#4B81BC
Closest named color: Cool Blue (#4984B8). oklch(59.2% 0.108 252), rgb(75, 129, 188).
Aa
Black text reads best on this color (5.16:1).
About this color
#4B81BC is a medium-dark, moderately saturated blue. In OKLCH its lightness is 59%, its chroma 0.108 and its hue 252°. 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 5.16:1.
| Hue family | Blues |
| Lightness | medium-dark (59%) |
| Chroma | moderately saturated (0.108) |
| Temperature | cool |
| Nearest name | Cool Blue (#4984B8) |
| Black text | 5.16:1 |
| White text | 4.06:1 |
Values
| HEX | #4B81BC |
| RGB | rgb(75, 129, 188) |
| HSL | hsl(211, 46%, 52%) |
| OKLCH | oklch(59.2% 0.108 252) |
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 #4B81BC | 4.06:1 | AA large text | Lc -73.2 | Content text, not long reading |
| Black text on #4B81BC | 5.16:1 | AA | Lc 36.4 | Non-text elements, placeholder text |
| #4B81BC text on white | 4.06:1 | AA large text | Lc 67.7 | Content text, not long reading |
| #4B81BC text on black | 5.16:1 | AA | Lc -34.0 | 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 600.
-
Step 50
50
#F2F6FA
oklch(97.1% 0.007 247.9)
-
Step 100
100
#E3EBF3
oklch(93.6% 0.014 248)
-
Step 200
200
#CDDBEB
oklch(88.6% 0.027 251.7)
-
Step 300
300
#ABC3E0
oklch(80.9% 0.049 253.3)
-
Step 400
400
#7DA4D0
oklch(70.7% 0.078 251.9)
-
Step 500
500
#5B8DC4
oklch(63.1% 0.099 251.8)
-
Step 600
600 (this color)
#4B81BC
oklch(59.2% 0.108 252)
-
Step 700
700
#326398
oklch(49.1% 0.101 252.2)
-
Step 800
800
#2A517B
oklch(42.7% 0.083 251.9)
-
Step 900
900
#274363
oklch(37.6% 0.065 252.8)
-
Step 950
950
#17283A
oklch(27.1% 0.041 250.8)
#4B81BC 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) | #6884BF | 0.035 |
| Deuteranopia (no green cones) | #5979BB | 0.025 |
| Tritanopia (no blue cones) | #008F96 | 0.090 |
| Achromatopsia (no color) | #7E7E7E | 0.108 |
Harmonies
Hue rotations in OKLCH that keep this color's lightness and chroma.
Complementary
The opposite hue (180°).
- #4B81BC
#4B81BC
oklch(59.2% 0.108 252)
- #A5722A
#A5722A
oklch(59.2% 0.108 71.9)
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 #4B81BC, 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 0.015
- Off Blue #5684AE ΔE 0.028
- Dusty Blue #5A86AD ΔE 0.034
- Windows Blue #3778BF ΔE 0.034
- Water Blue #0E87CC ΔE 0.039
- Faded Blue #658CBB ΔE 0.045
- Blue NCS #118AB2 ΔE 0.046
Use #4B81BC 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.