Compare the Top Free Software-Defined Perimeter (SDP) Software as of October 2025

What is Free Software-Defined Perimeter (SDP) Software?

Software-defined perimeter (SDP) solutions are a type of network security architecture that allows authentication across a network on a case by case basis. Software-defined perimeter solutions offer network security software tools that enable IT security teams to segment networks and authenticate users based on the user access and data they require in each specific case. Compare and read user reviews of the best Free Software-Defined Perimeter (SDP) software currently available using the table below. This list is updated regularly.

  • 1
    Fidelis Halo

    Fidelis Halo

    Fidelis Security

    Fidelis Halo is a unified, SaaS-based cloud security platform that automates cloud computing security controls and compliance across servers, containers, and IaaS in any public, private, hybrid, and multi-cloud environment. With over 20,000 pre-configured rules and more than 150 policy templates that cover standards such as PCI, CIS, HIPAA, SOC, and DISA STIGs for IaaS services, Halo’s extensive automation capabilities streamline and accelerate workflows between InfoSec and DevOps. The comprehensive, bi-directional Halo API, developer SDK, and toolkit automate your security and compliance controls into your DevOps toolchain to identify critical vulnerabilities so they can be remediated prior to production. The free edition of Halo Cloud Secure includes full access to the Halo Cloud Secure CSPM service for up to 10 cloud service accounts across any mix of AWS, Azure, and GCP, at no cost to you, ever. Sign up now and start your journey to fully automated cloud security!
    Starting Price: Free
  • 2
    InstaSafe

    InstaSafe

    InstaSafe Technologies

    InstaSafe is redefining the challenge of secure access to modern networks by leveraging Zero Trust principles with its security solutions, that ensure seamless access to cloud applications, SAP applications, on-premise data, IoT devices, and multiple other neoteric use cases. InstaSafe discards traditional VPN based conceptions of a network perimeter, instead moving the perimeter to the individual users and the devices they access. The Zero Trust approach followed by InstaSafe mandates a “never trust, always verify' approach to privileged access, without focusing on network locality. InstaSafe ZTAA relies on continuously assessing the trust and risk associated with every user, and the context of their access request, and simultaneously employs a system of comprehensive authentication before grnating least privilege access. By only making authorised applications accessible to the user, and not exposing the network to these users, ZTAA serves to negate the exploitable attacks surface
    Starting Price: $8/user/month
  • 3
    VNS3

    VNS3

    Cohesive Networks

    The all-in-one networking device promising connectivity, security and flexibility at a fraction of the cost. Launch a VNS3 image through a public cloud marketplace. We are available in AWS, Azure and GCP. Via private image sharing. We will gladly share a private image with your account. We can also provide a VDI/VDK file which you can import into your environment of choice, be that VMWare or a locked down cloud environment. The Cohesive Networks support team will provide you a license in minutes. Upgrading your VNS3 controller's license can be done via the VNS3 console or the API. The VNS3 Overlay Network is an optional feature that provides end-to-end encryption, increased performance (in most cloud environments), and IP address mobility across regions and cloud providers. An overlay network is layered over the native networking layers, but can be independent from all underlying hardware and software. The overlay is dependent on the native networking layers.
    Starting Price: $150 per month
  • 4
    Simply5 CloudLAN
    CloudLAN is a secure virtual office for a distributed teams. CloudLAN helps bring all the user computers into a single virtual network & accessible to each other through private IP's from anywhere. TeamVPN IP gives a roaming Static IP that is no longer tied to a physical locations internet connection. Addon features like service casting & Host connect makes remote work accessible to even companies without inhouse technical team.
    Starting Price: $19
  • 5
    Twingate

    Twingate

    Twingate

    The way we work has changed. People now work from anywhere, not just from an office. Applications are based in the cloud, not just on-premise. And the company network perimeter is now spread across the internet. Using a traditional, network-centric VPN for remote access is not only outdated and difficult to maintain, but exposes businesses to security breaches. VPN infrastructure is costly and time-consuming to procure, deploy, and maintain. Inability to secure access at the app level means hacks can expose whole networks. Twingate enables organizations to rapidly implement a modern Zero Trust network that is more secure and maintainable than VPNs. Delivered as a cloud-based service, Twingate empowers IT teams to easily configure a software-defined perimeter without changing infrastructure, and centrally manage user access to internal apps, whether they are on-prem or in the cloud.
    Starting Price: $10 per user per month
  • 6
    Tempered

    Tempered

    Tempered

    The network you want over the network you have. Fast and easy to deploy & maintain. No forklifts required. Protect critical assets and unpatchable IoT devices with a segmented virtual air gap. Securely connect any device or network across public, private, cloud, & mobile networks. Stop lateral movement from bringing your network down. Ditch internal firewalls and complex VLANs & ACLs. Replace expensive MPLS links with more cost efficient SDWAN capabilities. Simplify remote access for employees & vendors, hybrid cloud connectivity and multi-cloud transport, replace expensive MPLS network connections (SDWAN), isolate and protect critical process controls and devices, securely share device data with the cloud analytics, provide safe vendor access to sensitive industrial networks, segment networks for enhanced security and ransomware protection.
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