#518ADE
Closest named color: Dark Sky Blue (#448EE4). oklch(63.4% 0.141 258), rgb(81, 138, 222).
Aa
Black text reads best on this color (6.04:1).
About this color
#518ADE is a medium-light, vivid blue. In OKLCH its lightness is 63%, its chroma 0.141 and its hue 258°. 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 6.04:1.
| Hue family | Blues |
| Lightness | medium-light (63%) |
| Chroma | vivid (0.141) |
| Temperature | cool |
| Nearest name | Dark Sky Blue (#448EE4) |
| Black text | 6.04:1 |
| White text | 3.47:1 |
Values
| HEX | #518ADE |
| RGB | rgb(81, 138, 222) |
| HSL | hsl(216, 68%, 59%) |
| OKLCH | oklch(63.4% 0.141 258) |
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 #518ADE | 3.47:1 | AA large text | Lc -67.5 | Content text, not long reading |
| Black text on #518ADE | 6.04:1 | AA | Lc 42.0 | Non-text elements, placeholder text |
| #518ADE text on white | 3.47:1 | AA large text | Lc 62.1 | Content text, not long reading |
| #518ADE text on black | 6.04:1 | AA | Lc -39.6 | 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
#E2EBF8
oklch(93.7% 0.02 257.5)
-
Step 200
200
#CADAF3
oklch(88.4% 0.039 259.3)
-
Step 300
300
#A5C3ED
oklch(81% 0.068 256.8)
-
Step 400
400
#75A2E5
oklch(70.7% 0.11 258.1)
-
Step 500
500 (this color)
#518ADE
oklch(63.4% 0.141 258)
-
Step 600
600
#3371CB
oklch(55.5% 0.154 258.1)
-
Step 700
700
#265EAF
oklch(49% 0.142 258.1)
-
Step 800
800
#214D8E
oklch(42.6% 0.118 258.3)
-
Step 900
900
#204171
oklch(37.7% 0.091 257.9)
-
Step 950
950
#132642
oklch(26.8% 0.058 258)
#518ADE 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) | #6591E1 | 0.030 |
| Deuteranopia (no green cones) | #5183DC | 0.019 |
| Tritanopia (no blue cones) | #009DA9 | 0.116 |
| Achromatopsia (no color) | #898989 | 0.141 |
Harmonies
Hue rotations in OKLCH that keep this color's lightness and chroma.
Complementary
The opposite hue (180°).
- #518ADE
#518ADE
oklch(63.4% 0.141 258)
- #B57E00
#B57E00
oklch(63.3% 0.132 78)
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 #518ADE, 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 0.028
- Chefchaouen Blue #4895EF ΔE 0.035
- Cornflower Blue #6495ED ΔE 0.042
- Water Blue #0E87CC ΔE 0.051
- Dodger Blue #1E90FF ΔE 0.055
- Faded Blue #658CBB ΔE 0.058
- Cool Blue #4984B8 ΔE 0.059
Use #518ADE 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.