#256B66
Closest named color: Dark Aqua (#05696B). oklch(48.3% 0.069 188.5), rgb(37, 107, 102).
Aa
White text reads best on this color (6.22:1).
About this color
#256B66 is a medium-dark, muted teal or cyan. In OKLCH its lightness is 48%, its chroma 0.069 and its hue 188°. Its hue sits on the cool side of the wheel. The nearest named color is Dark Aqua (#05696B), ΔE 0.018 away. White text reads best on it, at 6.22:1.
| Hue family | Teals and cyans |
| Lightness | medium-dark (48%) |
| Chroma | muted (0.069) |
| Temperature | cool |
| Nearest name | Dark Aqua (#05696B) |
| Black text | 3.37:1 |
| White text | 6.22:1 |
Values
| HEX | #256B66 |
| RGB | rgb(37, 107, 102) |
| HSL | hsl(176, 49%, 28%) |
| OKLCH | oklch(48.3% 0.069 188.5) |
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 #256B66 | 6.22:1 | AA | Lc -85.9 | Fine for body text |
| Black text on #256B66 | 3.37:1 | AA large text | Lc 23.3 | Dividers and decoration only |
| #256B66 text on white | 6.22:1 | AA | Lc 80.8 | Fine for body text |
| #256B66 text on black | 3.37:1 | AA large text | Lc -21.1 | Dividers and decoration only |
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 700.
-
Step 50
50
#F2F6F6
oklch(97% 0.004 197.1)
-
Step 100
100
#E3ECEB
oklch(93.6% 0.01 189.1)
-
Step 200
200
#CCDDDB
oklch(88.4% 0.018 188.3)
-
Step 300
300
#A9C8C5
oklch(80.9% 0.034 189.3)
-
Step 400
400
#7AACA7
oklch(70.8% 0.054 188.3)
-
Step 500
500
#559791
oklch(63.1% 0.068 188)
-
Step 600
600
#36817C
oklch(55.5% 0.074 189.3)
-
Step 700
700 (this color)
#256B66
oklch(48.3% 0.069 188.5)
-
Step 800
800
#235955
oklch(42.7% 0.057 188.6)
-
Step 900
900
#224946
oklch(37.6% 0.045 188.9)
-
Step 950
950
#152B29
oklch(27% 0.028 188.1)
#256B66 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) | #656566 | 0.074 |
| Deuteranopia (no green cones) | #5A5D67 | 0.070 |
| Tritanopia (no blue cones) | #006E69 | 0.015 |
| Achromatopsia (no color) | #616161 | 0.070 |
Harmonies
Hue rotations in OKLCH that keep this color's lightness and chroma.
Complementary
The opposite hue (180°).
- #256B66
#256B66
oklch(48.3% 0.069 188.5)
- #804E56
#804E56
oklch(48.3% 0.068 9.5)
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 #256B66, closest first.
Similar named colors
The eight closest entries in our named color list, with their ΔE distance.
- Dark Aqua #05696B ΔE 0.018
- Dark Aquamarine #017371 ΔE 0.026
- Deep Turquoise #017374 ΔE 0.028
- Dark Green Blue #1F6357 ΔE 0.031
- Bluegreen #017A79 ΔE 0.047
- Deep Aqua #08787F ΔE 0.047
- Petrol #005F6A ΔE 0.047
- Slate #516572 ΔE 0.055
Use #256B66 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.