Zscaler CASB review
A broad, proxy-based CASB for inline inspection, API scanning, DLP, and cloud threat protection.
Reviewed by iTechGuides Editors · Editorial team · Updated Oct 2026
Zscaler CASB is a cloud-delivered cloud access security broker for organizations securing SaaS and IaaS environments. It is designed for businesses that want proxy-based controls across sanctioned and unsanctioned cloud applications, with coverage for data in motion and at rest. The product combines inline, real-time inspection with out-of-band API scanning, making it suitable for teams that need both traffic controls and visibility into cloud platforms. Its hybrid deployment model supports web and API access, while published capabilities include DLP, shadow IT discovery, cloud application controls, and threat protection.
The product’s main strength is breadth across preventive and investigative controls. Inline proxy security and TLS/SSL inspection address real-time traffic, while API scanning examines SaaS and cloud platforms outside the traffic path. Organizations can apply controls to applications, tenants, and categories; protect sanctioned and unsanctioned cloud applications with DLP; and use cloud sandboxing and malware threat protection. Risky file-share detection and remediation, compliance visibility, logging, and reporting extend the product beyond basic application discovery. This combination suits security teams standardizing controls across multiple cloud usage patterns rather than teams seeking a single-purpose discovery tool.
Pricing is sales-led, with no free plan. The Essentials Platform includes Secure Internet Access, ZPA Standard, and standard data security and cyberthreat capabilities. The Zscaler Platform adds Secure Internet Access, Private Access for all users, and Data Security for inline web and all apps. The published plans describe CASB as an add-on, so buyers should evaluate the required bundle and CASB scope with Zscaler. Choose Zscaler CASB when inline inspection, API controls, DLP, and remediation belong in one cloud security program; consider a narrower product if those capabilities are unnecessary.
Zscaler CASB pros and cons
- Where it wins
- Combines inline TLS/SSL inspection with out-of-band SaaS and cloud API scanning
- Covers shadow IT discovery, DLP, malware protection, and risky file-share remediation
- Adds tenant, application, category controls plus compliance visibility and reporting
- Where it doesn't
- CASB pricing follows a contact-sales model
- There is no free plan
- Its broad control set may exceed the needs of narrowly focused teams
Zscaler CASB fact sheet, pricing and score →
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