#5183A5
Closest named color: Off Blue (#5684AE). oklch(58.8% 0.075 239.5), rgb(81, 131, 165).
Aa
Black text reads best on this color (5.13:1).
About this color
#5183A5 is a medium-dark, moderately saturated blue. In OKLCH its lightness is 59%, its chroma 0.075 and its hue 240°. Its hue sits on the cool side of the wheel. The nearest named color is Off Blue (#5684AE), ΔE 0.015 away. Black text reads best on it, at 5.13:1.
| Hue family | Blues |
| Lightness | medium-dark (59%) |
| Chroma | moderately saturated (0.075) |
| Temperature | cool |
| Nearest name | Off Blue (#5684AE) |
| Black text | 5.13:1 |
| White text | 4.08:1 |
Values
| HEX | #5183A5 |
| RGB | rgb(81, 131, 165) |
| HSL | hsl(204, 34%, 48%) |
| OKLCH | oklch(58.8% 0.075 239.5) |
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 #5183A5 | 4.08:1 | AA large text | Lc -73.4 | Content text, not long reading |
| Black text on #5183A5 | 5.13:1 | AA | Lc 36.2 | Non-text elements, placeholder text |
| #5183A5 text on white | 4.08:1 | AA large text | Lc 67.9 | Content text, not long reading |
| #5183A5 text on black | 5.13:1 | AA | Lc -33.7 | 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 600.
-
Step 50
50
#F3F6F8
oklch(97.1% 0.004 236.5)
-
Step 100
100
#E4EBF0
oklch(93.6% 0.01 238.5)
-
Step 200
200
#CEDBE4
oklch(88.4% 0.019 237.8)
-
Step 300
300
#AEC4D5
oklch(80.9% 0.034 241.2)
-
Step 400
400
#82A6BF
oklch(70.7% 0.054 238.8)
-
Step 500
500
#6290AF
oklch(63.2% 0.068 238.8)
-
Step 600
600 (this color)
#5183A5
oklch(58.8% 0.075 239.5)
-
Step 700
700
#396684
oklch(49.1% 0.069 239.5)
-
Step 800
800
#2F536B
oklch(42.6% 0.058 239.3)
-
Step 900
900
#2A4557
oklch(37.7% 0.045 238.8)
-
Step 950
950
#192833
oklch(26.9% 0.029 241)
#5183A5 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) | #7483A7 | 0.043 |
| Deuteranopia (no green cones) | #687AA4 | 0.035 |
| Tritanopia (no blue cones) | #258C8E | 0.062 |
| Achromatopsia (no color) | #7E7E7E | 0.075 |
Harmonies
Hue rotations in OKLCH that keep this color's lightness and chroma.
Complementary
The opposite hue (180°).
- #5183A5
#5183A5
oklch(58.8% 0.075 239.5)
- #9E724E
#9E724E
oklch(58.8% 0.075 59.9)
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 #5183A5, closest first.
Similar named colors
The eight closest entries in our named color list, with their ΔE distance.
- Off Blue #5684AE ΔE 0.015
- Dusty Blue #5A86AD ΔE 0.018
- Stormy Blue #507B9C ΔE 0.024
- Steel Blue #4682B4 ΔE 0.026
- Cerulean #457B9D ΔE 0.029
- Cool Blue #4984B8 ΔE 0.029
- Grey Blue #647D8E ΔE 0.038
- Blue NCS #118AB2 ΔE 0.041
Use #5183A5 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.