#278B80
Closest named color: Dark Cyan (#008B8B). oklch(57.8% 0.091 184.3), rgb(39, 139, 128).
Aa
Black text reads best on this color (5.09:1).
About this color
#278B80 is a medium-dark, moderately saturated teal or cyan. In OKLCH its lightness is 58%, its chroma 0.091 and its hue 184°. Its hue sits on the cool side of the wheel. The nearest named color is Dark Cyan (#008B8B), ΔE 0.019 away. Black text reads best on it, at 5.09:1.
| Hue family | Teals and cyans |
| Lightness | medium-dark (58%) |
| Chroma | moderately saturated (0.091) |
| Temperature | cool |
| Nearest name | Dark Cyan (#008B8B) |
| Black text | 5.09:1 |
| White text | 4.12:1 |
Values
| HEX | #278B80 |
| RGB | rgb(39, 139, 128) |
| HSL | hsl(173, 56%, 35%) |
| OKLCH | oklch(57.8% 0.091 184.3) |
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 #278B80 | 4.12:1 | AA large text | Lc -73.5 | Content text, not long reading |
| Black text on #278B80 | 5.09:1 | AA | Lc 36.1 | Non-text elements, placeholder text |
| #278B80 text on white | 4.12:1 | AA large text | Lc 68.0 | Content text, not long reading |
| #278B80 text on black | 5.09:1 | AA | Lc -33.6 | 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
#E2EDEB
oklch(93.7% 0.012 184.1)
-
Step 200
200
#CADEDB
oklch(88.5% 0.022 186)
-
Step 300
300
#A4CAC4
oklch(81% 0.041 184.7)
-
Step 400
400
#70AEA5
oklch(70.6% 0.066 184.3)
-
Step 500
500
#459A8F
oklch(63.1% 0.084 184)
-
Step 600
600 (this color)
#278B80
oklch(57.8% 0.091 184.3)
-
Step 700
700
#0A7066
oklch(49.1% 0.085 184)
-
Step 800
800
#115B53
oklch(42.6% 0.07 184)
-
Step 900
900
#184B45
oklch(37.7% 0.055 184.4)
-
Step 950
950
#102C28
oklch(27% 0.035 183.1)
#278B80 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) | #848380 | 0.097 |
| Deuteranopia (no green cones) | #767981 | 0.091 |
| Tritanopia (no blue cones) | #008E87 | 0.014 |
| Achromatopsia (no color) | #7D7D7D | 0.092 |
Harmonies
Hue rotations in OKLCH that keep this color's lightness and chroma.
Complementary
The opposite hue (180°).
- #278B80
#278B80
oklch(57.8% 0.091 184.3)
- #A76273
#A76273
oklch(57.8% 0.091 4.4)
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 #278B80, closest first.
Similar named colors
The eight closest entries in our named color list, with their ΔE distance.
- Dark Cyan #008B8B ΔE 0.019
- Dusty Teal #4C9085 ΔE 0.034
- Teal Green #0A9396 ΔE 0.034
- Teal #008080 ΔE 0.039
- Blue Green #0F9B8E ΔE 0.046
- Viridian #1E9167 ΔE 0.048
- Sea #3C9992 ΔE 0.049
- Teal Blue #01889F ΔE 0.052
Use #278B80 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.