#5187E4
Closest named color: Dark Sky Blue (#448EE4). oklch(63.1% 0.152 260.6), rgb(81, 135, 228).
Aa
Black text reads best on this color (5.93:1).
About this color
#5187E4 is a medium-light, vivid blue. In OKLCH its lightness is 63%, its chroma 0.152 and its hue 261°. Its hue sits on the cool side of the wheel. The nearest named color is Dark Sky Blue (#448EE4), ΔE 0.020 away. Black text reads best on it, at 5.93:1.
| Hue family | Blues |
| Lightness | medium-light (63%) |
| Chroma | vivid (0.152) |
| Temperature | cool |
| Nearest name | Dark Sky Blue (#448EE4) |
| Black text | 5.93:1 |
| White text | 3.53:1 |
Values
| HEX | #5187E4 |
| RGB | rgb(81, 135, 228) |
| HSL | hsl(218, 73%, 61%) |
| OKLCH | oklch(63.1% 0.152 260.6) |
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 #5187E4 | 3.53:1 | AA large text | Lc -68.2 | Content text, not long reading |
| Black text on #5187E4 | 5.93:1 | AA | Lc 41.4 | Non-text elements, placeholder text |
| #5187E4 text on white | 3.53:1 | AA large text | Lc 62.7 | Content text, not long reading |
| #5187E4 text on black | 5.93:1 | AA | Lc -39.0 | 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
#E2EAF9
oklch(93.5% 0.022 263.2)
-
Step 200
200
#CADAF5
oklch(88.5% 0.041 260.9)
-
Step 300
300
#A5C2F1
oklch(80.9% 0.074 260)
-
Step 400
400
#75A1EA
oklch(70.7% 0.118 260.2)
-
Step 500
500 (this color)
#5187E4
oklch(63.1% 0.152 260.6)
-
Step 600
600
#356FD2
oklch(55.6% 0.165 260.4)
-
Step 700
700
#285CB6
oklch(49.1% 0.153 260.6)
-
Step 800
800
#224C93
oklch(42.8% 0.126 260.2)
-
Step 900
900
#214075
oklch(37.7% 0.098 260.4)
-
Step 950
950
#142645
oklch(27.1% 0.063 260.6)
#5187E4 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) | #5D90E8 | 0.029 |
| Deuteranopia (no green cones) | #4682E2 | 0.018 |
| Tritanopia (no blue cones) | #009CAA | 0.125 |
| Achromatopsia (no color) | #888888 | 0.152 |
Harmonies
Hue rotations in OKLCH that keep this color's lightness and chroma.
Complementary
The opposite hue (180°).
- #5187E4
#5187E4
oklch(63.1% 0.152 260.6)
- #B27F00
#B27F00
oklch(63.1% 0.131 80.3)
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 #5187E4, closest first.
Similar named colors
The eight closest entries in our named color list, with their ΔE distance.
- Dark Sky Blue #448EE4 ΔE 0.020
- Soft Blue #6488EA ΔE 0.023
- Chefchaouen Blue #4895EF ΔE 0.037
- Cornflower Blue #6495ED ΔE 0.045
- Dodger Blue #1E90FF ΔE 0.049
- Cornflower #6A79F7 ΔE 0.054
- Water Blue #0E87CC ΔE 0.057
- Clear Blue #247AFD ΔE 0.065
Use #5187E4 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.