#518BDB
Closest named color: Dark Sky Blue (#448EE4). oklch(63.4% 0.136 256.8), rgb(81, 139, 219).
Aa
Black text reads best on this color (6.06:1).
About this color
#518BDB is a medium-light, moderately saturated blue. In OKLCH its lightness is 63%, its chroma 0.136 and its hue 257°. Its hue sits on the cool side of the wheel. The nearest named color is Dark Sky Blue (#448EE4), ΔE 0.016 away. Black text reads best on it, at 6.06:1.
| Hue family | Blues |
| Lightness | medium-light (63%) |
| Chroma | moderately saturated (0.136) |
| Temperature | cool |
| Nearest name | Dark Sky Blue (#448EE4) |
| Black text | 6.06:1 |
| White text | 3.46:1 |
Values
| HEX | #518BDB |
| RGB | rgb(81, 139, 219) |
| HSL | hsl(215, 66%, 59%) |
| OKLCH | oklch(63.4% 0.136 256.8) |
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 #518BDB | 3.46:1 | AA large text | Lc -67.4 | Content text, not long reading |
| Black text on #518BDB | 6.06:1 | AA | Lc 42.1 | Non-text elements, placeholder text |
| #518BDB text on white | 3.46:1 | AA large text | Lc 61.9 | Content text, not long reading |
| #518BDB text on black | 6.06:1 | AA | Lc -39.8 | 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
#A6C3EC
oklch(81% 0.066 257)
-
Step 400
400
#75A3E2
oklch(70.8% 0.105 256.4)
-
Step 500
500 (this color)
#518BDB
oklch(63.4% 0.136 256.8)
-
Step 600
600
#3372C8
oklch(55.6% 0.148 257.1)
-
Step 700
700
#255FAC
oklch(49% 0.137 256.8)
-
Step 800
800
#214E8C
oklch(42.7% 0.114 257.2)
-
Step 900
900
#204270
oklch(37.8% 0.089 256.6)
-
Step 950
950
#132741
oklch(27% 0.055 255.7)
#518BDB 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) | #6891DE | 0.031 |
| Deuteranopia (no green cones) | #5584D9 | 0.018 |
| Tritanopia (no blue cones) | #009DA9 | 0.111 |
| Achromatopsia (no color) | #8A8A8A | 0.136 |
Harmonies
Hue rotations in OKLCH that keep this color's lightness and chroma.
Complementary
The opposite hue (180°).
- #518BDB
#518BDB
oklch(63.4% 0.136 256.8)
- #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 #518BDB, 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 0.033
- Chefchaouen Blue #4895EF ΔE 0.036
- Cornflower Blue #6495ED ΔE 0.042
- Water Blue #0E87CC ΔE 0.049
- Faded Blue #658CBB ΔE 0.053
- Cool Blue #4984B8 ΔE 0.055
- Dodger Blue #1E90FF ΔE 0.058
Use #518BDB 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.