#518FCF
Closest named color: Faded Blue (#658CBB). oklch(63.6% 0.116 250.8), rgb(81, 143, 207).
Aa
Black text reads best on this color (6.17:1).
About this color
#518FCF is a medium-light, moderately saturated blue. In OKLCH its lightness is 64%, its chroma 0.116 and its hue 251°. Its hue sits on the cool side of the wheel. The nearest named color is Faded Blue (#658CBB), ΔE 0.034 away. Black text reads best on it, at 6.17:1.
| Hue family | Blues |
| Lightness | medium-light (64%) |
| Chroma | moderately saturated (0.116) |
| Temperature | cool |
| Nearest name | Faded Blue (#658CBB) |
| Black text | 6.17:1 |
| White text | 3.39:1 |
Values
| HEX | #518FCF |
| RGB | rgb(81, 143, 207) |
| HSL | hsl(210, 57%, 56%) |
| OKLCH | oklch(63.6% 0.116 250.8) |
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 #518FCF | 3.39:1 | AA large text | Lc -66.7 | Content text, not long reading |
| Black text on #518FCF | 6.17:1 | AA | Lc 42.8 | Non-text elements, placeholder text |
| #518FCF text on white | 3.39:1 | AA large text | Lc 61.3 | Content text, not long reading |
| #518FCF text on black | 6.17:1 | AA | Lc -40.4 | 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
#F2F6FA
oklch(97.1% 0.007 247.9)
-
Step 100
100
#E2EBF5
oklch(93.6% 0.017 250.8)
-
Step 200
200
#CADBEE
oklch(88.5% 0.032 251.1)
-
Step 300
300
#A6C4E5
oklch(80.9% 0.057 251)
-
Step 400
400
#75A5D8
oklch(70.8% 0.091 250.7)
-
Step 500
500 (this color)
#518FCF
oklch(63.6% 0.116 250.8)
-
Step 600
600
#3176BA
oklch(55.5% 0.127 250.9)
-
Step 700
700
#2363A0
oklch(49.1% 0.117 250.7)
-
Step 800
800
#1F5182
oklch(42.7% 0.097 250.8)
-
Step 900
900
#1F4468
oklch(37.8% 0.075 249.9)
-
Step 950
950
#13283D
oklch(27.1% 0.048 250)
#518FCF 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) | #7492D2 | 0.040 |
| Deuteranopia (no green cones) | #6386CE | 0.028 |
| Tritanopia (no blue cones) | #009EA6 | 0.095 |
| Achromatopsia (no color) | #8B8B8B | 0.116 |
Harmonies
Hue rotations in OKLCH that keep this color's lightness and chroma.
Complementary
The opposite hue (180°).
- #518FCF
#518FCF
oklch(63.6% 0.116 250.8)
- #B77E2F
#B77E2F
oklch(63.7% 0.117 71.3)
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 #518FCF, closest first.
Similar named colors
The eight closest entries in our named color list, with their ΔE distance.
- Faded Blue #658CBB ΔE 0.034
- Dark Sky Blue #448EE4 ΔE 0.034
- Cool Blue #4984B8 ΔE 0.044
- Chefchaouen Blue #4895EF ΔE 0.047
- Water Blue #0E87CC ΔE 0.048
- Cornflower Blue #6495ED ΔE 0.051
- Dusty Blue #5A86AD ΔE 0.052
- Steel Blue #4682B4 ΔE 0.052
Use #518FCF 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.