Zscaler vs Prisma Access when the firewall team and the proxy team both want the SASE contract

Three VPN concentrators, 110 branch circuits, and a renewal date on the Palo Alto firewalls that already run the data center. That is the usual starting line for this pair. Both vendors sell cloud-delivered secure web gateway, ZTNA, CASB, and DLP. They differ on whether the cloud is a proxy exchange or a firewall stack delivered as a service.

Zscaler sells ZIA for internet and SaaS traffic and ZPA for private applications, brokered through App Connectors on the Zero Trust Exchange. Prisma Access is Palo Alto Networks’ cloud-delivered security service, licensed for mobile users and remote networks and managed alongside Strata firewalls in Strata Cloud Manager.

Buy Zscaler when internet and private app access should move to a proxy exchange separate from the firewall fleet. Buy Prisma Access when the same PAN-OS policy model and Strata Cloud Manager should cover branches, users, and data center firewalls.

Overview

	Zscaler	Prisma Access
Primary use case	ZIA secure web gateway, firewall, DLP, and inline CASB for internet and SaaS, plus ZPA for private application access without network-level access	Prisma Access cloud-delivered NGFW, SWG, ZTNA, CASB, and DLP for mobile users and remote networks, part of Prisma SASE with Prisma SD-WAN
Day-to-day workflow	Push the Zscaler root, stage TLS inspection by URL category, tune DLP from monitor to block, connect SaaS tenants to the API, and define ZPA app segments behind App Connectors	Onboard mobile users and remote network sites, build security policy rules in Strata Cloud Manager, and attach Advanced Threat Prevention, Advanced URL Filtering, and DLP profiles shared with on-prem firewalls
Main buying consideration	Quote by user for ZIA and ZPA editions (Business, Transformation, and Unlimited bundles on the Zscaler platform). No public USD on zscaler.com when checked 10 Oct 2026	Quote by mobile user count and remote network bandwidth in Mbps, with Business, Business Premium, and ZTNA editions. No public USD on paloaltonetworks.com when checked 10 Oct 2026

We reviewed the Zscaler SSL/TLS inspection guide, ZIA DLP deployment guide, SaaS Security API guide, and ZPA documentation, plus the Mercury Financial customer story, and Palo Alto Networks Prisma Access administration documentation for mobile users, remote networks, service connections, and Strata Cloud Manager, on 10 Oct 2026. We did not run either service in a paid tenant.

Zscaler

Prisma Access

Editions and pricing

Neither vendor prints a price. The metering units differ: Zscaler meters users per platform bundle, Prisma Access meters mobile users plus remote network bandwidth.

	Zscaler	Prisma Access
How it is sold	Zscaler platform bundles by user, combining ZIA, ZPA, and ZDX at different depths, with add-ons such as Advanced DLP and Browser Isolation	Prisma Access licenses for mobile users and for remote networks by aggregate bandwidth, with add-on security subscriptions and Prisma SD-WAN as a separate line
Figure on the public page	No USD on zscaler.com. AWS Marketplace private offers exist without a printed list price	No USD on paloaltonetworks.com. Pricing is through Palo Alto Networks sales and partners
What the unit counts	Users covered by ZIA or ZPA, with traffic forwarded by Zscaler Client Connector, GRE or IPsec tunnels, or PAC files	Mobile users, and remote network Mbps allocated per compute location. Service connections to data centers are included in the remote network license in the administration guide

Inspection and data protection

Both services decrypt, inspect, and apply DLP inline. The split is a proxy-first exchange versus PAN-OS security profiles running in the cloud.

	Zscaler	Prisma Access
TLS inspection	ZIA SSL/TLS inspection staged by location and URL category, with certificate-pinned and mutually authenticated TLS on the do-not-decrypt list	Decryption policy rules in Strata Cloud Manager using the same decryption profiles as PAN-OS firewalls, with exclusions for pinned applications
DLP	ZIA DLP for data in motion with Zscaler engines or forwarding to third-party DLP, started in monitor then block	Enterprise DLP subscription shared across Prisma Access, NGFWs, and SaaS Security, with predefined and custom data patterns
SaaS at rest	SaaS Security API scans data at rest in connected SaaS tenants out of band	SaaS Security API connects sanctioned SaaS for at-rest scanning under Prisma SaaS Security

Private access and connectivity

Both replace VPN for private apps and connect branches. The documented split is application brokering versus network onramps into a cloud firewall.

	Zscaler	Prisma Access
Private app access	ZPA App Connectors make outbound connections so private apps are never exposed inbound; users reach app segments, not the network	ZTNA Connector or service connections reach private apps, with mobile users connecting through GlobalProtect or agentless browser access
Branch onramp	GRE or IPsec tunnels from branch routers to Zscaler data centers, or Zscaler Zero Trust Branch appliances	Remote networks connect over IPsec from branch firewalls or Prisma SD-WAN, licensed by bandwidth
Experience monitoring	ZDX monitors device, network, and application performance for users on Client Connector	Autonomous DEM add-on monitors user experience for Prisma Access mobile users and remote networks

Favor Zscaler when the documented requirement is ZIA staged TLS inspection and DLP, SaaS Security API for data at rest, and ZPA App Connectors brokering private apps without network access. Favor Prisma Access when the documented requirement is mobile user and remote network licensing, PAN-OS security profiles in the cloud, and one Strata Cloud Manager policy across Prisma Access and Palo Alto firewalls.