#288AB5
Closest named color: Blue NCS (#118AB2). oklch(59.8% 0.109 232.2), rgb(40, 138, 181).
Aa
Black text reads best on this color (5.39:1).
About this color
#288AB5 is a medium-dark, moderately saturated blue. In OKLCH its lightness is 60%, its chroma 0.109 and its hue 232°. Its hue sits on the cool side of the wheel. The nearest named color is Blue NCS (#118AB2), ΔE 0.010 away. Black text reads best on it, at 5.39:1.
| Hue family | Blues |
| Lightness | medium-dark (60%) |
| Chroma | moderately saturated (0.109) |
| Temperature | cool |
| Nearest name | Blue NCS (#118AB2) |
| Black text | 5.39:1 |
| White text | 3.89:1 |
Values
| HEX | #288AB5 |
| RGB | rgb(40, 138, 181) |
| HSL | hsl(198, 64%, 43%) |
| OKLCH | oklch(59.8% 0.109 232.2) |
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 #288AB5 | 3.89:1 | AA large text | Lc -71.5 | Content text, not long reading |
| Black text on #288AB5 | 5.39:1 | AA | Lc 38.1 | Non-text elements, placeholder text |
| #288AB5 text on white | 3.89:1 | AA large text | Lc 66.0 | Content text, not long reading |
| #288AB5 text on black | 5.39:1 | AA | Lc -35.7 | 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
#E0ECF3
oklch(93.6% 0.016 233)
-
Step 200
200
#C7DDEA
oklch(88.5% 0.03 233.6)
-
Step 300
300
#9FC7DD
oklch(80.8% 0.053 232.3)
-
Step 400
400
#67AACD
oklch(70.7% 0.085 232.5)
-
Step 500
500 (this color)
#288AB5
oklch(59.8% 0.109 232.2)
-
Step 600
600
#007EAA
oklch(55.7% 0.113 231.8)
-
Step 700
700
#006A90
oklch(49.2% 0.1 232)
-
Step 800
800
#005676
oklch(42.6% 0.087 232.3)
-
Step 900
900
#0D4861
oklch(37.8% 0.071 232.1)
-
Step 950
950
#0B2A39
oklch(27% 0.045 233.1)
#288AB5 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) | #7488B7 | 0.070 |
| Deuteranopia (no green cones) | #627BB4 | 0.061 |
| Tritanopia (no blue cones) | #009698 | 0.067 |
| Achromatopsia (no color) | #818181 | 0.109 |
Harmonies
Hue rotations in OKLCH that keep this color's lightness and chroma.
Complementary
The opposite hue (180°).
- #288AB5
#288AB5
oklch(59.8% 0.109 232.2)
- #B26B3E
#B26B3E
oklch(59.7% 0.109 51.6)
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 #288AB5, closest first.
Similar named colors
The eight closest entries in our named color list, with their ΔE distance.
- Blue NCS #118AB2 ΔE 0.010
- Steel Blue #4682B4 ΔE 0.028
- Cool Blue #4984B8 ΔE 0.028
- Off Blue #5684AE ΔE 0.036
- Teal Blue #01889F ΔE 0.038
- Water Blue #0E87CC ΔE 0.039
- Dusty Blue #5A86AD ΔE 0.039
- Nice Blue #107AB0 ΔE 0.049
Use #288AB5 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.