#278A8D
Closest named color: Dark Cyan (#008B8B). oklch(58% 0.088 198), rgb(39, 138, 141).
Aa
Black text reads best on this color (5.10:1).
About this color
#278A8D is a medium-dark, moderately saturated teal or cyan. In OKLCH its lightness is 58%, its chroma 0.088 and its hue 198°. Its hue sits on the cool side of the wheel. The nearest named color is Dark Cyan (#008B8B), ΔE 0.012 away. Black text reads best on it, at 5.10:1.
| Hue family | Teals and cyans |
| Lightness | medium-dark (58%) |
| Chroma | moderately saturated (0.088) |
| Temperature | cool |
| Nearest name | Dark Cyan (#008B8B) |
| Black text | 5.10:1 |
| White text | 4.11:1 |
Values
| HEX | #278A8D |
| RGB | rgb(39, 138, 141) |
| HSL | hsl(182, 57%, 35%) |
| OKLCH | oklch(58% 0.088 198) |
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 #278A8D | 4.11:1 | AA large text | Lc -73.4 | Content text, not long reading |
| Black text on #278A8D | 5.10:1 | AA | Lc 36.2 | Non-text elements, placeholder text |
| #278A8D text on white | 4.11:1 | AA large text | Lc 67.9 | Content text, not long reading |
| #278A8D text on black | 5.10:1 | AA | Lc -33.7 | 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 600.
-
Step 50
50
#F2F7F7
oklch(97.2% 0.005 197.1)
-
Step 100
100
#E2ECEC
oklch(93.6% 0.011 197)
-
Step 200
200
#C9DEDE
oklch(88.5% 0.022 196.8)
-
Step 300
300
#A4C9CA
oklch(80.9% 0.039 198.4)
-
Step 400
400
#70ADAF
oklch(70.7% 0.063 198.5)
-
Step 500
500
#45989B
oklch(63% 0.08 198.5)
-
Step 600
600 (this color)
#278A8D
oklch(58% 0.088 198)
-
Step 700
700
#086F71
oklch(49.2% 0.082 197.1)
-
Step 800
800
#105A5C
oklch(42.7% 0.067 197.7)
-
Step 900
900
#184A4C
oklch(37.7% 0.053 198.9)
-
Step 950
950
#102B2C
oklch(26.9% 0.033 198.6)
#278A8D 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) | #80838D | 0.090 |
| Deuteranopia (no green cones) | #71788E | 0.085 |
| Tritanopia (no blue cones) | #008F8B | 0.019 |
| Achromatopsia (no color) | #7D7D7D | 0.088 |
Harmonies
Hue rotations in OKLCH that keep this color's lightness and chroma.
Complementary
The opposite hue (180°).
- #278A8D
#278A8D
oklch(58% 0.088 198)
- #A86466
#A86466
oklch(57.9% 0.088 18.3)
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 #278A8D, closest first.
Similar named colors
The eight closest entries in our named color list, with their ΔE distance.
- Dark Cyan #008B8B ΔE 0.012
- Teal Green #0A9396 ΔE 0.026
- Teal Blue #01889F ΔE 0.032
- Dusty Teal #4C9085 ΔE 0.037
- Teal #008080 ΔE 0.038
- Sea #3C9992 ΔE 0.048
- Blue Green #0F9B8E ΔE 0.051
- Ocean #017B92 ΔE 0.053
Use #278A8D 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.