SITEY next to Security Center for a scan cycle and compare what each one closes before your renewal date. For the wider case for keeping the platform in your own building, read our guide to on-premise vulnerability management.
Who builds SITEY
SITEY is built by SITEY Bilisim at Giresun Teknopark in Bulancak, Turkey. Our founder has worked as a security researcher since 2014 and published CVE-2021-40960 and CVE-2022-3792. How we handle your data, and what crosses the network, is documented on our security page.
Frequently asked questions
Can I keep using Nessus if I switch to SITEY?
Yes. SITEY can launch scans directly on Nessus and OpenVAS through their APIs, and it imports results from 16 scanner families, Tenable exports included, so if your Nessus edition does not allow scan control over its API you upload the export instead. It does not replace your scanner; it works on the findings your scanner produces.
Is SITEY air-gapped? What leaves my network?
No, SITEY is not air-gapped. Your server makes two connections to siteyvm.com: licence activation and validation, and the engine feed. Neither carries scan data. Optional outbound calls go to the OpenAI-compatible AI endpoint you choose, which receives finding text and host context, and to NVD, CISA KEV, FIRST EPSS, MSRC and the Microsoft Update Catalog. You can use a self-hosted model endpoint or switch AI off.
Does SITEY replace Tenable Patch Management?
Not like for like. Tenable Patch Management covers Windows, Mac and Linux with 20,000+ third-party applications, on-premises or as SaaS. SITEY agents cover Windows and Linux, and SITEY writes host-specific scripts for findings rather than deploying from a large application catalogue. If broad application patching across Mac and Windows is your main need, Tenable is the closer fit.
Can I install the SITEY server on Windows?
No. The server runs only on Linux: Ubuntu 22.04 or 24.04, Debian 12, RHEL or Rocky 9, with your own PostgreSQL database. The agents run on both Windows and Linux endpoints.
Is there really no per-asset pricing?
There is no per-asset fee and no scan quota: $599 per month or $5,999 for a lifetime licence. Each licence does have an IP quota, which is listed on the pricing page. AI usage is billed separately by your AI provider.
Will SITEY change production systems without approval?
High-impact changes wait for a person. The approval gate combines four autonomy levels with 18 risk-classified AI actions, so you decide how much runs unattended, and a named approver releases the risky changes before an agent applies them.
Sources
- Tenable, Tenable Security Center product page: “managed on-prem”, annual subscription priced by IP, perpetual licensing available. https://www.tenable.com/products/security-center, accessed 24 September 2026.
- Tenable, buy page: Nessus Professional and Nessus Expert listed; Security Center by customized quote; Patch Management without an online price. https://www.tenable.com/buy, accessed 24 September 2026.
- Tenable, Tenable Patch Management product page: Windows (drivers and BIOS included), Mac, Linux, 20,000+ third-party applications, 250,000+ patches, “autonomous patching” under patch policies, SLAs by criticality and exploitability, scheduling, pausing and rollback, controls for deployments, testing and approvals, on-premises or SaaS, annual subscription priced by asset. https://www.tenable.com/products/patch-management, accessed 24 September 2026.
Tenable, Tenable Security Center and Nessus are trademarks of Tenable, Inc. SITEY is not affiliated with or endorsed by Tenable. Other product names are trademarks of their respective owners.