#278EDE
Closest named color: Dark Sky Blue (#448EE4). oklch(62.9% 0.15 247.4), rgb(39, 142, 222).
Aa
Black text reads best on this color (6.01:1).
About this color
#278EDE is a medium-light, vivid blue. In OKLCH its lightness is 63%, its chroma 0.150 and its hue 247°. Its hue sits on the cool side of the wheel. The nearest named color is Dark Sky Blue (#448EE4), ΔE 0.021 away. Black text reads best on it, at 6.01:1.
| Hue family | Blues |
| Lightness | medium-light (63%) |
| Chroma | vivid (0.150) |
| Temperature | cool |
| Nearest name | Dark Sky Blue (#448EE4) |
| Black text | 6.01:1 |
| White text | 3.49:1 |
Values
| HEX | #278EDE |
| RGB | rgb(39, 142, 222) |
| HSL | hsl(206, 73%, 51%) |
| OKLCH | oklch(62.9% 0.15 247.4) |
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 #278EDE | 3.49:1 | AA large text | Lc -67.5 | Content text, not long reading |
| Black text on #278EDE | 6.01:1 | AA | Lc 42.0 | Non-text elements, placeholder text |
| #278EDE text on white | 3.49:1 | AA large text | Lc 62.0 | Content text, not long reading |
| #278EDE text on black | 6.01:1 | AA | Lc -39.7 | 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
#F0F6FC
oklch(97% 0.01 247.9)
-
Step 100
100
#DFECF8
oklch(93.7% 0.021 245.9)
-
Step 200
200
#C4DCF3
oklch(88.4% 0.041 247.1)
-
Step 300
300
#9BC6EE
oklch(81% 0.073 246.9)
-
Step 400
400
#60A7E6
oklch(70.8% 0.117 247.1)
-
Step 500
500 (this color)
#278EDE
oklch(62.9% 0.15 247.4)
-
Step 600
600
#0077C4
oklch(55.5% 0.148 247.6)
-
Step 700
700
#0064A6
oklch(49.1% 0.131 247.6)
-
Step 800
800
#005289
oklch(42.7% 0.113 247.3)
-
Step 900
900
#034472
oklch(37.6% 0.098 247.4)
-
Step 950
950
#072843
oklch(26.9% 0.063 247.7)
#278EDE 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) | #6892E1 | 0.055 |
| Deuteranopia (no green cones) | #4D82DC | 0.037 |
| Tritanopia (no blue cones) | #00A1AB | 0.107 |
| Achromatopsia (no color) | #898989 | 0.150 |
Harmonies
Hue rotations in OKLCH that keep this color's lightness and chroma.
Complementary
The opposite hue (180°).
- #278EDE
#278EDE
oklch(62.9% 0.15 247.4)
- #BF7600
#BF7600
oklch(63% 0.138 67.7)
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 #278EDE, closest first.
Similar named colors
The eight closest entries in our named color list, with their ΔE distance.
- Dark Sky Blue #448EE4 ΔE 0.021
- Water Blue #0E87CC ΔE 0.034
- Chefchaouen Blue #4895EF ΔE 0.039
- Dodger Blue #1E90FF ΔE 0.049
- Soft Blue #6488EA ΔE 0.054
- Cornflower Blue #6495ED ΔE 0.059
- Cool Blue #4984B8 ΔE 0.059
- Steel Blue #4682B4 ΔE 0.066
Use #278EDE 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.