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Device Memory API

Secure context: This feature is available only in secure contexts (HTTPS), in some or all supporting browsers.

Experimental: This is an experimental technology
Check the Browser compatibility table carefully before using this in production.

The capabilities of a client device largely depend on the amount of available RAM. Traditionally, developers had to use heuristics and either benchmark a device or infer device capabilities based on other factors like the device manufacturer or User Agent strings.

Determining device memory

There are two ways to determine the approximate amount of RAM a device has: use the Device Memory JavaScript API or accept Client Hints.

JavaScript API

You may query the approximate amount of RAM a device has by retrieving Navigator.deviceMemory

js

const RAM = navigator.deviceMemory;

Client Hints

You may also use the Client Hints HTTP Header with the Device-Memory directive to retrieve the same approximate RAM capacity.

Specifications

Browser compatibility

Desktop Mobile
Chrome Edge Firefox Internet Explorer Opera Safari WebView Android Chrome Android Firefox for Android Opera Android Safari on IOS Samsung Internet
Device_Memory_API 61 ≤79 No No 48 No 61 61 No No No 8.0
Desktop Mobile
Chrome Edge Firefox Internet Explorer Opera Safari WebView Android Chrome Android Firefox for Android Opera Android Safari on IOS Samsung Internet
Device_Memory_API 63 79 No No 50 No 63 63 No 46 No 8.0

api.Navigator.deviceMemory

BCD tables only load in the browser

http.headers.Device-Memory

BCD tables only load in the browser

See also

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https://developer.mozilla.org/en-US/docs/Web/API/Device_Memory_API