#256A5E
Closest named color: Dark Green Blue (#1F6357). oklch(47.7% 0.071 179.5), rgb(37, 106, 94).
Aa
White text reads best on this color (6.35:1).
About this color
#256A5E is a medium-dark, moderately saturated teal or cyan. In OKLCH its lightness is 48%, its chroma 0.071 and its hue 180°. Its hue sits on the cool side of the wheel. The nearest named color is Dark Green Blue (#1F6357), ΔE 0.024 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 Green Blue (#1F6357) |
| Black text | 3.30:1 |
| White text | 6.35:1 |
Values
| HEX | #256A5E |
| RGB | rgb(37, 106, 94) |
| HSL | hsl(170, 48%, 28%) |
| OKLCH | oklch(47.7% 0.071 179.5) |
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 #256A5E | 6.35:1 | AA | Lc -86.5 | Fine for body text |
| Black text on #256A5E | 3.30:1 | AA large text | Lc 22.7 | Dividers and decoration only |
| #256A5E text on white | 6.35:1 | AA | Lc 81.4 | Fine for body text |
| #256A5E 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
#CCDDD9
oklch(88.4% 0.019 180.2)
-
Step 300
300
#AAC8C1
oklch(80.9% 0.034 179.7)
-
Step 400
400
#7BACA1
oklch(70.6% 0.055 179.2)
-
Step 500
500
#56988B
oklch(63.2% 0.071 179.8)
-
Step 600
600
#388275
oklch(55.6% 0.077 180.1)
-
Step 700
700 (this color)
#256A5E
oklch(47.7% 0.071 179.5)
-
Step 800
800
#245A50
oklch(42.8% 0.06 179.3)
-
Step 900
900
#234A42
oklch(37.8% 0.047 178.6)
-
Step 950
950
#152B27
oklch(26.9% 0.029 181)
#256A5E 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) | #66645E | 0.076 |
| Deuteranopia (no green cones) | #5B5C5F | 0.072 |
| Tritanopia (no blue cones) | #006C66 | 0.017 |
| Achromatopsia (no color) | #5F5F5F | 0.072 |
Harmonies
Hue rotations in OKLCH that keep this color's lightness and chroma.
Complementary
The opposite hue (180°).
- #256A5E
#256A5E
oklch(47.7% 0.071 179.5)
- #7E4B5B
#7E4B5B
oklch(47.7% 0.072 360)
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 #256A5E, closest first.
Similar named colors
The eight closest entries in our named color list, with their ΔE distance.
- Dark Green Blue #1F6357 ΔE 0.024
- Dark Aqua #05696B ΔE 0.025
- Dark Aquamarine #017371 ΔE 0.034
- Deep Turquoise #017374 ΔE 0.037
- Petrol #005F6A ΔE 0.050
- Bluegreen #017A79 ΔE 0.054
- Deep Aqua #08787F ΔE 0.057
- Slate #516572 ΔE 0.063
Use #256A5E 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.