Top 10 Zero Trust Network Access Software in the United Kingdom for 2026

Zscaler is the SASE / SSE category leader, public on NASDAQ:ZS since 2018, founded 2007 by Jay Chaudhry (still CEO). The product portfolio (Zscaler Internet Access / ZIA, Zscaler Private Access / ZPA, Zscaler Digital Experience / ZDX) covers the full SSE stack: secure web gateway, ZTNA, CASB, DLP, and digital-experience monitoring. Best fit for global enterprises (5,000+ employees) requiring proven hyperscale, FedRAMP High authorization, and deep direct-to-cloud architecture. The company reported ~$2.2B revenue FY24 with strong growth, and maintains a 150+ data-center global footprint. Trade-offs: pricing has escalated meaningfully at renewal (10-20% increases consistently reported), enterprise-only sales motion makes mid-market procurement painful, and the April 2024 alleged-stolen-credentials investigation (Zscaler concluded no breach occurred but the disclosure cycle dented trust briefly) is still cited by some buyers. The product is also feature-dense to the point of complexity; junior teams routinely underuse what they paid for.

Cloudflare One is the SSE / SASE platform built on Cloudflare's 320+ POP global edge network, public on NYSE:NET since 2019. The portfolio includes ZTNA (Access), SWG (Gateway), CASB, DLP, browser isolation, and email security (acquired Area 1 Security 2022). Best fit for organizations valuing edge-network performance, transparent pricing, and developer-friendly deployment. The company's November 2023 disclosure that an Okta-token-related breach attempt occurred (and was contained without customer impact) is a positive vendor-trust signal; the transparency in that disclosure exceeded industry norms. Trade-offs: enterprise feature depth is still narrower than Zscaler or Netskope in some pillars (DLP and CASB depth in particular), the platform's rapid feature expansion creates UX inconsistency across modules, and FedRAMP Moderate authorization (vs Zscaler's High) is the procurement gate for some federal buyers.

Palo Alto Prisma Access is the SASE flagship from Palo Alto Networks (NYSE:PANW), spanning ZTNA, SWG, CASB, DLP, FWaaS, and SD-WAN (acquired CloudGenix 2020). Best fit for Palo Alto-consolidating enterprises that already run Palo Alto NGFWs (PA-Series), Cortex XDR, or Prisma Cloud (CSPM/CNAPP) and want to extend the same security platform to cloud-delivered SASE. Trade-offs: pricing complexity is the consistent buyer complaint (Prisma Access pricing has multiple tiers, multiple SKUs, and a procurement process that requires Palo Alto sales engagement); the platform's feature density creates implementation complexity; and post-acquisition velocity in the SASE pillar has slowed despite the platform's technical depth.

Netskope is one of the deepest SSE / SASE platforms in the market, founded 2012 with original strength in CASB and now spanning the full SSE stack: CASB, SWG, ZTNA (Netskope Private Access), DLP, RBI, and SD-WAN (acquired Infiot 2022). The company reported ~$700M ARR with IPO speculation across 2024-2025 and is widely viewed as a likely 2026 IPO candidate. Best fit for mid-market to enterprise buyers consolidating multiple security tools onto a single SSE platform, particularly those leading with CASB / DLP requirements. Trade-offs: pricing is opaque and complex (per-module pricing across CASB / SWG / ZTNA / DLP creates surprise costs), the platform's feature density creates implementation complexity, and the company's pre-IPO status creates some buyer caution around enterprise-contract stability.

Cato Networks is the SASE-pure single-cloud-vendor architecture leader, founded 2015 by Shlomo Kramer (Check Point and Imperva co-founder). The product is built ground-up as a single multi-tenant cloud (Cato SASE Cloud) covering SD-WAN, ZTNA, FWaaS, SWG, CASB, DLP, and RBI in a single converged service. The company reported ~$200M ARR with $2B IPO speculation across 2024-2025 and is growing rapidly. Best fit for organizations wanting a single-vendor SD-WAN + ZTNA + security stack without integrating multiple point products. Trade-offs: feature depth in individual pillars is sometimes thinner than best-of-breed (DLP vs Netskope, ZTNA vs Zscaler), customer support quality reports vary by region, and pricing is opaque enterprise-only quotes.

Cisco Secure Access is Cisco's consolidated SSE / SASE offering, bringing together Duo Security (acquired 2018 for $2.4B), Umbrella (DNS-layer security; acquired via OpenDNS 2015 for $635M), and the newer Secure Connect ZTNA module under a unified Security Cloud control plane. Best fit for Cisco-network-anchored enterprises that already run Cisco AnyConnect, Cisco Catalyst SD-WAN, or Cisco firewalls and want consolidated security purchasing. Trade-offs: the platform is the product of multiple acquisitions stitched together (Duo + Umbrella + ThousandEyes + AppDynamics), creating UX inconsistency; product velocity in pure ZTNA lags Zscaler / Cloudflare; per-module pricing creates surprise costs; and the legacy-vendor architecture concern is real (Cisco was late to cloud-native SSE).

Tailscale is the WireGuard-anchored mesh-VPN / ZTNA platform that effectively created the developer-first ZTNA buying motion. Founded 2019 by former Google engineers (including Crawshaw and Pennarun), raised a $100M Series B led by CRV in May 2022 at a reported $1B+ valuation. Best fit for engineering teams, devops shops, and SMB-to-mid-market organizations valuing a frictionless WireGuard mesh over heavy SASE rollouts. The product is famously simple: install agent, authenticate via SSO, machines join the tailnet, ACL policy is declarative. Trade-offs: the May 2024 license switch from BSD/MIT to BSL (Business Source License) raised community concerns about long-term open-source posture (the client remains BSD but the coordination server (control plane) moved to source-available); enterprise compliance features (DLP, CASB, SWG) are absent (Tailscale is pure ZTNA / mesh-VPN, not full SASE); and on-prem / air-gapped deployments require Tailscale Headscale (community OSS) or the commercial Self-Hosted Coordination Server.

Twingate is the modern remote-access / ZTNA platform purpose-built as a clean VPN replacement. Founded 2019, raised Series B $42M in 2022 led by Bessemer Venture Partners (BVP), now backed by BVP, 8VC, and WndrCo. Best fit for SMB-to-mid-market organizations (50-2,000 employees) that want VPN replacement without committing to a full SASE platform. The product is purpose-built around split-tunnel architecture with a centralized policy engine (Twingate Controller) and edge connectors deployed near each resource. Trade-offs: Twingate is pure ZTNA (no SASE breadth: no CASB, no DLP, no SWG); the enterprise tier sales motion is still maturing; integration ecosystem is narrower than Zscaler or Cloudflare; and FedRAMP authorization is absent which excludes federal buyers.

Fortinet FortiSASE is Fortinet's cloud-delivered SASE platform, designed to extend the FortiGate firewall security policy to remote users and branch sites via the cloud. Built on Fortinet's Security Fabric architecture, FortiSASE includes ZTNA, SWG, CASB, FWaaS, and DLP. Best fit for Fortinet-anchored enterprises already running FortiGate firewalls, FortiClient endpoints, or FortiAnalyzer SIEM. Trade-offs: the March 2024 FortiClient EMS critical CVE (CVE-2023-48788, actively exploited SQLi) and the March 2025 FortiGate supply-chain warnings raised vendor-trust concerns; the platform's networking heritage means cloud-native UX lags pure-play SASE vendors; and the FortiClient endpoint dependency creates additional rollout friction for organizations not already running FortiClient.

Perimeter 81 was the mid-market ZTNA / Network-as-a-Service vendor acquired by Check Point Software Technologies in August 2023 for $490M, and rebranded as Check Point Harmony SASE within the broader Harmony platform (alongside Harmony Endpoint, Harmony Email). The product was originally founded 2018 to bring enterprise-grade ZTNA to mid-market buyers, with strong G2 ratings and a transparent published pricing motion (rare in this segment pre-acquisition). Best fit, post-acquisition, for buyers consolidating onto Check Point security; standalone procurement signal has weakened. Trade-offs: post-acquisition product velocity has slowed meaningfully (classic Check Point integration pattern), the former transparent pricing motion has been replaced with Check Point enterprise pricing process, and original mid-market customers report mixed experience with Check Point support transition.