#5188DF
Closest named color: Dark Sky Blue (#448EE4). oklch(63% 0.144 259.2), rgb(81, 136, 223).
Aa
Black text reads best on this color (5.93:1).
About this color
#5188DF is a medium-light, vivid blue. In OKLCH its lightness is 63%, its chroma 0.144 and its hue 259°. Its hue sits on the cool side of the wheel. The nearest named color is Dark Sky Blue (#448EE4), ΔE 0.018 away. Black text reads best on it, at 5.93:1.
| Hue family | Blues |
| Lightness | medium-light (63%) |
| Chroma | vivid (0.144) |
| Temperature | cool |
| Nearest name | Dark Sky Blue (#448EE4) |
| Black text | 5.93:1 |
| White text | 3.53:1 |
Values
| HEX | #5188DF |
| RGB | rgb(81, 136, 223) |
| HSL | hsl(217, 69%, 60%) |
| OKLCH | oklch(63% 0.144 259.2) |
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 #5188DF | 3.53:1 | AA large text | Lc -68.2 | Content text, not long reading |
| Black text on #5188DF | 5.93:1 | AA | Lc 41.4 | Non-text elements, placeholder text |
| #5188DF text on white | 3.53:1 | AA large text | Lc 62.7 | Content text, not long reading |
| #5188DF 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
#E2EAF8
oklch(93.5% 0.021 261.8)
-
Step 200
200
#CADAF4
oklch(88.4% 0.04 260.1)
-
Step 300
300
#A6C2EF
oklch(80.9% 0.071 259.8)
-
Step 400
400
#75A1E7
oklch(70.6% 0.114 259.4)
-
Step 500
500 (this color)
#5188DF
oklch(63% 0.144 259.2)
-
Step 600
600
#3570CD
oklch(55.5% 0.157 259.3)
-
Step 700
700
#285DB2
oklch(49% 0.147 259.6)
-
Step 800
800
#224D90
oklch(42.8% 0.121 259.1)
-
Step 900
900
#214173
oklch(37.8% 0.094 259)
-
Step 950
950
#142643
oklch(27% 0.059 259.5)
#5188DF 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) | #618FE2 | 0.027 |
| Deuteranopia (no green cones) | #4D82DD | 0.017 |
| Tritanopia (no blue cones) | #009CA9 | 0.119 |
| Achromatopsia (no color) | #888888 | 0.144 |
Harmonies
Hue rotations in OKLCH that keep this color's lightness and chroma.
Complementary
The opposite hue (180°).
- #5188DF
#5188DF
oklch(63% 0.144 259.2)
- #B37E00
#B37E00
oklch(63% 0.131 79.1)
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 #5188DF, closest first.
Similar named colors
The eight closest entries in our named color list, with their ΔE distance.
- Dark Sky Blue #448EE4 ΔE 0.018
- Soft Blue #6488EA ΔE 0.027
- Chefchaouen Blue #4895EF ΔE 0.038
- Cornflower Blue #6495ED ΔE 0.045
- Water Blue #0E87CC ΔE 0.051
- Dodger Blue #1E90FF ΔE 0.054
- Cool Blue #4984B8 ΔE 0.060
- Cornflower #6A79F7 ΔE 0.061
Use #5188DF 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.