AI Usage Control vs CASB and SWG: What Each One Sees

By Identra · Updated October 2, 2026

A secure web gateway controls the network path and a CASB controls sanctioned cloud apps through their APIs and traffic. AI usage control works in browser sessions, on devices and through identity grants. It sees which account is signed in, what is in a prompt before it is sent, which extensions are reading the page and which agents are acting. Most organizations keep their gateway and CASB and add AI usage control for what those layers cannot see.

Question	SWG	CASB	AI usage control
Where it works	Network path	Cloud app APIs and traffic	Browser session, device and identity grants
Sees the signed-in account	With tenant or account controls configured	For sanctioned apps	Yes, for supported AI apps
Sees the prompt before send	Only if traffic is decrypted	Depends on deployment	On the device, before send
Sees browser extensions	No	No	Yes
Sees agents driving the browser or tool calls	No	No	Yes
Typical action	Allow or block traffic	Policy on sanctioned apps	Allow, redirect, mask or block by policy

Where it works
AI usage control
Browser session, device and identity grants
SWG
Network path
CASB
Cloud app APIs and traffic
Sees the signed-in account
AI usage control
Yes, for supported AI apps
SWG
With tenant or account controls configured
CASB
For sanctioned apps
Sees the prompt before send
AI usage control
On the device, before send
SWG
Only if traffic is decrypted
CASB
Depends on deployment
Sees browser extensions
AI usage control
Yes
SWG
No
CASB
No
Sees agents driving the browser or tool calls
AI usage control
Yes
SWG
No
CASB
No
Typical action
AI usage control
Allow, redirect, mask or block by policy
SWG
Allow or block traffic
CASB
Policy on sanctioned apps

What SWG and CASB were built for

A secure web gateway sits on the network path between people and the internet. It filters destinations, scans downloads and applies data rules to traffic it can inspect, which makes it a broad control for everything routed through it. It was designed to answer where traffic is going and whether that destination is allowed.

A cloud access security broker focuses on sanctioned cloud apps. Through APIs and inline traffic it can see how data is stored and shared inside those apps, flag risky configurations and apply policy to the tenants the organization owns. It was designed to answer what is happening inside the cloud apps the company has approved. For how gateways compare with browser-layer controls more broadly, see enterprise browser vs SWG and SASE.

What changes with AI

AI moves the risk into places those designs did not anticipate. Work and personal use of the same AI app often reach the same domain, so a destination rule cannot tell them apart. Prompts are written and pasted inside the page, and the decision about whether that text should leave is best made before it is sent. Much of the AI people use is not a sanctioned tenant at all, which is the core of shadow AI.

AI also adds actors that never cross a gateway as a person would. Browser extensions read pages and AI conversations from inside the session. Agents drive the browser, call tools on a laptop or act through OAuth grants in identity providers. These are questions about accounts, extensions and agents, not about traffic.

Where AI usage control works

AI usage control runs where AI is used: in the browser session, on the device and in identity grants. In the browser it can see which account is signed in to an AI app, check a prompt before it is sent, and see which extensions are installed and which agents are driving the page. On the device it can see coding agents, desktop AI apps and the tool calls they make.

Because it sits at the point of use, it can apply policy that matches the situation: allow a company account, redirect a personal account to the company AI workspace, mask sensitive data or block by policy. The browser side of this builds on enterprise browser security, with identity tying browser, device and provider signals to the person behind them.

Using them together

These controls answer different questions, so most organizations run them side by side. The gateway keeps broad control of the network path and non-browser traffic. The CASB keeps watch over sanctioned cloud apps and their data. AI usage control adds what happens inside the session and on the device: the signed-in account, the prompt before it is sent, the extensions reading the page and the agents acting.

A practical sequence is to keep existing gateway and CASB policy in place, start AI usage control with discovery of the AI apps, accounts, extensions and agents already in use, and then add account, data and agent policy where the risk is highest. The result is layered coverage instead of a gap between what the network sees and what people actually do with AI.

Frequently asked questions

Does AI usage control replace a CASB or SWG?

No. They answer different questions, and most organizations run them together.

Can a SWG block personal AI accounts?

Some gateways can restrict personal accounts for supported AI apps when traffic inspection and tenant or account controls are configured. Browser controls read the signed-in account in the session itself, before a request is sent, so they can also redirect a personal account to the company AI workspace.

Where should AI usage control run?

Where AI is used: the browser session, the device and identity grants.

More comparisons

All comparisons →