#518BDD
Closest named color: Dark Sky Blue (#448EE4). oklch(63.5% 0.138 257.3), rgb(81, 139, 221).
Aa
Black text reads best on this color (6.08:1).
About this color
#518BDD is a medium-light, moderately saturated blue. In OKLCH its lightness is 64%, its chroma 0.138 and its hue 257°. Its hue sits on the cool side of the wheel. The nearest named color is Dark Sky Blue (#448EE4), ΔE 0.015 away. Black text reads best on it, at 6.08:1.
| Hue family | Blues |
| Lightness | medium-light (64%) |
| Chroma | moderately saturated (0.138) |
| Temperature | cool |
| Nearest name | Dark Sky Blue (#448EE4) |
| Black text | 6.08:1 |
| White text | 3.44:1 |
Values
| HEX | #518BDD |
| RGB | rgb(81, 139, 221) |
| HSL | hsl(215, 67%, 59%) |
| OKLCH | oklch(63.5% 0.138 257.3) |
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 #518BDD | 3.44:1 | AA large text | Lc -67.3 | Content text, not long reading |
| Black text on #518BDD | 6.08:1 | AA | Lc 42.3 | Non-text elements, placeholder text |
| #518BDD text on white | 3.44:1 | AA large text | Lc 61.8 | Content text, not long reading |
| #518BDD text on black | 6.08:1 | AA | Lc -39.9 | 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
#75A2E4
oklch(70.7% 0.109 257.8)
-
Step 500
500 (this color)
#518BDD
oklch(63.5% 0.138 257.3)
-
Step 600
600
#3372C9
oklch(55.6% 0.15 257.3)
-
Step 700
700
#255FAE
oklch(49.1% 0.14 257.3)
-
Step 800
800
#204E8D
oklch(42.7% 0.116 257.2)
-
Step 900
900
#204171
oklch(37.7% 0.091 257.9)
-
Step 950
950
#132742
oklch(27.1% 0.057 256.4)
#518BDD 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) | #6791E0 | 0.030 |
| Deuteranopia (no green cones) | #5484DB | 0.018 |
| Tritanopia (no blue cones) | #009EA9 | 0.115 |
| Achromatopsia (no color) | #8A8A8A | 0.138 |
Harmonies
Hue rotations in OKLCH that keep this color's lightness and chroma.
Complementary
The opposite hue (180°).
- #518BDD
#518BDD
oklch(63.5% 0.138 257.3)
- #B77E00
#B77E00
oklch(63.5% 0.133 77)
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 #518BDD, closest first.
Similar named colors
The eight closest entries in our named color list, with their ΔE distance.
- Dark Sky Blue #448EE4 ΔE 0.015
- Soft Blue #6488EA ΔE 0.030
- Chefchaouen Blue #4895EF ΔE 0.034
- Cornflower Blue #6495ED ΔE 0.041
- Water Blue #0E87CC ΔE 0.051
- Faded Blue #658CBB ΔE 0.055
- Dodger Blue #1E90FF ΔE 0.056
- Cool Blue #4984B8 ΔE 0.058
Use #518BDD 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.