#518DDF
Closest named color: Dark Sky Blue (#448EE4). oklch(64.1% 0.139 256.7), rgb(81, 141, 223).
Aa
Black text reads best on this color (6.22:1).
About this color
#518DDF is a medium-light, moderately saturated blue. In OKLCH its lightness is 64%, its chroma 0.139 and its hue 257°. Its hue sits on the cool side of the wheel. The nearest named color is Dark Sky Blue (#448EE4), ΔE 0.012 away. Black text reads best on it, at 6.22:1.
| Hue family | Blues |
| Lightness | medium-light (64%) |
| Chroma | moderately saturated (0.139) |
| Temperature | cool |
| Nearest name | Dark Sky Blue (#448EE4) |
| Black text | 6.22:1 |
| White text | 3.37:1 |
Values
| HEX | #518DDF |
| RGB | rgb(81, 141, 223) |
| HSL | hsl(215, 69%, 60%) |
| OKLCH | oklch(64.1% 0.139 256.7) |
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 #518DDF | 3.37:1 | AA large text | Lc -66.4 | Content text, not long reading |
| Black text on #518DDF | 6.22:1 | AA | Lc 43.1 | Non-text elements, placeholder text |
| #518DDF text on white | 3.37:1 | AA large text | Lc 61.0 | Content text, not long reading |
| #518DDF text on black | 6.22:1 | AA | Lc -40.7 | 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
#E2EBF7
oklch(93.7% 0.019 255.5)
-
Step 200
200
#CADBF2
oklch(88.6% 0.037 256)
-
Step 300
300
#A5C3ED
oklch(81% 0.068 256.8)
-
Step 400
400
#74A3E4
oklch(70.8% 0.108 256.7)
-
Step 500
500 (this color)
#518DDF
oklch(64.1% 0.139 256.7)
-
Step 600
600
#3072C9
oklch(55.5% 0.151 256.6)
-
Step 700
700
#235FAE
oklch(49% 0.14 256.8)
-
Step 800
800
#1F4E8D
oklch(42.7% 0.116 256.9)
-
Step 900
900
#1F4271
oklch(37.9% 0.09 256.5)
-
Step 950
950
#132742
oklch(27.1% 0.057 256.4)
#518DDF 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) | #6993E2 | 0.032 |
| Deuteranopia (no green cones) | #5586DD | 0.018 |
| Tritanopia (no blue cones) | #00A0AB | 0.114 |
| Achromatopsia (no color) | #8C8C8C | 0.139 |
Harmonies
Hue rotations in OKLCH that keep this color's lightness and chroma.
Complementary
The opposite hue (180°).
- #518DDF
#518DDF
oklch(64.1% 0.139 256.7)
- #BA7F00
#BA7F00
oklch(64% 0.134 76.2)
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 #518DDF, closest first.
Similar named colors
The eight closest entries in our named color list, with their ΔE distance.
- Dark Sky Blue #448EE4 ΔE 0.012
- Chefchaouen Blue #4895EF ΔE 0.029
- Soft Blue #6488EA ΔE 0.030
- Cornflower Blue #6495ED ΔE 0.036
- Dodger Blue #1E90FF ΔE 0.053
- Water Blue #0E87CC ΔE 0.054
- Faded Blue #658CBB ΔE 0.056
- Cool Blue #4984B8 ΔE 0.062
Use #518DDF 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.