#288DB6
Closest named color: Blue NCS (#118AB2). oklch(60.5% 0.108 230.2), rgb(40, 141, 182).
Aa
Black text reads best on this color (5.57:1).
About this color
#288DB6 is a medium-dark, moderately saturated blue. In OKLCH its lightness is 61%, its chroma 0.108 and its hue 230°. Its hue sits on the cool side of the wheel. The nearest named color is Blue NCS (#118AB2), ΔE 0.014 away. Black text reads best on it, at 5.57:1.
| Hue family | Blues |
| Lightness | medium-dark (61%) |
| Chroma | moderately saturated (0.108) |
| Temperature | cool |
| Nearest name | Blue NCS (#118AB2) |
| Black text | 5.57:1 |
| White text | 3.76:1 |
Values
| HEX | #288DB6 |
| RGB | rgb(40, 141, 182) |
| HSL | hsl(197, 64%, 44%) |
| OKLCH | oklch(60.5% 0.108 230.2) |
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 #288DB6 | 3.76:1 | AA large text | Lc -70.3 | Content text, not long reading |
| Black text on #288DB6 | 5.57:1 | AA | Lc 39.2 | Non-text elements, placeholder text |
| #288DB6 text on white | 3.76:1 | AA large text | Lc 64.8 | Content text, not long reading |
| #288DB6 text on black | 5.57:1 | AA | Lc -36.8 | 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
#F1F6F9
oklch(97% 0.007 233.6)
-
Step 100
100
#E0ECF2
oklch(93.6% 0.015 229)
-
Step 200
200
#C6DDE9
oklch(88.4% 0.03 230.3)
-
Step 300
300
#9EC8DD
oklch(81% 0.053 229.8)
-
Step 400
400
#66ABCB
oklch(70.8% 0.084 229.5)
-
Step 500
500 (this color)
#288DB6
oklch(60.5% 0.108 230.2)
-
Step 600
600
#007EA8
oklch(55.6% 0.112 230.6)
-
Step 700
700
#006A8D
oklch(49.1% 0.098 229.8)
-
Step 800
800
#005775
oklch(42.8% 0.086 230.3)
-
Step 900
900
#0A4860
oklch(37.7% 0.071 230.4)
-
Step 950
950
#0A2A38
oklch(26.9% 0.045 230.7)
#288DB6 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) | #788BB8 | 0.074 |
| Deuteranopia (no green cones) | #657EB5 | 0.062 |
| Tritanopia (no blue cones) | #00989B | 0.062 |
| Achromatopsia (no color) | #838383 | 0.108 |
Harmonies
Hue rotations in OKLCH that keep this color's lightness and chroma.
Complementary
The opposite hue (180°).
- #288DB6
#288DB6
oklch(60.5% 0.108 230.2)
- #B56D43
#B56D43
oklch(60.5% 0.108 49.9)
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 #288DB6, closest first.
Similar named colors
The eight closest entries in our named color list, with their ΔE distance.
- Blue NCS #118AB2 ΔE 0.014
- Cool Blue #4984B8 ΔE 0.033
- Steel Blue #4682B4 ΔE 0.034
- Off Blue #5684AE ΔE 0.039
- Teal Blue #01889F ΔE 0.040
- Dusty Blue #5A86AD ΔE 0.040
- Water Blue #0E87CC ΔE 0.043
- Faded Blue #658CBB ΔE 0.052
Use #288DB6 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.