#5181D3
Closest named color: Dark Sky Blue (#448EE4). oklch(60.8% 0.136 260.5), rgb(81, 129, 211).
Aa
Black text reads best on this color (5.43:1).
About this color
#5181D3 is a medium-dark, moderately saturated blue. In OKLCH its lightness is 61%, its chroma 0.136 and its hue 260°. Its hue sits on the cool side of the wheel. The nearest named color is Dark Sky Blue (#448EE4), ΔE 0.039 away. Black text reads best on it, at 5.43:1.
| Hue family | Blues |
| Lightness | medium-dark (61%) |
| Chroma | moderately saturated (0.136) |
| Temperature | cool |
| Nearest name | Dark Sky Blue (#448EE4) |
| Black text | 5.43:1 |
| White text | 3.86:1 |
Values
| HEX | #5181D3 |
| RGB | rgb(81, 129, 211) |
| HSL | hsl(218, 60%, 57%) |
| OKLCH | oklch(60.8% 0.136 260.5) |
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 #5181D3 | 3.86:1 | AA large text | Lc -71.4 | Content text, not long reading |
| Black text on #5181D3 | 5.43:1 | AA | Lc 38.2 | Non-text elements, placeholder text |
| #5181D3 text on white | 3.86:1 | AA large text | Lc 65.9 | Content text, not long reading |
| #5181D3 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
#F2F6FC
oklch(97.2% 0.009 258.3)
-
Step 100
100
#E3EAF7
oklch(93.6% 0.019 263)
-
Step 200
200
#CBDAF2
oklch(88.5% 0.037 259.8)
-
Step 300
300
#A8C2EC
oklch(80.9% 0.066 259.9)
-
Step 400
400
#7AA1E3
oklch(70.7% 0.106 260.6)
-
Step 500
500 (this color)
#5181D3
oklch(60.8% 0.136 260.5)
-
Step 600
600
#3D70C8
oklch(55.5% 0.147 260.5)
-
Step 700
700
#2F5EAD
oklch(49.2% 0.136 260.1)
-
Step 800
800
#284D8C
oklch(42.7% 0.113 260.3)
-
Step 900
900
#254070
oklch(37.6% 0.089 261.1)
-
Step 950
950
#162642
oklch(27% 0.057 260.9)
#5181D3 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) | #5D88D6 | 0.024 |
| Deuteranopia (no green cones) | #4B7CD1 | 0.016 |
| Tritanopia (no blue cones) | #0094A0 | 0.115 |
| Achromatopsia (no color) | #828282 | 0.136 |
Harmonies
Hue rotations in OKLCH that keep this color's lightness and chroma.
Complementary
The opposite hue (180°).
- #5181D3
#5181D3
oklch(60.8% 0.136 260.5)
- #A97900
#A97900
oklch(60.8% 0.126 80.8)
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 #5181D3, closest first.
Similar named colors
The eight closest entries in our named color list, with their ΔE distance.
- Dark Sky Blue #448EE4 ΔE 0.039
- Water Blue #0E87CC ΔE 0.044
- Soft Blue #6488EA ΔE 0.045
- Cool Blue #4984B8 ΔE 0.046
- Windows Blue #3778BF ΔE 0.047
- Steel Blue #4682B4 ΔE 0.051
- Faded Blue #658CBB ΔE 0.058
- Off Blue #5684AE ΔE 0.060
Use #5181D3 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.