#258BEA

Closest named color: Dark Sky Blue (#448EE4). oklch(62.9% 0.168 251.5), rgb(37, 139, 234).

Black text reads best on this color (5.95:1).

About this color

#258BEA is a medium-light, vivid blue. In OKLCH its lightness is 63%, its chroma 0.168 and its hue 252°. Its hue sits on the cool side of the wheel. The nearest named color is Dark Sky Blue (#448EE4), ΔE 0.024 away. Black text reads best on it, at 5.95:1.

Hue family	Blues
Lightness	medium-light (63%)
Chroma	vivid (0.168)
Temperature	cool
Nearest name	Dark Sky Blue (#448EE4)
Black text	5.95:1
White text	3.52:1

Values

HEX	#258BEA
RGB	rgb(37, 139, 234)
HSL	hsl(209, 82%, 53%)
OKLCH	oklch(62.9% 0.168 251.5)

Contrast

WCAG 2 contrast ratios are the conformance target: AA needs 4.5:1 for body text and 3:1 for large text, AAA needs 7:1. APCA Lc values are supplementary guidance from the WCAG 3 drafts.

Pair	WCAG 2	Result	APCA	APCA guidance
White text on #258BEA	3.52:1	AA large text	Lc -67.8	Content text, not long reading
Black text on #258BEA	5.95:1	AA	Lc 41.8	Non-text elements, placeholder text
#258BEA text on white	3.52:1	AA large text	Lc 62.3	Content text, not long reading
#258BEA text on black	5.95:1	AA	Lc -39.4	Non-text elements, placeholder text

Tints and shades

A 50–950 scale built in OKLCH: the hue is held, lightness follows a Tailwind v4-like curve, and every step is kept inside the sRGB gamut. This color sits at step 500.

Step 50
50

#F0F6FD

oklch(97.1% 0.011 252.1)
Step 100
100

#DFEBFA

oklch(93.6% 0.024 254)
Step 200
200

#C4DCF7

oklch(88.5% 0.045 251.4)
Step 300
300

#9AC5F5

oklch(81% 0.082 251.6)
Step 400
400

#5EA5F0

oklch(70.8% 0.132 251.3)
Step 500
500 (this color)

#258BEA

oklch(62.9% 0.168 251.5)
Step 600
600

#0074CF

oklch(55.5% 0.165 251.7)
Step 700
700

#0062AF

oklch(49.2% 0.144 251.3)
Step 800
800

#005091

oklch(42.8% 0.126 251.5)
Step 900
900

#024279

oklch(37.6% 0.11 251.7)
Step 950
950

#072747

oklch(26.9% 0.07 252)

Export this scale for Tailwind in the Tailwind colors tool

#258BEA with color blindness

Simulated with the Machado et al. (2009) model. ΔE is how far the color moves: below about 0.02 you would not notice a change.

Vision	Seen as	Shift (ΔE)
Protanopia (no red cones)	#5C92EE	0.048
Deuteranopia (no green cones)	#3981E8	0.026
Tritanopia (no blue cones)	#00A2AF	0.124
Achromatopsia (no color)	#888888	0.168