#5183C8
Closest named color: Cool Blue (#4984B8). oklch(60.6% 0.119 256.7), rgb(81, 131, 200).
Aa
Black text reads best on this color (5.43:1).
About this color
#5183C8 is a medium-dark, moderately saturated blue. In OKLCH its lightness is 61%, its chroma 0.119 and its hue 257°. Its hue sits on the cool side of the wheel. The nearest named color is Cool Blue (#4984B8), ΔE 0.028 away. Black text reads best on it, at 5.43:1.
| Hue family | Blues |
| Lightness | medium-dark (61%) |
| Chroma | moderately saturated (0.119) |
| Temperature | cool |
| Nearest name | Cool Blue (#4984B8) |
| Black text | 5.43:1 |
| White text | 3.86:1 |
Values
| HEX | #5183C8 |
| RGB | rgb(81, 131, 200) |
| HSL | hsl(215, 52%, 55%) |
| OKLCH | oklch(60.6% 0.119 256.7) |
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 #5183C8 | 3.86:1 | AA large text | Lc -71.5 | Content text, not long reading |
| Black text on #5183C8 | 5.43:1 | AA | Lc 38.1 | Non-text elements, placeholder text |
| #5183C8 text on white | 3.86:1 | AA large text | Lc 66.0 | Content text, not long reading |
| #5183C8 text on black | 5.43:1 | 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
#F2F6FB
oklch(97.2% 0.008 253.9)
-
Step 100
100
#E3EBF5
oklch(93.7% 0.016 253.9)
-
Step 200
200
#CCDAEF
oklch(88.4% 0.033 258.4)
-
Step 300
300
#A9C3E6
oklch(81% 0.057 255.9)
-
Step 400
400
#7BA3DA
oklch(70.8% 0.092 256.5)
-
Step 500
500 (this color)
#5183C8
oklch(60.6% 0.119 256.7)
-
Step 600
600
#3D73BD
oklch(55.5% 0.129 256.8)
-
Step 700
700
#2F60A3
oklch(49% 0.12 256.9)
-
Step 800
800
#284F84
oklch(42.7% 0.099 256.7)
-
Step 900
900
#25426A
oklch(37.7% 0.077 256.8)
-
Step 950
950
#16273E
oklch(27% 0.049 256.3)
#5183C8 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) | #6688CB | 0.029 |
| Deuteranopia (no green cones) | #567CC7 | 0.019 |
| Tritanopia (no blue cones) | #00939C | 0.102 |
| Achromatopsia (no color) | #828282 | 0.119 |
Harmonies
Hue rotations in OKLCH that keep this color's lightness and chroma.
Complementary
The opposite hue (180°).
- #5183C8
#5183C8
oklch(60.6% 0.119 256.7)
- #AA771A
#AA771A
oklch(60.6% 0.119 76.5)
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 #5183C8, closest first.
Similar named colors
The eight closest entries in our named color list, with their ΔE distance.
- Cool Blue #4984B8 ΔE 0.028
- Steel Blue #4682B4 ΔE 0.034
- Water Blue #0E87CC ΔE 0.039
- Off Blue #5684AE ΔE 0.041
- Windows Blue #3778BF ΔE 0.043
- Faded Blue #658CBB ΔE 0.043
- Dusty Blue #5A86AD ΔE 0.045
- Dark Sky Blue #448EE4 ΔE 0.046
Use #5183C8 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.