#278AA8
Closest named color: Blue NCS (#118AB2). oklch(59.1% 0.098 222.9), rgb(39, 138, 168).
Aa
Black text reads best on this color (5.28:1).
About this color
#278AA8 is a medium-dark, moderately saturated teal or cyan. In OKLCH its lightness is 59%, its chroma 0.098 and its hue 223°. 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 5.28:1.
| Hue family | Teals and cyans |
| Lightness | medium-dark (59%) |
| Chroma | moderately saturated (0.098) |
| Temperature | cool |
| Nearest name | Blue NCS (#118AB2) |
| Black text | 5.28:1 |
| White text | 3.97:1 |
Values
| HEX | #278AA8 |
| RGB | rgb(39, 138, 168) |
| HSL | hsl(194, 62%, 41%) |
| OKLCH | oklch(59.1% 0.098 222.9) |
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 #278AA8 | 3.97:1 | AA large text | Lc -72.2 | Content text, not long reading |
| Black text on #278AA8 | 5.28:1 | AA | Lc 37.4 | Non-text elements, placeholder text |
| #278AA8 text on white | 3.97:1 | AA large text | Lc 66.7 | Content text, not long reading |
| #278AA8 text on black | 5.28:1 | AA | Lc -35.0 | 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 600.
-
Step 50
50
#F1F6F8
oklch(97% 0.006 223.5)
-
Step 100
100
#E1ECF0
oklch(93.6% 0.013 221.4)
-
Step 200
200
#C9DDE5
oklch(88.5% 0.024 223.7)
-
Step 300
300
#A2C8D6
oklch(81% 0.045 222.3)
-
Step 400
400
#6EABC1
oklch(70.8% 0.071 222.8)
-
Step 500
500
#4195B1
oklch(63% 0.091 223.1)
-
Step 600
600 (this color)
#278AA8
oklch(59.1% 0.098 222.9)
-
Step 700
700
#006B86
oklch(49% 0.091 223.1)
-
Step 800
800
#0B586D
oklch(42.8% 0.076 222.4)
-
Step 900
900
#164858
oklch(37.6% 0.059 223.1)
-
Step 950
950
#0F2A34
oklch(26.9% 0.038 225.1)
#278AA8 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) | #7987AA | 0.078 |
| Deuteranopia (no green cones) | #677AA8 | 0.069 |
| Tritanopia (no blue cones) | #009394 | 0.048 |
| Achromatopsia (no color) | #808080 | 0.099 |
Harmonies
Hue rotations in OKLCH that keep this color's lightness and chroma.
Complementary
The opposite hue (180°).
- #278AA8
#278AA8
oklch(59.1% 0.098 222.9)
- #AE694D
#AE694D
oklch(59.1% 0.098 42.6)
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 #278AA8, closest first.
Similar named colors
The eight closest entries in our named color list, with their ΔE distance.
- Blue NCS #118AB2 ΔE 0.017
- Teal Blue #01889F ΔE 0.020
- Steel Blue #4682B4 ΔE 0.039
- Off Blue #5684AE ΔE 0.042
- Cool Blue #4984B8 ΔE 0.042
- Dusty Blue #5A86AD ΔE 0.043
- Cerulean #457B9D ΔE 0.044
- Teal Green #0A9396 ΔE 0.045
Use #278AA8 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.