#4288BD
Closest named color: Cool Blue (#4984B8). oklch(60.5% 0.107 243.8), rgb(66, 136, 189).
Aa
Black text reads best on this color (5.48:1).
About this color
#4288BD is a medium-dark, moderately saturated blue. In OKLCH its lightness is 60%, its chroma 0.107 and its hue 244°. Its hue sits on the cool side of the wheel. The nearest named color is Cool Blue (#4984B8), ΔE 0.012 away. Black text reads best on it, at 5.48:1.
| Hue family | Blues |
| Lightness | medium-dark (60%) |
| Chroma | moderately saturated (0.107) |
| Temperature | cool |
| Nearest name | Cool Blue (#4984B8) |
| Black text | 5.48:1 |
| White text | 3.82:1 |
Values
| HEX | #4288BD |
| RGB | rgb(66, 136, 189) |
| HSL | hsl(206, 48%, 50%) |
| OKLCH | oklch(60.5% 0.107 243.8) |
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 #4288BD | 3.82:1 | AA large text | Lc -71.0 | Content text, not long reading |
| Black text on #4288BD | 5.48:1 | AA | Lc 38.5 | Non-text elements, placeholder text |
| #4288BD text on white | 3.82:1 | AA large text | Lc 65.5 | Content text, not long reading |
| #4288BD text on black | 5.48:1 | AA | Lc -36.1 | 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
#F2F6FA
oklch(97.1% 0.007 247.9)
-
Step 100
100
#E2EBF3
oklch(93.6% 0.015 244.7)
-
Step 200
200
#CADCEB
oklch(88.6% 0.028 243.1)
-
Step 300
300
#A4C5E1
oklch(80.9% 0.053 244.1)
-
Step 400
400
#72A7D1
oklch(70.7% 0.083 243.2)
-
Step 500
500 (this color)
#4288BD
oklch(60.5% 0.107 243.8)
-
Step 600
600
#2979B2
oklch(55.5% 0.117 244.1)
-
Step 700
700
#1A6699
oklch(49.1% 0.108 243.7)
-
Step 800
800
#19537C
oklch(42.6% 0.09 244)
-
Step 900
900
#1C4564
oklch(37.7% 0.07 244.2)
-
Step 950
950
#12293A
oklch(27.1% 0.043 242.6)
#4288BD 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) | #7089BF | 0.049 |
| Deuteranopia (no green cones) | #607DBC | 0.040 |
| Tritanopia (no blue cones) | #00959A | 0.081 |
| Achromatopsia (no color) | #828282 | 0.107 |
Harmonies
Hue rotations in OKLCH that keep this color's lightness and chroma.
Complementary
The opposite hue (180°).
- #4288BD
#4288BD
oklch(60.5% 0.107 243.8)
- #AE7335
#AE7335
oklch(60.6% 0.107 64.5)
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 #4288BD, closest first.
Similar named colors
The eight closest entries in our named color list, with their ΔE distance.
- Cool Blue #4984B8 ΔE 0.012
- Steel Blue #4682B4 ΔE 0.019
- Off Blue #5684AE ΔE 0.027
- Dusty Blue #5A86AD ΔE 0.031
- Blue NCS #118AB2 ΔE 0.033
- Water Blue #0E87CC ΔE 0.034
- Faded Blue #658CBB ΔE 0.038
- Windows Blue #3778BF ΔE 0.049
Use #4288BD 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.