#256A5F
Closest named color: Dark Aqua (#05696B). oklch(47.8% 0.071 180.8), rgb(37, 106, 95).
Aa
White text reads best on this color (6.35:1).
About this color
#256A5F is a medium-dark, moderately saturated teal or cyan. In OKLCH its lightness is 48%, its chroma 0.071 and its hue 181°. Its hue sits on the cool side of the wheel. The nearest named color is Dark Aqua (#05696B), ΔE 0.023 away. White text reads best on it, at 6.35:1.
| Hue family | Teals and cyans |
| Lightness | medium-dark (48%) |
| Chroma | moderately saturated (0.071) |
| Temperature | cool |
| Nearest name | Dark Aqua (#05696B) |
| Black text | 3.30:1 |
| White text | 6.35:1 |
Values
| HEX | #256A5F |
| RGB | rgb(37, 106, 95) |
| HSL | hsl(170, 48%, 28%) |
| OKLCH | oklch(47.8% 0.071 180.8) |
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 #256A5F | 6.35:1 | AA | Lc -86.5 | Fine for body text |
| Black text on #256A5F | 3.30:1 | AA large text | Lc 22.7 | Dividers and decoration only |
| #256A5F text on white | 6.35:1 | AA | Lc 81.4 | Fine for body text |
| #256A5F text on black | 3.30:1 | AA large text | Lc -20.5 | 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
#F2F6F5
oklch(97% 0.004 179.7)
-
Step 100
100
#E3ECEA
oklch(93.6% 0.01 181.4)
-
Step 200
200
#CCDDDA
oklch(88.4% 0.019 184.2)
-
Step 300
300
#AAC8C2
oklch(80.9% 0.033 182)
-
Step 400
400
#7BACA2
oklch(70.7% 0.054 180.6)
-
Step 500
500
#56988C
oklch(63.2% 0.07 180.9)
-
Step 600
600
#388276
oklch(55.6% 0.076 181.2)
-
Step 700
700 (this color)
#256A5F
oklch(47.8% 0.071 180.8)
-
Step 800
800
#245A51
oklch(42.8% 0.059 180.8)
-
Step 900
900
#234A43
oklch(37.8% 0.046 180.6)
-
Step 950
950
#152B27
oklch(26.9% 0.029 181)
#256A5F 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) | #65645F | 0.075 |
| Deuteranopia (no green cones) | #5B5C60 | 0.072 |
| Tritanopia (no blue cones) | #006C67 | 0.017 |
| Achromatopsia (no color) | #5F5F5F | 0.071 |
Harmonies
Hue rotations in OKLCH that keep this color's lightness and chroma.
Complementary
The opposite hue (180°).
- #256A5F
#256A5F
oklch(47.8% 0.071 180.8)
- #7E4C5B
#7E4C5B
oklch(47.9% 0.07 0.7)
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 #256A5F, closest first.
Similar named colors
The eight closest entries in our named color list, with their ΔE distance.
- Dark Aqua #05696B ΔE 0.023
- Dark Green Blue #1F6357 ΔE 0.024
- Dark Aquamarine #017371 ΔE 0.033
- Deep Turquoise #017374 ΔE 0.036
- Petrol #005F6A ΔE 0.049
- Bluegreen #017A79 ΔE 0.053
- Deep Aqua #08787F ΔE 0.055
- Slate #516572 ΔE 0.062
Use #256A5F 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.