#278EB8
Closest named color: Blue NCS (#118AB2). oklch(60.9% 0.11 230.5), rgb(39, 142, 184).
Aa
Black text reads best on this color (5.64:1).
About this color
#278EB8 is a medium-dark, moderately saturated blue. In OKLCH its lightness is 61%, its chroma 0.110 and its hue 231°. Its hue sits on the cool side of the wheel. The nearest named color is Blue NCS (#118AB2), ΔE 0.017 away. Black text reads best on it, at 5.64:1.
| Hue family | Blues |
| Lightness | medium-dark (61%) |
| Chroma | moderately saturated (0.110) |
| Temperature | cool |
| Nearest name | Blue NCS (#118AB2) |
| Black text | 5.64:1 |
| White text | 3.71:1 |
Values
| HEX | #278EB8 |
| RGB | rgb(39, 142, 184) |
| HSL | hsl(197, 65%, 44%) |
| OKLCH | oklch(60.9% 0.11 230.5) |
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 #278EB8 | 3.71:1 | AA large text | Lc -69.9 | Content text, not long reading |
| Black text on #278EB8 | 5.64:1 | AA | Lc 39.7 | Non-text elements, placeholder text |
| #278EB8 text on white | 3.71:1 | AA large text | Lc 64.4 | Content text, not long reading |
| #278EB8 text on black | 5.64:1 | AA | Lc -37.3 | 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
#F1F6F9
oklch(97% 0.007 233.6)
-
Step 100
100
#E0ECF2
oklch(93.6% 0.015 229)
-
Step 200
200
#C6DDE9
oklch(88.4% 0.03 230.3)
-
Step 300
300
#9EC8DD
oklch(81% 0.053 229.8)
-
Step 400
400
#65ABCC
oklch(70.8% 0.086 230)
-
Step 500
500 (this color)
#278EB8
oklch(60.9% 0.11 230.5)
-
Step 600
600
#007EA8
oklch(55.6% 0.112 230.6)
-
Step 700
700
#006A8E
oklch(49.1% 0.099 230.6)
-
Step 800
800
#005775
oklch(42.8% 0.086 230.3)
-
Step 900
900
#084860
oklch(37.7% 0.071 230.1)
-
Step 950
950
#0A2A38
oklch(26.9% 0.045 230.7)
#278EB8 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) | #798CBA | 0.075 |
| Deuteranopia (no green cones) | #657EB7 | 0.064 |
| Tritanopia (no blue cones) | #009A9C | 0.065 |
| Achromatopsia (no color) | #848484 | 0.110 |
Harmonies
Hue rotations in OKLCH that keep this color's lightness and chroma.
Complementary
The opposite hue (180°).
- #278EB8
#278EB8
oklch(60.9% 0.11 230.5)
- #B76E42
#B76E42
oklch(60.9% 0.11 50.5)
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 #278EB8, closest first.
Similar named colors
The eight closest entries in our named color list, with their ΔE distance.
- Blue NCS #118AB2 ΔE 0.017
- Cool Blue #4984B8 ΔE 0.034
- Steel Blue #4682B4 ΔE 0.036
- Off Blue #5684AE ΔE 0.041
- Dusty Blue #5A86AD ΔE 0.042
- Water Blue #0E87CC ΔE 0.042
- Teal Blue #01889F ΔE 0.043
- Faded Blue #658CBB ΔE 0.051
Use #278EB8 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.