#256F5E
Closest named color: Dark Aquamarine (#017371). oklch(49.1% 0.078 174.8), rgb(37, 111, 94).
Aa
White text reads best on this color (5.97:1).
About this color
#256F5E is a medium-dark, moderately saturated teal or cyan. In OKLCH its lightness is 49%, its chroma 0.078 and its hue 175°. Its hue sits on the cool side of the wheel. The nearest named color is Dark Aquamarine (#017371), ΔE 0.029 away. White text reads best on it, at 5.97:1.
| Hue family | Teals and cyans |
| Lightness | medium-dark (49%) |
| Chroma | moderately saturated (0.078) |
| Temperature | cool |
| Nearest name | Dark Aquamarine (#017371) |
| Black text | 3.51:1 |
| White text | 5.97:1 |
Values
| HEX | #256F5E |
| RGB | rgb(37, 111, 94) |
| HSL | hsl(166, 50%, 29%) |
| OKLCH | oklch(49.1% 0.078 174.8) |
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 #256F5E | 5.97:1 | AA | Lc -84.8 | Fine for body text |
| Black text on #256F5E | 3.51:1 | AA large text | Lc 24.4 | Dividers and decoration only |
| #256F5E text on white | 5.97:1 | AA | Lc 79.6 | Fine for body text |
| #256F5E text on black | 3.51:1 | AA large text | Lc -22.2 | 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
#F2F7F5
oklch(97.2% 0.006 170.4)
-
Step 100
100
#E3ECE9
oklch(93.5% 0.01 174.3)
-
Step 200
200
#CCDED8
oklch(88.5% 0.021 173.9)
-
Step 300
300
#A8C9BF
oklch(80.9% 0.038 175)
-
Step 400
400
#79AD9E
oklch(70.7% 0.059 174.6)
-
Step 500
500
#539987
oklch(63.2% 0.077 175.1)
-
Step 600
600
#348370
oklch(55.6% 0.083 174.7)
-
Step 700
700 (this color)
#256F5E
oklch(49.1% 0.078 174.8)
-
Step 800
800
#215A4D
oklch(42.6% 0.063 175.6)
-
Step 900
900
#214A40
oklch(37.6% 0.05 175.5)
-
Step 950
950
#142C25
oklch(27.1% 0.033 172.8)
#256F5E 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) | #6B685D | 0.081 |
| Deuteranopia (no green cones) | #60605F | 0.077 |
| Tritanopia (no blue cones) | #00706A | 0.021 |
| Achromatopsia (no color) | #636363 | 0.078 |
Harmonies
Hue rotations in OKLCH that keep this color's lightness and chroma.
Complementary
The opposite hue (180°).
- #256F5E
#256F5E
oklch(49.1% 0.078 174.8)
- #834E63
#834E63
oklch(49.2% 0.076 355)
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 #256F5E, closest first.
Similar named colors
The eight closest entries in our named color list, with their ΔE distance.
- Dark Aquamarine #017371 ΔE 0.029
- Deep Turquoise #017374 ΔE 0.033
- Dark Aqua #05696B ΔE 0.035
- Dark Green Blue #1F6357 ΔE 0.038
- Bluegreen #017A79 ΔE 0.045
- Deep Aqua #08787F ΔE 0.051
- Teal #008080 ΔE 0.062
- Petrol #005F6A ΔE 0.065
Use #256F5E 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.