#278EE2
Closest named color: Dark Sky Blue (#448EE4). oklch(63.1% 0.155 248.5), rgb(39, 142, 226).
Aa
Black text reads best on this color (6.05:1).
About this color
#278EE2 is a medium-light, vivid blue. In OKLCH its lightness is 63%, its chroma 0.155 and its hue 249°. 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 6.05:1.
| Hue family | Blues |
| Lightness | medium-light (63%) |
| Chroma | vivid (0.155) |
| Temperature | cool |
| Nearest name | Dark Sky Blue (#448EE4) |
| Black text | 6.05:1 |
| White text | 3.46:1 |
Values
| HEX | #278EE2 |
| RGB | rgb(39, 142, 226) |
| HSL | hsl(207, 76%, 52%) |
| OKLCH | oklch(63.1% 0.155 248.5) |
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 #278EE2 | 3.46:1 | AA large text | Lc -67.2 | Content text, not long reading |
| Black text on #278EE2 | 6.05:1 | AA | Lc 42.3 | Non-text elements, placeholder text |
| #278EE2 text on white | 3.46:1 | AA large text | Lc 61.7 | Content text, not long reading |
| #278EE2 text on black | 6.05:1 | AA | Lc -39.9 | 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
#C4DCF4
oklch(88.4% 0.042 248.3)
-
Step 300
300
#9AC5F0
oklch(80.8% 0.076 248.8)
-
Step 400
400
#5FA6E9
oklch(70.7% 0.122 248.6)
-
Step 500
500 (this color)
#278EE2
oklch(63.1% 0.155 248.5)
-
Step 600
600
#0077C7
oklch(55.7% 0.152 248.5)
-
Step 700
700
#0064A8
oklch(49.2% 0.133 248.3)
-
Step 800
800
#00518B
oklch(42.6% 0.117 248.8)
-
Step 900
900
#024474
oklch(37.8% 0.101 248.2)
-
Step 950
950
#072844
oklch(27% 0.064 248.5)
#278EE2 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) | #6693E5 | 0.054 |
| Deuteranopia (no green cones) | #4982E0 | 0.035 |
| Tritanopia (no blue cones) | #00A2AD | 0.112 |
| Achromatopsia (no color) | #8A8A8A | 0.155 |
Harmonies
Hue rotations in OKLCH that keep this color's lightness and chroma.
Complementary
The opposite hue (180°).
- #278EE2
#278EE2
oklch(63.1% 0.155 248.5)
- #BF7700
#BF7700
oklch(63.2% 0.138 68.4)
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 #278EE2, 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
- Chefchaouen Blue #4895EF ΔE 0.036
- Water Blue #0E87CC ΔE 0.039
- Dodger Blue #1E90FF ΔE 0.043
- Soft Blue #6488EA ΔE 0.051
- Cornflower Blue #6495ED ΔE 0.056
- Cool Blue #4984B8 ΔE 0.065
- Clear Blue #247AFD ΔE 0.071
Use #278EE2 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.