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#navigator.hardwareconcurrency
Status	WHATWG Living Standard

IE	Edge	Firefox	Chrome	Safari	Opera
			103
		100	102
		99	101	TP ⁽¹⁾
11	99	98	100	15.4 ⁽¹⁾	83
10	98	97	99	15.2-15.3 ⁽¹⁾	82
9	97	96	98	15.1 ⁽¹⁾	81
8	96	95	97	15 ⁽¹⁾	80
Show all
7	95	94	96	14.1 ⁽¹⁾	79
6	94	93	95	14 ⁽¹⁾	78
5.5	93	92	94	13.1 ⁽¹⁾	77
	92	91	93	13 ⁽¹⁾	76
	91	90	92	12.1 ⁽¹⁾	75
	90	89	91	12 ⁽¹⁾	74
	89	88	90	11.1 ⁽¹⁾	73
	88	87	89	11 ⁽¹⁾	72
	87	86	88	10.1 ⁽¹⁾	71
	86	85	87	10 ⁽¹⁾	70
	85	84	86	9.1 ⁽¹⁾	69
	84	83	85	9 ⁽¹⁾	68
	83	82	84	8 ⁽¹⁾	67
	81	81	83	7.1	66
	80	80	81	7	65
	79	79	80	6.1	64
	18	78	79	6	63
	17	77	78	5.1	62
	16	76	77	5	60
	15	75	76	4	58
	14	74	75	3.2	57
	13	73	74	3.1	56
	12	72	73		55
		71	72		54
		70	71		53
		69	70		52
		68	69		51
		67	68		50
		66	67		49
		65	66		48
		64	65		47
		63	64		46
		62	63		45
		61	62		44
		60	61		43
		59	60		42
		58	59		41
		57	58		40
		56	57		39
		55	56		38
		54	55		37
		53	54		36
		52	53		35
		51	52		34
		50	51		33
		49	50		32
		48	49		31
		47	48		30
		46	47		29
		45	46		28
		44	45		27
		43	44		26
		42	43		25
		41	42		24
		40	41		23
		39	40		22
		38	39		21
		37	38		20
		36	37		19
		35	36		18
		34	35		17
		33	34		16
		32	33		15
		31	32		12.1
		30	31		12
		29	30		11.6
		28	29		11.5
		27	28		11.1
		26	27		11
		25	26		10.6
		24	25		10.5
		23	24		10.0-10.1
		22	23		9.5-9.6
		21	22		9
		20	21
		19	20
		18	19
		17	18
		16	17
		15	16
		14	15
		13	14
		12	13
		11	12
		10	11
		9	10
		8	9
		7	8
		6	7
		5	6
		4	5
		3.6	4
		3.5
		3
		2

Safari on iOS	Opera Mini	Android Browser	Blackberry Browser	Opera Mobile	Android Chrome	Android Firefox	IE Mobile	Android UC Browser	Samsung Internet	QQ Browser	Baidu Browser	KaiOS Browser
15.4 ⁽¹⁾	all	99	10	64	100	98	11	12.12	16.0	10.4	7.12	2.5
15.2-15.3 ⁽¹⁾		4.4.3-4.4.4	7	12.1			10		15.0
15.0-15.1 ⁽¹⁾		4.4		12					14.0
14.5-14.8 ⁽¹⁾		4.2-4.3		11.5					13.0
Show all
14.0-14.4 ⁽¹⁾		4.1		11.1					12.0
13.4-13.7 ⁽¹⁾		4		11					11.1-11.2
13.3 ⁽¹⁾		3		10					10.1
13.2 ⁽¹⁾		2.3							9.2
13.0-13.1 ⁽¹⁾		2.2							8.2
12.2-12.5 ⁽¹⁾		2.1							7.2-7.4
12.0-12.1 ⁽¹⁾									6.2-6.4
11.3-11.4 ⁽¹⁾									5.0-5.4
11.0-11.2 ⁽¹⁾									4
10.3 ⁽¹⁾
10.0-10.2 ⁽¹⁾
9.3 ⁽¹⁾
9.0-9.2 ⁽¹⁾
8.1-8.4 ⁽¹⁾
8 ⁽¹⁾
7.0-7.1
6.0-6.1
5.0-5.1
4.2-4.3
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.
https://caniuse.com/hardwareconcurrency

Name	Support Tables
Version
Badge
Last Updated	2022-04-11T17:49:08Z