#256C8A
Closest named color: Sea Blue (#047495). oklch(50.1% 0.084 230), rgb(37, 108, 138).
Aa
White text reads best on this color (5.84:1).
About this color
#256C8A is a medium-dark, moderately saturated blue. In OKLCH its lightness is 50%, its chroma 0.084 and its hue 230°. Its hue sits on the cool side of the wheel. The nearest named color is Sea Blue (#047495), ΔE 0.026 away. White text reads best on it, at 5.84:1.
| Hue family | Blues |
| Lightness | medium-dark (50%) |
| Chroma | moderately saturated (0.084) |
| Temperature | cool |
| Nearest name | Sea Blue (#047495) |
| Black text | 3.59:1 |
| White text | 5.84:1 |
Values
| HEX | #256C8A |
| RGB | rgb(37, 108, 138) |
| HSL | hsl(198, 58%, 34%) |
| OKLCH | oklch(50.1% 0.084 230) |
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 #256C8A | 5.84:1 | AA | Lc -84.2 | Fine for body text |
| Black text on #256C8A | 3.59:1 | AA large text | Lc 25.1 | Dividers and decoration only |
| #256C8A text on white | 5.84:1 | AA | Lc 79.0 | Fine for body text |
| #256C8A text on black | 3.59:1 | AA large text | Lc -22.8 | 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
#F2F6F8
oklch(97.1% 0.005 228.8)
-
Step 100
100
#E2EBF0
oklch(93.5% 0.012 231.7)
-
Step 200
200
#CBDCE5
oklch(88.4% 0.022 230.6)
-
Step 300
300
#A7C6D6
oklch(80.9% 0.04 230.3)
-
Step 400
400
#76A9C2
oklch(70.8% 0.065 230)
-
Step 500
500
#5093B2
oklch(63.1% 0.083 229.9)
-
Step 600
600
#307D9E
oklch(55.7% 0.09 229.9)
-
Step 700
700 (this color)
#256C8A
oklch(50.1% 0.084 230)
-
Step 800
800
#1E566E
oklch(42.8% 0.07 230)
-
Step 900
900
#1F4759
oklch(37.7% 0.054 229.9)
-
Step 950
950
#132A34
oklch(27.1% 0.034 228.3)
#256C8A 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) | #5D6A8B | 0.058 |
| Deuteranopia (no green cones) | #4F608A | 0.051 |
| Tritanopia (no blue cones) | #007476 | 0.049 |
| Achromatopsia (no color) | #656565 | 0.084 |
Harmonies
Hue rotations in OKLCH that keep this color's lightness and chroma.
Complementary
The opposite hue (180°).
- #256C8A
#256C8A
oklch(50.1% 0.084 230)
- #8A5536
#8A5536
oklch(50.3% 0.084 50.3)
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 #256C8A, closest first.
Similar named colors
The eight closest entries in our named color list, with their ΔE distance.
- Sea Blue #047495 ΔE 0.026
- Ocean Blue #03719C ΔE 0.029
- Peacock Blue #016795 ΔE 0.030
- Denim #3B638C ΔE 0.032
- Muted Blue #3B719F ΔE 0.041
- Ocean #017B92 ΔE 0.044
- Deep Aqua #08787F ΔE 0.046
- Metallic Blue #4F738E ΔE 0.048
Use #256C8A 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.