#278C8D
Closest named color: Dark Cyan (#008B8B). oklch(58.5% 0.089 196), rgb(39, 140, 141).
Aa
Black text reads best on this color (5.22:1).
About this color
#278C8D is a medium-dark, moderately saturated teal or cyan. In OKLCH its lightness is 59%, its chroma 0.089 and its hue 196°. Its hue sits on the cool side of the wheel. The nearest named color is Dark Cyan (#008B8B), ΔE 0.013 away. Black text reads best on it, at 5.22:1.
| Hue family | Teals and cyans |
| Lightness | medium-dark (59%) |
| Chroma | moderately saturated (0.089) |
| Temperature | cool |
| Nearest name | Dark Cyan (#008B8B) |
| Black text | 5.22:1 |
| White text | 4.02:1 |
Values
| HEX | #278C8D |
| RGB | rgb(39, 140, 141) |
| HSL | hsl(181, 57%, 35%) |
| OKLCH | oklch(58.5% 0.089 196) |
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 #278C8D | 4.02:1 | AA large text | Lc -72.7 | Content text, not long reading |
| Black text on #278C8D | 5.22:1 | AA | Lc 36.9 | Non-text elements, placeholder text |
| #278C8D text on white | 4.02:1 | AA large text | Lc 67.1 | Content text, not long reading |
| #278C8D text on black | 5.22:1 | AA | Lc -34.5 | 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
#F2F7F6
oklch(97.2% 0.005 183)
-
Step 100
100
#E2ECEC
oklch(93.6% 0.011 197)
-
Step 200
200
#C9DEDE
oklch(88.5% 0.022 196.8)
-
Step 300
300
#A3C9C9
oklch(80.8% 0.04 196.4)
-
Step 400
400
#6FADAE
oklch(70.6% 0.064 197.1)
-
Step 500
500
#43999A
oklch(63.1% 0.082 196.3)
-
Step 600
600 (this color)
#278C8D
oklch(58.5% 0.089 196)
-
Step 700
700
#046F70
oklch(49.1% 0.083 195.9)
-
Step 800
800
#0E5A5B
oklch(42.6% 0.068 196.3)
-
Step 900
900
#174A4B
oklch(37.6% 0.053 197)
-
Step 950
950
#0F2C2C
oklch(27.1% 0.035 195.3)
#278C8D 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) | #82858D | 0.092 |
| Deuteranopia (no green cones) | #737A8E | 0.086 |
| Tritanopia (no blue cones) | #00918C | 0.018 |
| Achromatopsia (no color) | #7F7F7F | 0.090 |
Harmonies
Hue rotations in OKLCH that keep this color's lightness and chroma.
Complementary
The opposite hue (180°).
- #278C8D
#278C8D
oklch(58.5% 0.089 196)
- #AA656A
#AA656A
oklch(58.5% 0.089 15.5)
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 #278C8D, closest first.
Similar named colors
The eight closest entries in our named color list, with their ΔE distance.
- Dark Cyan #008B8B ΔE 0.013
- Teal Green #0A9396 ΔE 0.021
- Dusty Teal #4C9085 ΔE 0.033
- Teal Blue #01889F ΔE 0.035
- Teal #008080 ΔE 0.042
- Sea #3C9992 ΔE 0.043
- Blue Green #0F9B8E ΔE 0.045
- Persian Green #2A9D8F ΔE 0.052
Use #278C8D 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.