#256B5E
Closest named color: Dark Aqua (#05696B). oklch(48% 0.073 178.5), rgb(37, 107, 94).
Aa
White text reads best on this color (6.28:1).
About this color
#256B5E is a medium-dark, moderately saturated teal or cyan. In OKLCH its lightness is 48%, its chroma 0.073 and its hue 179°. Its hue sits on the cool side of the wheel. The nearest named color is Dark Aqua (#05696B), ΔE 0.026 away. White text reads best on it, at 6.28:1.
| Hue family | Teals and cyans |
| Lightness | medium-dark (48%) |
| Chroma | moderately saturated (0.073) |
| Temperature | cool |
| Nearest name | Dark Aqua (#05696B) |
| Black text | 3.34:1 |
| White text | 6.28:1 |
Values
| HEX | #256B5E |
| RGB | rgb(37, 107, 94) |
| HSL | hsl(169, 49%, 28%) |
| OKLCH | oklch(48% 0.073 178.5) |
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 #256B5E | 6.28:1 | AA | Lc -86.2 | Fine for body text |
| Black text on #256B5E | 3.34:1 | AA large text | Lc 23.0 | Dividers and decoration only |
| #256B5E text on white | 6.28:1 | AA | Lc 81.0 | Fine for body text |
| #256B5E text on black | 3.34:1 | AA large text | Lc -20.8 | 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
#CCDED9
oklch(88.6% 0.02 177.4)
-
Step 300
300
#A9C8C1
oklch(80.8% 0.035 180.2)
-
Step 400
400
#7AADA1
oklch(70.8% 0.057 178.3)
-
Step 500
500
#55988A
oklch(63.1% 0.072 178.8)
-
Step 600
600
#378274
oklch(55.5% 0.078 179.2)
-
Step 700
700 (this color)
#256B5E
oklch(48% 0.073 178.5)
-
Step 800
800
#245A4F
oklch(42.8% 0.06 177.8)
-
Step 900
900
#234A42
oklch(37.8% 0.047 178.6)
-
Step 950
950
#152B27
oklch(26.9% 0.029 181)
#256B5E 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) | #67655D | 0.077 |
| Deuteranopia (no green cones) | #5C5D5F | 0.072 |
| Tritanopia (no blue cones) | #006D67 | 0.017 |
| Achromatopsia (no color) | #606060 | 0.073 |
Harmonies
Hue rotations in OKLCH that keep this color's lightness and chroma.
Complementary
The opposite hue (180°).
- #256B5E
#256B5E
oklch(48% 0.073 178.5)
- #7F4C5D
#7F4C5D
oklch(48.1% 0.072 358.7)
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 #256B5E, closest first.
Similar named colors
The eight closest entries in our named color list, with their ΔE distance.
- Dark Aqua #05696B ΔE 0.026
- Dark Green Blue #1F6357 ΔE 0.026
- Dark Aquamarine #017371 ΔE 0.032
- Deep Turquoise #017374 ΔE 0.036
- Bluegreen #017A79 ΔE 0.052
- Petrol #005F6A ΔE 0.053
- Deep Aqua #08787F ΔE 0.055
- Slate #516572 ΔE 0.064
Use #256B5E 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.