Device Memory API

Limited availability

This feature is not Baseline because it does not work in some of the most widely-used browsers.

See full compatibility

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

Note: This feature is available in Web Workers.

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 or WorkerNavigator.deviceMemory.

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.

Interfaces

Extensions to other interfaces

Navigator.deviceMemory Read only: Returns the approximate amount of device memory in gigabytes.
WorkerNavigator.deviceMemory Read only: Returns the approximate amount of device memory in gigabytes.

Specifications

Specification
Device Memory API

Browser compatibility

api.Navigator.deviceMemory

	desktop					mobile							server
	Chrome	Edge	Firefox	Opera	Safari	Chrome Android	Firefox for Android	Opera Android	Safari on iOS	Samsung Internet	WebView Android	WebView on iOS	Node.js
`deviceMemory`	Chrome – Full support Chrome 63 (Release date: 2017-12-06) footnote footnote From Chrome 147, reported values are 2, 4, 8, 16, and 32. footnote Before Chrome 147, reported values were 0.25, 0.5, 1, 2, 4, and 8.	Edge – Full support Edge 79 (Release date: 2020-01-15) footnote footnote From Edge 147, reported values are 2, 4, 8, 16, and 32. footnote Before Edge 147, reported values were 0.25, 0.5, 1, 2, 4, and 8.	Firefox – No support Firefox footnote No support	Opera – Full support Opera 50 (Release date: 2018-01-04) footnote footnote From Opera 131, reported values are 2, 4, 8, 16, and 32. footnote Before Opera 131, reported values were 0.25, 0.5, 1, 2, 4, and 8.	Safari – No support Safari footnote No support	Chrome Android – Full support Chrome Android 63 (Release date: 2017-12-05) footnote footnote From Chrome 147, reported values are 1, 2, 4, and 8. footnote Before Chrome 147, reported values were 0.25, 0.5, 1, 2, 4, and 8.	Firefox for Android – No support Firefox for Android footnote No support	Opera Android – Full support Opera Android 46 (Release date: 2018-05-14) footnote footnote From Chrome 147, reported values are 1, 2, 4, and 8. footnote Before Chrome 147, reported values were 0.25, 0.5, 1, 2, 4, and 8.	Safari on iOS – No support Safari on iOS footnote No support	Samsung Internet – Full support Samsung Internet 8 (Release date: 2018-07-18) footnote footnote From Chrome 147, reported values are 1, 2, 4, and 8. footnote Before Chrome 147, reported values were 0.25, 0.5, 1, 2, 4, and 8.	WebView Android – Full support WebView Android 63 (Release date: 2017-12-05) footnote footnote From Chrome 147, reported values are 1, 2, 4, and 8. footnote Before Chrome 147, reported values were 0.25, 0.5, 1, 2, 4, and 8.	WebView on iOS – No support WebView on iOS footnote No support	Node.js – No support Node.js footnote No support

Tip: you can click/tap on a cell for more information.

Full support: Full support
No support: No support
: See implementation notes.

api.WorkerNavigator.deviceMemory

	desktop					mobile							server
	Chrome	Edge	Firefox	Opera	Safari	Chrome Android	Firefox for Android	Opera Android	Safari on iOS	Samsung Internet	WebView Android	WebView on iOS	Deno
`deviceMemory`	Chrome – Full support Chrome 65 (Release date: 2018-03-06) footnote footnote From Chrome 147, reported values are 2, 4, 8, 16, and 32. footnote Before Chrome 147, reported values are 0.25, 0.5, 1, 2, 4, and 8.	Edge – Full support Edge 79 (Release date: 2020-01-15) footnote footnote From Edge 147, reported values are 2, 4, 8, 16, and 32. footnote Before Edge 147, reported values are 0.25, 0.5, 1, 2, 4, and 8.	Firefox – No support Firefox footnote No support	Opera – Full support Opera 52 (Release date: 2018-03-22) footnote footnote From Opera 131, reported values are 2, 4, 8, 16, and 32. footnote Before Opera 131, reported values are 0.25, 0.5, 1, 2, 4, and 8.	Safari – No support Safari footnote No support	Chrome Android – Full support Chrome Android 65 (Release date: 2018-03-06) footnote footnote From Chrome 147, reported values are 1, 2, 4, and 8. footnote Before Chrome 147, reported values were 0.25, 0.5, 1, 2, 4, and 8.	Firefox for Android – No support Firefox for Android footnote No support	Opera Android – Full support Opera Android 47 (Release date: 2018-07-23) footnote footnote From Chrome 147, reported values are 1, 2, 4, and 8. footnote Before Chrome 147, reported values were 0.25, 0.5, 1, 2, 4, and 8.	Safari on iOS – No support Safari on iOS footnote No support	Samsung Internet – Full support Samsung Internet 9 (Release date: 2018-09-15) footnote footnote From Chrome 147, reported values are 1, 2, 4, and 8. footnote Before Chrome 147, reported values were 0.25, 0.5, 1, 2, 4, and 8.	WebView Android – Full support WebView Android 65 (Release date: 2018-03-06) footnote footnote From Chrome 147, reported values are 1, 2, 4, and 8. footnote Before Chrome 147, reported values were 0.25, 0.5, 1, 2, 4, and 8.	WebView on iOS – No support WebView on iOS footnote No support	Deno – No support Deno footnote No support

Tip: you can click/tap on a cell for more information.

Full support: Full support
No support: No support
: See implementation notes.

http.headers.Sec-CH-Device-Memory

	desktop					mobile
	Chrome	Edge	Firefox	Opera	Safari	Chrome Android	Firefox for Android	Opera Android	Safari on iOS	Samsung Internet	WebView Android	WebView on iOS
`Sec-CH-Device-Memory` request header Experimental	Chrome – Full support Chrome 61 (Release date: 2017-09-05) footnote , altname altname Alternate name: Device-Memory footnote Before Chrome 147, reported values were 0.25, 0.5, 1, 2, 4, and 8. footnote From Chrome 147, reported values are 2, 4, 8, 16, and 32. Chrome – Full support Chrome 97 (Release date: 2022-01-04) footnote footnote Before Chrome 147, reported values were 0.25, 0.5, 1, 2, 4, and 8. footnote From Chrome 147, reported values are 2, 4, 8, 16, and 32.	Edge – Full support Edge 79 (Release date: 2020-01-15) footnote , altname altname Alternate name: Device-Memory footnote Before Edge 147, reported values were 0.25, 0.5, 1, 2, 4, and 8. footnote From Edge 147, reported values are 2, 4, 8, 16, and 32. Edge – Full support Edge 97 (Release date: 2022-01-06) footnote footnote Before Edge 147, reported values were 0.25, 0.5, 1, 2, 4, and 8. footnote From Edge 147, reported values are 2, 4, 8, 16, and 32.	Firefox – No support Firefox footnote No support	Opera – Full support Opera 48 (Release date: 2017-09-27) footnote , altname altname Alternate name: Device-Memory footnote Before Opera 131, reported values were 0.25, 0.5, 1, 2, 4, and 8. footnote From Opera 131, reported values are 2, 4, 8, 16, and 32. Opera – Full support Opera 83 (Release date: 2022-01-19) footnote footnote Before Opera 131, reported values were 0.25, 0.5, 1, 2, 4, and 8. footnote From Opera 131, reported values are 2, 4, 8, 16, and 32.	Safari – No support Safari footnote No support	Chrome Android – Full support Chrome Android 61 (Release date: 2017-09-05) footnote , altname altname Alternate name: Device-Memory footnote From Chrome 147, reported values are 1, 2, 4, and 8. footnote Before Chrome 147, reported values were 0.25, 0.5, 1, 2, 4, and 8. Chrome Android – Full support Chrome Android 97 (Release date: 2022-01-04) footnote footnote From Chrome 147, reported values are 1, 2, 4, and 8. footnote Before Chrome 147, reported values were 0.25, 0.5, 1, 2, 4, and 8.	Firefox for Android – No support Firefox for Android footnote No support	Opera Android – Full support Opera Android 45 (Release date: 2018-02-15) footnote , altname altname Alternate name: Device-Memory footnote From Chrome 147, reported values are 1, 2, 4, and 8. footnote Before Chrome 147, reported values were 0.25, 0.5, 1, 2, 4, and 8. Opera Android – Full support Opera Android 68 (Release date: 2022-03-30) footnote footnote From Chrome 147, reported values are 1, 2, 4, and 8. footnote Before Chrome 147, reported values were 0.25, 0.5, 1, 2, 4, and 8.	Safari on iOS – No support Safari on iOS footnote No support	Samsung Internet – Full support Samsung Internet 8 (Release date: 2018-07-18) footnote , altname altname Alternate name: Device-Memory footnote From Chrome 147, reported values are 1, 2, 4, and 8. footnote Before Chrome 147, reported values were 0.25, 0.5, 1, 2, 4, and 8. Samsung Internet – Full support Samsung Internet 18 (Release date: 2022-08-08) footnote footnote From Chrome 147, reported values are 1, 2, 4, and 8. footnote Before Chrome 147, reported values were 0.25, 0.5, 1, 2, 4, and 8.	WebView Android – Full support WebView Android 61 (Release date: 2017-09-05) footnote , altname altname Alternate name: Device-Memory footnote From Chrome 147, reported values are 1, 2, 4, and 8. footnote Before Chrome 147, reported values were 0.25, 0.5, 1, 2, 4, and 8. WebView Android – Full support WebView Android 97 (Release date: 2022-01-04) footnote footnote From Chrome 147, reported values are 1, 2, 4, and 8. footnote Before Chrome 147, reported values were 0.25, 0.5, 1, 2, 4, and 8.	WebView on iOS – No support WebView on iOS footnote No support

Tip: you can click/tap on a cell for more information.

Full support: Full support
No support: No support
: Experimental. Expect behavior to change in the future.
: See implementation notes.
: Uses a non-standard name
: Has more compatibility info.

Device Memory API

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