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navigator.hardwareConcurrency

Returns the number of logical cores of the user's CPU. The value may be reduced to prevent device fingerprinting or because it exceeds the allowed number of simultaneous web workers.

Spec	https://html.spec.whatwg.org/multipage/workers.html#navigatorconcurrenthardware
Status	WHATWG Living Standard

IE	Edge	Firefox	Chrome	Safari	Opera
		57	62
		56	61	TP ⁽¹⁾	48
	16	55	60	11 ⁽¹⁾	47
11	15	54	59	10.1 ⁽¹⁾	46
10	14	53	58	10 ⁽¹⁾	45
9	13	52	57	9.1 ⁽¹⁾	44
8	12	51	56	9 ⁽¹⁾	43
Show all
7		50	55	8 ⁽¹⁾	42
6		49	54	7.1	41
5.5		48	53	7	40
		47	52	6.1	39
		46	51	6	38
		45	50	5.1	37
		44	49	5	36
		43	48	4	35
		42	47	3.2	34
		41	46	3.1	33
		40	45		32
		39	44		31
		38	43		30
		37	42		29
		36	41		28
		35	40		27
		34	39		26
		33	38		25
		32	37		24
		31	36		23
		30	35		22
		29	34		21
		28	33		20
		27	32		19
		26	31		18
		25	30		17
		24	29		16
		23	28		15
		22	27		12.1
		21	26		12
		20	25		11.6
		19	24		11.5
		18	23		11.1
		17	22		11
		16	21		10.6
		15	20		10.5
		14	19		10.0-10.1
		13	18		9.5-9.6
		12	17		9
		11	16
		10	15
		9	14
		8	13
		7	12
		6	11
		5	10
		4	9
		3.6	8
		3.5	7
		3	6
		2	5
			4

iOS Safari	Opera Mini	Android Browser	Blackberry Browser	Opera Mobile	Android Chrome	Android Firefox	IE Mobile	Android UC Browser	Samsung Internet	QQ Browser	Baidu Browser
11 ⁽¹⁾
10.3 ⁽¹⁾	all	56	10	37	59	54	11	11.4	5	1.2	7.12
10.0-10.2 ⁽¹⁾		4.4.3-4.4.4	7	12.1			10		4
9.3 ⁽¹⁾		4.4		12
9.0-9.2 ⁽¹⁾		4.2-4.3		11.5
Show all
8.1-8.4 ⁽¹⁾		4.1		11.1
8 ⁽¹⁾		4		11
7.0-7.1		3		10
6.0-6.1		2.3
5.0-5.1		2.2
4.2-4.3		2.1
4.0-4.1
3.2

Notes

Webkit browsers clamp the maximum value returned to 2 on iOS devices and 8 on all others. Disabled in Safari behind the ENABLE_NAVIGATOR_HWCONCURRENCY build option.

Resources

Data by caniuse.com
Licensed under the Creative Commons Attribution License v4.0.
http://caniuse.com/#feat=hardwareconcurrency