#278E83
Closest named color: Dark Cyan (#008B8B). oklch(58.7% 0.093 184.6), rgb(39, 142, 131).
Aa
Black text reads best on this color (5.28:1).
About this color
#278E83 is a medium-dark, moderately saturated teal or cyan. In OKLCH its lightness is 59%, its chroma 0.093 and its hue 185°. Its hue sits on the cool side of the wheel. The nearest named color is Dark Cyan (#008B8B), ΔE 0.021 away. Black text reads best on it, at 5.28:1.
| Hue family | Teals and cyans |
| Lightness | medium-dark (59%) |
| Chroma | moderately saturated (0.093) |
| Temperature | cool |
| Nearest name | Dark Cyan (#008B8B) |
| Black text | 5.28:1 |
| White text | 3.97:1 |
Values
| HEX | #278E83 |
| RGB | rgb(39, 142, 131) |
| HSL | hsl(174, 57%, 35%) |
| OKLCH | oklch(58.7% 0.093 184.6) |
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 #278E83 | 3.97:1 | AA large text | Lc -72.2 | Content text, not long reading |
| Black text on #278E83 | 5.28:1 | AA | Lc 37.3 | Non-text elements, placeholder text |
| #278E83 text on white | 3.97:1 | AA large text | Lc 66.7 | Content text, not long reading |
| #278E83 text on black | 5.28:1 | AA | Lc -34.9 | 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
#C9DEDB
oklch(88.4% 0.023 186.4)
-
Step 300
300
#A3CAC4
oklch(80.9% 0.042 184.9)
-
Step 400
400
#6FAFA6
oklch(70.8% 0.067 184.6)
-
Step 500
500
#439A90
oklch(63% 0.085 185.1)
-
Step 600
600 (this color)
#278E83
oklch(58.7% 0.093 184.6)
-
Step 700
700
#027067
oklch(49% 0.086 185.1)
-
Step 800
800
#0D5B54
oklch(42.6% 0.071 185.5)
-
Step 900
900
#174B45
oklch(37.7% 0.055 184.5)
-
Step 950
950
#0F2C28
oklch(27% 0.036 183.4)
#278E83 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) | #878683 | 0.099 |
| Deuteranopia (no green cones) | #787B84 | 0.093 |
| Tritanopia (no blue cones) | #00918A | 0.013 |
| Achromatopsia (no color) | #808080 | 0.094 |
Harmonies
Hue rotations in OKLCH that keep this color's lightness and chroma.
Complementary
The opposite hue (180°).
- #278E83
#278E83
oklch(58.7% 0.093 184.6)
- #AA6475
#AA6475
oklch(58.6% 0.092 4.7)
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 #278E83, closest first.
Similar named colors
The eight closest entries in our named color list, with their ΔE distance.
- Dark Cyan #008B8B ΔE 0.021
- Teal Green #0A9396 ΔE 0.028
- Dusty Teal #4C9085 ΔE 0.028
- Blue Green #0F9B8E ΔE 0.037
- Sea #3C9992 ΔE 0.040
- Persian Green #2A9D8F ΔE 0.045
- Teal #008080 ΔE 0.047
- Viridian #1E9167 ΔE 0.047
Use #278E83 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.