#2588BD
Closest named color: Blue NCS (#118AB2). oklch(59.6% 0.119 237.8), rgb(37, 136, 189).
Aa
Black text reads best on this color (5.33:1).
About this color
#2588BD is a medium-dark, moderately saturated blue. In OKLCH its lightness is 60%, its chroma 0.119 and its hue 238°. Its hue sits on the cool side of the wheel. The nearest named color is Blue NCS (#118AB2), ΔE 0.021 away. Black text reads best on it, at 5.33:1.
| Hue family | Blues |
| Lightness | medium-dark (60%) |
| Chroma | moderately saturated (0.119) |
| Temperature | cool |
| Nearest name | Blue NCS (#118AB2) |
| Black text | 5.33:1 |
| White text | 3.93:1 |
Values
| HEX | #2588BD |
| RGB | rgb(37, 136, 189) |
| HSL | hsl(201, 67%, 44%) |
| OKLCH | oklch(59.6% 0.119 237.8) |
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 #2588BD | 3.93:1 | AA large text | Lc -71.8 | Content text, not long reading |
| Black text on #2588BD | 5.33:1 | AA | Lc 37.7 | Non-text elements, placeholder text |
| #2588BD text on white | 3.93:1 | AA large text | Lc 66.3 | Content text, not long reading |
| #2588BD text on black | 5.33:1 | AA | Lc -35.3 | 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
#F1F6FA
oklch(97.1% 0.008 241.7)
-
Step 100
100
#E0ECF4
oklch(93.6% 0.017 236.7)
-
Step 200
200
#C6DDEC
oklch(88.5% 0.032 236.4)
-
Step 300
300
#9EC7E2
oklch(80.9% 0.058 237.3)
-
Step 400
400
#66A9D4
oklch(70.7% 0.093 238.2)
-
Step 500
500 (this color)
#2588BD
oklch(59.6% 0.119 237.8)
-
Step 600
600
#007CB2
oklch(55.6% 0.123 237.7)
-
Step 700
700
#006896
oklch(49.1% 0.108 237.6)
-
Step 800
800
#00557C
oklch(42.7% 0.094 237.9)
-
Step 900
900
#0B4766
oklch(37.8% 0.078 237.8)
-
Step 950
950
#0A2A3B
oklch(27.1% 0.048 236)
#2588BD 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) | #6F88BF | 0.066 |
| Deuteranopia (no green cones) | #5A7ABC | 0.053 |
| Tritanopia (no blue cones) | #00969A | 0.078 |
| Achromatopsia (no color) | #808080 | 0.119 |
Harmonies
Hue rotations in OKLCH that keep this color's lightness and chroma.
Complementary
The opposite hue (180°).
- #2588BD
#2588BD
oklch(59.6% 0.119 237.8)
- #B36B2D
#B36B2D
oklch(59.6% 0.119 57.9)
Analogous
Neighbouring hues, 30° either side.
Split complementary
The two hues beside the complement (150° and 210°).
Triadic
Three hues spaced 120° apart.
Palettes with this color
Curated palettes that contain a color within ΔE 0.04 (OKLab) of #2588BD, closest first.
Similar named colors
The eight closest entries in our named color list, with their ΔE distance.
- Blue NCS #118AB2 ΔE 0.021
- Water Blue #0E87CC ΔE 0.025
- Cool Blue #4984B8 ΔE 0.025
- Steel Blue #4682B4 ΔE 0.026
- Off Blue #5684AE ΔE 0.040
- Nice Blue #107AB0 ΔE 0.045
- Dusty Blue #5A86AD ΔE 0.045
- Windows Blue #3778BF ΔE 0.046
Use #2588BD in your product
Turn it into light and dark UI roles checked for contrast, then export to Tailwind v4, shadcn/ui, CSS or design tokens.