Best Zscaler Alternatives for Cloud Application Security in 2026

Securing SaaS and cloud application usage requires visibility into which apps employees use (Shadow IT discovery), control over what data can be shared through cloud apps (DLP and CASB), and the ability to detect compromised accounts and insider threats (UEBA). Zscaler provides C

Best picks for this use case

#1

Netskope

Netskope is the undisputed leader in cloud application security with its Cloud XD engine providing activity-level visibility and controls for thousands of SaaS apps. Its inline and API CASB, advanced DLP with exact data matching, and UEBA for insider threat detection make it the most comprehensive cloud app security platform available.

Cloud-native SASE platform with industry-leading CASB and granular SaaS visibility

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#2

Skyhigh Security

The CASB pioneer with a Cloud Registry of 40,000+ cloud services rated for enterprise risk. Skyhigh's API-based CASB provides the deepest out-of-band SaaS posture management, and its DLP with OCR and exact data match is purpose-built for regulated industries requiring the strictest data protection controls.

Data-aware SSE platform with pioneering CASB technology and deep cloud data protection

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#3

Palo Alto Prisma Access

Prisma Access combines inline CASB with Palo Alto's enterprise DLP and WildFire threat analysis, providing cloud app security backed by Unit 42 threat intelligence. Its ZTNA 2.0 extends continuous security monitoring into SaaS sessions, not just initial access decisions.

Enterprise SASE platform extending Palo Alto's next-gen firewall to cloud-delivered security

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#4

Cloudflare Zero Trust

Cloudflare provides growing CASB and DLP capabilities at the most accessible price point, making cloud app security achievable for organizations that cannot justify Netskope or Zscaler pricing. Its API-based SaaS scanning and Shadow IT reporting provide essential cloud governance without enterprise complexity.

Developer-friendly zero trust platform built on Cloudflare's global Anycast network

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#5

Cisco Secure Access

Cisco Secure Access combines Umbrella's cloud app visibility with Duo's zero trust access controls, providing a solid foundation for cloud app security in Cisco-centric environments. Talos threat intelligence adds context to cloud app risk assessments.

Cisco's unified SASE platform converging Umbrella, Duo, and Meraki into cloud-delivered security

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How to implement this

  1. 1

    Discover and Assess Shadow IT

    Deploy inline traffic inspection to discover all cloud services in use across the organization. Categorize discovered apps by risk level using the platform's cloud service database (Netskope Cloud Confidence Index, Skyhigh Cloud Registry, or equivalent). Identify unsanctioned high-risk apps that require blocking and sanctioned apps that need governance policies.

  2. 2

    Define Cloud Application Policies

    Establish policies for sanctioned SaaS apps including allowed activities (upload, download, share, edit), data types that can be stored, and user groups with access. Define Shadow IT policies — block high-risk apps, allow with coaching for medium-risk, and monitor low-risk. Configure tenant restrictions to prevent data exfiltration through personal accounts of sanctioned services.

  3. 3

    Enable Inline and API CASB

    Deploy inline CASB through the SWG/SASE agent to enforce real-time controls on cloud app traffic. Configure API-based CASB connections to sanctioned SaaS apps (Microsoft 365, Google Workspace, Salesforce, Box) for out-of-band scanning, compliance monitoring, and retroactive policy enforcement on data at rest.

  4. 4

    Configure Data Loss Prevention

    Define DLP policies for sensitive data types including PII, PHI, PCI, intellectual property, and custom data patterns. Enable exact data matching for high-value records (customer databases, employee files), document fingerprinting for confidential documents, and OCR for sensitive data in images. Apply DLP policies to cloud app uploads, downloads, and sharing actions.

  5. 5

    Monitor User Behavior and Respond to Incidents

    Enable UEBA to baseline normal cloud app usage patterns and detect anomalies such as bulk downloads, unusual sharing, off-hours access, or impossible travel. Configure automated responses including step-up authentication, blocking, manager notification, and SOC alerting. Establish regular review processes for cloud app security posture, DLP violations, and Shadow IT trends.

Frequently Asked Questions

Inline CASB inspects cloud app traffic in real time as it passes through the SWG/SASE proxy, enabling real-time blocking of policy violations such as uploading sensitive data to an unsanctioned app. API-based CASB connects directly to sanctioned SaaS apps (via API) to scan data at rest, audit configurations, monitor sharing settings, and enforce compliance policies retroactively. The most effective cloud app security uses both: inline CASB for real-time traffic enforcement and API-based CASB for SaaS posture management and data-at-rest scanning.

Netskope leads in overall CASB capability with the deepest inline activity-level controls through Cloud XD and strong API-based CASB. Skyhigh Security has the largest cloud service risk database (40,000+ apps) and the most mature API-based CASB inherited from its pioneering CASB heritage. Zscaler's CASB is capable but less granular than Netskope at the activity level. For inline CASB, choose Netskope. For API-based SaaS posture management and the broadest app risk assessment, choose Skyhigh.

Implement tenant restrictions (also called instance awareness) in your CASB to distinguish between corporate and personal instances of the same SaaS app. For example, allow uploads to your corporate Microsoft 365 tenant but block uploads to personal OneDrive accounts. Netskope, Zscaler, and Palo Alto all support tenant restrictions for major SaaS platforms. Additionally, configure DLP policies to detect and block sensitive data being shared externally, and use UEBA to detect unusual data movement patterns that may indicate exfiltration.

A SWG alone provides URL-level allow/block decisions and malware scanning for web traffic, but it cannot control specific activities within allowed applications. For example, a SWG can allow access to Box.com but cannot prevent a user from downloading all files and uploading them to a personal Dropbox. CASB adds activity-level controls (allow browse but block download), DLP adds content-level inspection (block if file contains PII), and UEBA adds behavioral analysis (alert if this user is downloading 10x their normal volume). For any organization with significant SaaS usage, CASB and DLP are essential complements to SWG.
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