#278DAD
Closest named color: Blue NCS (#118AB2). oklch(60.1% 0.101 223.9), rgb(39, 141, 173).
Aa
Black text reads best on this color (5.49:1).
About this color
#278DAD is a medium-dark, moderately saturated teal or cyan. In OKLCH its lightness is 60%, its chroma 0.101 and its hue 224°. Its hue sits on the cool side of the wheel. The nearest named color is Blue NCS (#118AB2), ΔE 0.016 away. Black text reads best on it, at 5.49:1.
| Hue family | Teals and cyans |
| Lightness | medium-dark (60%) |
| Chroma | moderately saturated (0.101) |
| Temperature | cool |
| Nearest name | Blue NCS (#118AB2) |
| Black text | 5.49:1 |
| White text | 3.81:1 |
Values
| HEX | #278DAD |
| RGB | rgb(39, 141, 173) |
| HSL | hsl(194, 63%, 42%) |
| OKLCH | oklch(60.1% 0.101 223.9) |
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 #278DAD | 3.81:1 | AA large text | Lc -70.8 | Content text, not long reading |
| Black text on #278DAD | 5.49:1 | AA | Lc 38.8 | Non-text elements, placeholder text |
| #278DAD text on white | 3.81:1 | AA large text | Lc 65.3 | Content text, not long reading |
| #278DAD text on black | 5.49:1 | AA | Lc -36.3 | 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
#E0ECF1
oklch(93.6% 0.015 224.5)
-
Step 200
200
#C7DEE7
oklch(88.6% 0.028 223.3)
-
Step 300
300
#9FC8D8
oklch(80.9% 0.049 223.7)
-
Step 400
400
#66ACC5
oklch(70.8% 0.079 223.1)
-
Step 500
500 (this color)
#278DAD
oklch(60.1% 0.101 223.9)
-
Step 600
600
#0080A0
oklch(55.7% 0.104 223.4)
-
Step 700
700
#006B87
oklch(49% 0.092 224)
-
Step 800
800
#00586F
oklch(42.7% 0.08 223.4)
-
Step 900
900
#0B495B
oklch(37.8% 0.066 223)
-
Step 950
950
#0A2B35
oklch(27% 0.042 221.8)
#278DAD 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) | #7B8AAF | 0.079 |
| Deuteranopia (no green cones) | #697DAD | 0.069 |
| Tritanopia (no blue cones) | #009797 | 0.053 |
| Achromatopsia (no color) | #828282 | 0.101 |
Harmonies
Hue rotations in OKLCH that keep this color's lightness and chroma.
Complementary
The opposite hue (180°).
- #278DAD
#278DAD
oklch(60.1% 0.101 223.9)
- #B36C4D
#B36C4D
oklch(60.2% 0.101 44)
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 #278DAD, closest first.
Similar named colors
The eight closest entries in our named color list, with their ΔE distance.
- Blue NCS #118AB2 ΔE 0.016
- Teal Blue #01889F ΔE 0.028
- Steel Blue #4682B4 ΔE 0.040
- Cool Blue #4984B8 ΔE 0.041
- Off Blue #5684AE ΔE 0.042
- Dusty Blue #5A86AD ΔE 0.042
- Teal Green #0A9396 ΔE 0.046
- Cerulean #457B9D ΔE 0.052
Use #278DAD 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.