Best Forescout Alternatives: 2026 Guide
Updated November 3, 2026. Asimily publishes this guide and is one of the platforms compared.
The top Forescout alternatives for 2026 are Armis, Aruba ClearPass, Asimily, Cisco ISE, Claroty, Elisity, Nozomi Networks, and Ordr. Cisco ISE and Aruba ClearPass replace Forescout’s network access control role. Asimily fits teams that want exploitability-based prioritization and segmentation policy created and simulated for the NAC they already run, while Claroty and Nozomi Networks fit OT-heavy sites and Armis fits ServiceNow-centric teams.
If your Forescout contract is coming up for renewal, you are evaluating your security posture in a market undergoing rapid consolidation. In 2026 alone, three major competitors were acquired or agreed to terms: Mitsubishi Electric bought Nozomi Networks, ServiceNow acquired Armis, and IonQ agreed to acquire Elisity. For security leaders, this wave of consolidation makes a renewal the ideal window to ensure your platform, vendor roadmap, and support model still align with your operational needs, starting with complete asset visibility, accurate exploitability analysis, and a clear path to risk reduction across IoT, OT, IoMT, and IT environments.
This guide covers what to evaluate in a Forescout alternative, compares the platforms security teams most often shortlist, and explains where Asimily fits for teams that need to close exposures without disrupting operations.
In this guide, you’ll find:
- What the 2026 acquisitions of Nozomi Networks, Armis, and Elisity mean for teams planning a Forescout renewal
- Why security teams evaluate Forescout alternatives beyond market changes
- Eight key criteria for evaluating connected device security platforms, including pricing
- A side-by-side comparison of the top eight Forescout alternatives for 2026
- How Asimily moves teams from risk intelligence to enforced, continuously maintained policy
- Frequently asked questions regarding Forescout alternatives and device security
- What to test before signing with a new vendor
Why Forescout Customers Are Weighing Their Options
Forescout itself has not changed hands in 2026, but its market has seen its share of change. Forescout has been privately owned by Advent International since 2020 (Ropes & Gray) and announced FedRAMP High authorization for its Vistaro cloud services in March 2026 (Forescout). Mitsubishi Electric completed its acquisition of Nozomi Networks on January 28, 2026 (Business Wire). ServiceNow completed its acquisition of Armis on April 20, 2026 (Verdict). IonQ announced on October 12, 2026 that it agreed to acquire Elisity, with closing expected in the fourth quarter (IonQ).
For organizations already standardized on Forescout, those changes may matter little. For others, a renewal is a reasonable time to ask a few practical questions:
- How will packaging and pricing change as Nozomi Networks, Armis, and Elisity move into larger portfolios?
- Does the platform you shortlist now depend on running its new parent’s other products?
- Where does connected device security, especially OT and medical device coverage, sit on each vendor’s roadmap?
- Where will investment dollars flow within the new parent companies, toward or away from these platforms?
They are the same questions any team should ask when a core security vendor, or its market, changes ownership, and they are easier to answer with a comparison already in hand.
Why Teams Evaluate Forescout Alternatives
Beyond market changes, security teams actively evaluate alternatives to Forescout for several practical product and operational reasons:
- High remediation volume: The Forescout Vistaro platform scores each device on configuration, function, and behavior, including CISA Known Exploited Vulnerabilities and EPSS data (Forescout), but its public documentation does not describe analysis of whether each vulnerability is exploitable in the customer’s own network.
- Enforcement limitations: Forescout enforces as the NAC itself, assigning VLANs and applying ACLs (Forescout). Teams that already run Cisco ISE or Aruba ClearPass, and want policy applied there, compare platforms that create and simulate policy for the NAC they own.
- Mitigation beyond segmentation: Forescout’s public documentation does not describe IoT patching, device configuration snapshots for recovery, or simulating how a fix would change a device’s risk before acting.
What to Evaluate in a Forescout Alternative
When evaluating connected device security platforms, eight key criteria help security leaders distinguish capabilities during vendor selection.
| Criterion | Why It Matters |
|---|---|
| Deployment Model | Many IoT, OT, and medical devices cannot run agents or tolerate aggressive scanning. Confirm the platform builds a complete inventory agentlessly, safely, and without disruption. |
| Exploitability Analysis | Generic CVSS scoring produces lengthy lists. More than 48,000 CVEs were published in 2025 alone (2025 CVE Data Review). Does the platform analyze actual network context to determine which vulnerabilities are genuinely exploitable on a specific device? |
| Path to Enforcement | A recommendation is not a control. Check whether the platform creates, simulates, applies, and maintains policy, and through which enforcement points: NAC, firewall, or natively. |
| Native Access Control | Network access control is Forescout’s core strength: it assigns VLANs and applies ACLs itself. If you want one platform to be both your device security tool and your NAC, confirm each alternative’s enforcement model; most, including Asimily, work through a NAC or firewall you already run. |
| Mitigation Beyond Segmentation | Some devices can be patched, some can only be reconfigured, and some can only be contained. Look for patching, configuration drift control, and targeted mitigations alongside segmentation. |
| Fit With Your Existing Stack | The platform should work with the NAC you already own, such as Cisco, Aruba, Arista, or Extreme, along with your firewalls, SIEM, and ITSM tools. |
| Vendor Strategy and Focus | Is connected device security the core focus of the vendor’s roadmap, or a secondary module within a broader IT suite? |
| Pricing Transparency and Model | How is licensing structured (e.g., per-device count vs. site licenses), and are quotes predictable as device counts grow? Ask whether capabilities such as segmentation, OT visibility, and each integration are licensed as separate modules. |
Top Forescout Alternatives for 2026
The table below compares approach, best fit, and notable strength across the platforms security teams evaluate most often, starting with Asimily.
| Platform | Best For | Approach | Notable Strength |
|---|---|---|---|
| Asimily | Organizations across IoT, OT, IoMT, and IT that need a comprehensive inventory that leads to enforced policy and reduces risk via multiple methods, including microsegmentation. | Agentless; cloud or on-premises; enforces through existing NACs and firewalls | ATT&CK Analysis (based on MITRE) that determines real exploitability per device, plus native packet capture. Top score in KLAS’s 2026 Healthcare IoT Security report (96.6; TechTarget); 4.9/5 on Gartner Peer Insights. |
| Armis | Organizations standardized on ServiceNow that want device findings in IT remediation workflows; part of ServiceNow since April 2026 | Agentless asset intelligence with ticket-based remediation | Exposure management across devices, cloud, code, and applications |
| Claroty | Industrial and critical infrastructure cyber-physical environments | Agentless, cloud/on-prem | Industrial protocol depth, threat detection, and secure remote access for OT |
| Ordr | Teams that put microsegmentation ahead of patching and targeted remediation, and prioritize AI-assisted segmentation workflows | Agentless, segmentation-first approach | AI-generated segmentation policy with natural-language orchestration through Ordr IQ |
| Nozomi Networks | OT, industrial, and critical infrastructure environments | Agentless hardware/virtual appliances with cloud management; part of Mitsubishi Electric since January 2026 | Deep OT protocol support, continuous threat monitoring, and scalable sensor architecture |
| Cisco ISE | Cisco-standardized networks that want network access control from their network vendor | On-premises or virtual NAC, with Cisco Access Manager as a cloud service for Meraki networks | Identity-based access control and segmentation across Cisco switching and wireless [NEEDS TECHNICAL CHECK] |
| Aruba ClearPass | Aruba-based networks that want network access control from their network vendor; part of HPE Networking | Policy manager for wired, wireless, and VPN access [NEEDS TECHNICAL CHECK] | Role-based access control across wired and wireless networks [NEEDS TECHNICAL CHECK] |
| Elisity | Teams that have a good inventory source and want identity-based microsegmentation on supported switches; IonQ agreed in October 2026 to acquire Elisity | Cloud-managed, with Virtual Edge software on supported switches or a hypervisor | IdentityGraph context from identity and security tools, with policy simulated before enforcement |
Forescout combines network access control with device visibility, so replacing it can mean replacing both roles. Teams can pair a NAC such as Cisco ISE, Aruba ClearPass, or FortiNAC with a device security platform such as Asimily, which creates and simulates segmentation policy for that NAC.
Asimily’s Approach: From Risk Intelligence to Enforced Policy
For teams moving off Forescout’s built-in NAC, the key difference is that Asimily works through the NAC you choose. Asimily is the Proactive Cyber Asset Defense Platform for IoT, OT, IoMT, and IT. It builds an agentless, continuously updated inventory of every connected asset safely without operational disruption. It deploys in the cloud or on premises and enforces segmentation through the NACs and firewalls a team already runs. Using patent-based ATT&CK Analysis, Asimily focuses teams on the riskiest 1% of devices by evaluating specific network topology and real-world exploitability.
From there, Asimily closes exposures (or recommends closures) with the right technique for each device: segmentation, patching, or a targeted mitigation drawn from Asimily Labs’ work. More practically, Risk Simulator models the risk reduction of an action before a team commits to the time and effort needed. For segmentation, Asimily recommends, creates, simulates, and enforces policy through NACs such as Extreme, Cisco ISE, Aruba ClearPass, and Arista. Policies stay matched to intent rather than relying on static ACLs that quickly go stale. Teams that keep Forescout can also run Asimily beside it: Asimily pulls Forescout’s device inventory and can push risk attributes into Forescout through its Data Exchange (DEX) module.
| Capability | What It Does |
|---|---|
| Inventory and Visibility | Agentless discovery and classification of every IoT, OT, IoMT, and IT asset, including services, connections, and firmware versions (for relevant devices). |
| ATT&CK Analysis | Determines real exploitability per device and network, producing the smallest remediation list for the same risk reduction |
| Policy Auto-Recommendation and Policy Creation | Shows where to start and generates policy in each NAC’s native format |
| Policy Simulation | Validates a policy against real, observed network traffic and shows exactly which devices and connections would be affected before anything deploys |
| Continuous Segmentation and Policy Audit | Keeps policy aligned as devices are patched, moved, added, or decommissioned, and merges, deduplicates, and optimizes policies to prevent sprawl and overtaxing of limited switch memory |
| IoT Patching | Applies fixes where devices can be patched, manually or automatically. |
| Configuration Control | Detects configuration drift and restores from known, valid snapshots. |
| Threat and Response | Anomaly detection with protective actions up to quarantine, plus native packet capture for forensic incident response |
| Governance, Risk, and Compliance | Compliance mapping to frameworks including NIST, CIS, NIS2, and CMMC, with an auditable record of enforcement for audits and board reviews |
Additionally, Asimily won the Operational Technology and Industrial IoT Security category in the 2026 Merit Awards.
Frequently Asked Questions
What Are the Top Forescout Alternatives for 2026?
The leading alternatives to Forescout include Armis, Aruba ClearPass, Asimily, Cisco ISE, Claroty, Elisity, Nozomi Networks, and Ordr. They fall into two groups: network access control platforms from network vendors (Cisco ISE and Aruba ClearPass), which replace Forescout’s NAC role, and connected device security and segmentation platforms (Armis, Asimily, Claroty, Elisity, Nozomi Networks, and Ordr), which replace or extend its device visibility and segmentation.
How Did Forescout’s Competitors Change in 2026?
Three of Forescout’s competitors changed ownership or agreed to in 2026: Mitsubishi Electric completed its acquisition of Nozomi Networks in January, ServiceNow completed its acquisition of Armis in April, and IonQ agreed in October to acquire Elisity. Forescout itself did not change ownership. Teams reviewing Forescout are weighing how those new owners may shape each platform’s roadmap and packaging.
Why Do Security Teams Replace Forescout?
Teams often consider alternatives when they need vulnerability prioritization based on exploitability in their own environment, segmentation policy created and simulated for the Cisco ISE or Aruba ClearPass deployment they already run, or remediation beyond segmentation, such as IoT patching and configuration snapshots.
Do Forescout Alternatives Require Software Agents?
No. Leading alternatives, including Asimily, can discover connected devices without installing endpoint agents, using passive network traffic analysis, native switch integrations, and API integrations to identify and secure devices without risking device disruption.
Can Cisco ISE Replace Forescout?
Cisco ISE can replace Forescout’s network access control role, since both apply access policy at the switch. Forescout also provides device discovery, classification, and risk scoring, so teams moving to ISE often add a device security platform for IoT, OT, and IoMT devices. Asimily integrates with Cisco ISE, creates DACL and SGACL policy for it, and simulates DACL policy against observed traffic before enforcement.
How Does Asimily Compare With Forescout?
Asimily and Forescout both discover IoT, OT, IoMT, and IT devices without agents. Forescout is also a NAC that enforces at the switch, which Asimily is not. Asimily adds per-device exploitability analysis, policy simulated for the NAC you already run, IoT patching, and configuration snapshots, and it integrates with Forescout for teams that keep it. See the Forescout vs Asimily: 2026 Comparison.
Choosing the Right Forescout Alternative
Consider your networking strategy overall to start. Do you want control over your switching resources from your hardware vendor, a cross-vendor platform provider, or directly own this responsibility? That determines if you are going to lean towards NAC enforcement or not.
After that, start with your riskiest devices, not a vendor’s feature list. Ask each finalist to show which devices in your environment carry exploitable risk, why each one is ranked where it is, and what it would take to contain them. Ask how they determined that a vulnerability is exploitable: from a generic score, or from analysis of your own network topology? Are they using comprehensive inventory records? Does each record have the detail (such as firmware level) to determine which vulnerabilities are present and concerning?
Then test the path to enforcement. Ask each finalist to show the impact of a proposed policy against your observed traffic before anything changes, using your own NAC, and to explain how that policy stays current as devices move and change. Your IT, OT, and facilities colleagues will want that answer before they agree to any enforcement.
See How Asimily Compares in Your Environment
Further Reading
[Related: IoT Security FAQ: Securing, Prioritizing, and Mitigating Risk Across Enterprise IoT Devices]
[Related: OT Security FAQ: Visibility, Vulnerability Management, and Operational Protection Without Downtime]
[Related: Microsegmentation FAQ: Tools, Zero Trust, and Segmenting IoT and OT Devices Without Disruption]
[Related: Forescout vs Asimily: 2026 Comparison]
[Related: Best Armis Alternatives: 2026 Guide]
[Related: Best Claroty Alternatives: 2026 Guide]
[Related: Best Elisity Alternatives: 2026 Guide]
[Related: Best Ordr Alternatives: 2026 Guide]
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