#5187CE
Closest named color: Dark Sky Blue (#448EE4). oklch(61.8% 0.123 255.8), rgb(81, 135, 206).
Aa
Black text reads best on this color (5.70:1).
About this color
#5187CE is a medium-dark, moderately saturated blue. In OKLCH its lightness is 62%, its chroma 0.123 and its hue 256°. Its hue sits on the cool side of the wheel. The nearest named color is Dark Sky Blue (#448EE4), ΔE 0.035 away. Black text reads best on it, at 5.70:1.
| Hue family | Blues |
| Lightness | medium-dark (62%) |
| Chroma | moderately saturated (0.123) |
| Temperature | cool |
| Nearest name | Dark Sky Blue (#448EE4) |
| Black text | 5.70:1 |
| White text | 3.67:1 |
Values
| HEX | #5187CE |
| RGB | rgb(81, 135, 206) |
| HSL | hsl(214, 56%, 56%) |
| OKLCH | oklch(61.8% 0.123 255.8) |
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 #5187CE | 3.67:1 | AA large text | Lc -69.7 | Content text, not long reading |
| Black text on #5187CE | 5.70:1 | AA | Lc 39.9 | Non-text elements, placeholder text |
| #5187CE text on white | 3.67:1 | AA large text | Lc 64.2 | Content text, not long reading |
| #5187CE text on black | 5.70:1 | AA | Lc -37.5 | 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
#F2F6FB
oklch(97.2% 0.008 253.9)
-
Step 100
100
#E2EBF6
oklch(93.7% 0.018 253.3)
-
Step 200
200
#CBDBEF
oklch(88.6% 0.033 254)
-
Step 300
300
#A8C3E8
oklch(81% 0.06 256.3)
-
Step 400
400
#78A3DC
oklch(70.7% 0.096 255.7)
-
Step 500
500 (this color)
#5187CE
oklch(61.8% 0.123 255.8)
-
Step 600
600
#3974BF
oklch(55.7% 0.132 255.6)
-
Step 700
700
#2B61A5
oklch(49.2% 0.123 255.6)
-
Step 800
800
#254F86
oklch(42.7% 0.103 256.1)
-
Step 900
900
#23426B
oklch(37.7% 0.08 256.1)
-
Step 950
950
#15273F
oklch(27% 0.051 256.1)
#5187CE 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) | #698CD1 | 0.031 |
| Deuteranopia (no green cones) | #5880CD | 0.019 |
| Tritanopia (no blue cones) | #0097A1 | 0.102 |
| Achromatopsia (no color) | #858585 | 0.123 |
Harmonies
Hue rotations in OKLCH that keep this color's lightness and chroma.
Complementary
The opposite hue (180°).
- #5187CE
#5187CE
oklch(61.8% 0.123 255.8)
- #AF7A18
#AF7A18
oklch(61.8% 0.123 76.4)
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 #5187CE, closest first.
Similar named colors
The eight closest entries in our named color list, with their ΔE distance.
- Dark Sky Blue #448EE4 ΔE 0.035
- Cool Blue #4984B8 ΔE 0.035
- Water Blue #0E87CC ΔE 0.040
- Faded Blue #658CBB ΔE 0.041
- Steel Blue #4682B4 ΔE 0.043
- Off Blue #5684AE ΔE 0.048
- Soft Blue #6488EA ΔE 0.048
- Dusty Blue #5A86AD ΔE 0.051
Use #5187CE 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.