#518CEA
Closest named color: Dark Sky Blue (#448EE4). oklch(64.5% 0.154 259.3), rgb(81, 140, 234).
Aa
Black text reads best on this color (6.28:1).
About this color
#518CEA is a medium-light, vivid blue. In OKLCH its lightness is 64%, its chroma 0.154 and its hue 259°. Its hue sits on the cool side of the wheel. The nearest named color is Dark Sky Blue (#448EE4), ΔE 0.016 away. Black text reads best on it, at 6.28:1.
| Hue family | Blues |
| Lightness | medium-light (64%) |
| Chroma | vivid (0.154) |
| Temperature | cool |
| Nearest name | Dark Sky Blue (#448EE4) |
| Black text | 6.28:1 |
| White text | 3.33:1 |
Values
| HEX | #518CEA |
| RGB | rgb(81, 140, 234) |
| HSL | hsl(217, 78%, 62%) |
| OKLCH | oklch(64.5% 0.154 259.3) |
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 #518CEA | 3.33:1 | AA large text | Lc -66.0 | Content text, not long reading |
| Black text on #518CEA | 6.28:1 | AA | Lc 43.5 | Non-text elements, placeholder text |
| #518CEA text on white | 3.33:1 | AA large text | Lc 60.5 | Content text, not long reading |
| #518CEA text on black | 6.28:1 | AA | Lc -41.2 | 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
#F1F6FC
oklch(97.1% 0.01 252.8)
-
Step 100
100
#E1EBF9
oklch(93.7% 0.022 256.7)
-
Step 200
200
#C9DAF5
oklch(88.4% 0.042 259.6)
-
Step 300
300
#A4C2F2
oklch(80.9% 0.076 259.7)
-
Step 400
400
#72A1EB
oklch(70.6% 0.12 259.2)
-
Step 500
500 (this color)
#518CEA
oklch(64.5% 0.154 259.3)
-
Step 600
600
#306FD3
oklch(55.5% 0.167 259.4)
-
Step 700
700
#225CB7
oklch(49% 0.156 259.4)
-
Step 800
800
#1E4C94
oklch(42.7% 0.129 259.3)
-
Step 900
900
#1E4076
oklch(37.7% 0.101 259.3)
-
Step 950
950
#122645
oklch(27% 0.064 258.9)
#518CEA 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) | #6194EE | 0.029 |
| Deuteranopia (no green cones) | #4A86E8 | 0.018 |
| Tritanopia (no blue cones) | #00A2B0 | 0.126 |
| Achromatopsia (no color) | #8D8D8D | 0.154 |
Harmonies
Hue rotations in OKLCH that keep this color's lightness and chroma.
Complementary
The opposite hue (180°).
- #518CEA
#518CEA
oklch(64.5% 0.154 259.3)
- #B88200
#B88200
oklch(64.4% 0.134 79.3)
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 #518CEA, closest first.
Similar named colors
The eight closest entries in our named color list, with their ΔE distance.
- Dark Sky Blue #448EE4 ΔE 0.016
- Soft Blue #6488EA ΔE 0.020
- Chefchaouen Blue #4895EF ΔE 0.023
- Cornflower Blue #6495ED ΔE 0.033
- Dodger Blue #1E90FF ΔE 0.041
- Cornflower #6A79F7 ΔE 0.058
- Water Blue #0E87CC ΔE 0.064
- Clear Blue #247AFD ΔE 0.069
Use #518CEA 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.