#256D8D
Closest named color: Sea Blue (#047495). oklch(50.5% 0.086 231.4), rgb(37, 109, 141).
Aa
White text reads best on this color (5.75:1).
About this color
#256D8D is a medium-dark, moderately saturated blue. In OKLCH its lightness is 51%, its chroma 0.086 and its hue 231°. Its hue sits on the cool side of the wheel. The nearest named color is Sea Blue (#047495), ΔE 0.022 away. White text reads best on it, at 5.75:1.
| Hue family | Blues |
| Lightness | medium-dark (51%) |
| Chroma | moderately saturated (0.086) |
| Temperature | cool |
| Nearest name | Sea Blue (#047495) |
| Black text | 3.65:1 |
| White text | 5.75:1 |
Values
| HEX | #256D8D |
| RGB | rgb(37, 109, 141) |
| HSL | hsl(198, 58%, 35%) |
| OKLCH | oklch(50.5% 0.086 231.4) |
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 #256D8D | 5.75:1 | AA | Lc -83.7 | Fine for body text |
| Black text on #256D8D | 3.65:1 | AA large text | Lc 25.6 | Dividers and decoration only |
| #256D8D text on white | 5.75:1 | AA | Lc 78.5 | Fine for body text |
| #256D8D text on black | 3.65:1 | AA large text | Lc -23.3 | 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
#F2F6F8
oklch(97.1% 0.005 228.8)
-
Step 100
100
#E2EBF1
oklch(93.5% 0.013 236.6)
-
Step 200
200
#CBDCE6
oklch(88.5% 0.023 233.4)
-
Step 300
300
#A6C6D7
oklch(80.9% 0.042 231.1)
-
Step 400
400
#75A9C3
oklch(70.8% 0.067 230.6)
-
Step 500
500
#4F93B4
oklch(63.2% 0.085 231.3)
-
Step 600
600
#2E7DA0
oklch(55.7% 0.093 231)
-
Step 700
700 (this color)
#256D8D
oklch(50.5% 0.086 231.4)
-
Step 800
800
#1D566F
oklch(42.8% 0.071 230.8)
-
Step 900
900
#1F475A
oklch(37.8% 0.055 231.4)
-
Step 950
950
#132A35
oklch(27.2% 0.035 230.7)
#256D8D 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) | #5D6C8F | 0.058 |
| Deuteranopia (no green cones) | #4F618D | 0.051 |
| Tritanopia (no blue cones) | #007678 | 0.052 |
| Achromatopsia (no color) | #666666 | 0.086 |
Harmonies
Hue rotations in OKLCH that keep this color's lightness and chroma.
Complementary
The opposite hue (180°).
- #256D8D
#256D8D
oklch(50.5% 0.086 231.4)
- #8B5534
#8B5534
oklch(50.4% 0.086 51.2)
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 #256D8D, closest first.
Similar named colors
The eight closest entries in our named color list, with their ΔE distance.
- Sea Blue #047495 ΔE 0.022
- Ocean Blue #03719C ΔE 0.025
- Peacock Blue #016795 ΔE 0.030
- Denim #3B638C ΔE 0.032
- Muted Blue #3B719F ΔE 0.036
- Ocean #017B92 ΔE 0.041
- Metallic Blue #4F738E ΔE 0.045
- Deep Aqua #08787F ΔE 0.047
Use #256D8D 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.