#256D8F
Closest named color: Sea Blue (#047495). oklch(50.6% 0.088 233), rgb(37, 109, 143).
Aa
White text reads best on this color (5.73:1).
About this color
#256D8F is a medium-dark, moderately saturated blue. In OKLCH its lightness is 51%, its chroma 0.088 and its hue 233°. 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 5.73:1.
| Hue family | Blues |
| Lightness | medium-dark (51%) |
| Chroma | moderately saturated (0.088) |
| Temperature | cool |
| Nearest name | Sea Blue (#047495) |
| Black text | 3.66:1 |
| White text | 5.73:1 |
Values
| HEX | #256D8F |
| RGB | rgb(37, 109, 143) |
| HSL | hsl(199, 59%, 35%) |
| OKLCH | oklch(50.6% 0.088 233) |
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 #256D8F | 5.73:1 | AA | Lc -83.7 | Fine for body text |
| Black text on #256D8F | 3.66:1 | AA large text | Lc 25.7 | Dividers and decoration only |
| #256D8F text on white | 5.73:1 | AA | Lc 78.4 | Fine for body text |
| #256D8F text on black | 3.66:1 | AA large text | Lc -23.4 | 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
#F2F6F9
oklch(97.1% 0.006 239.8)
-
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
#A6C6D8
oklch(80.9% 0.043 232.7)
-
Step 400
400
#75A8C4
oklch(70.6% 0.068 233)
-
Step 500
500
#4E92B6
oklch(63% 0.088 233.6)
-
Step 600
600
#2E7CA2
oklch(55.6% 0.095 233.5)
-
Step 700
700 (this color)
#256D8F
oklch(50.6% 0.088 233)
-
Step 800
800
#1D5570
oklch(42.6% 0.073 233.2)
-
Step 900
900
#1E475B
oklch(37.8% 0.057 232.2)
-
Step 950
950
#132935
oklch(26.9% 0.036 234.1)
#256D8F 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) | #5C6C91 | 0.057 |
| Deuteranopia (no green cones) | #4E628E | 0.047 |
| Tritanopia (no blue cones) | #007678 | 0.055 |
| Achromatopsia (no color) | #666666 | 0.088 |
Harmonies
Hue rotations in OKLCH that keep this color's lightness and chroma.
Complementary
The opposite hue (180°).
- #256D8F
#256D8F
oklch(50.6% 0.088 233)
- #8C5632
#8C5632
oklch(50.6% 0.088 53.1)
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 #256D8F, 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 0.022
- Peacock Blue #016795 ΔE 0.028
- Denim #3B638C ΔE 0.032
- Muted Blue #3B719F ΔE 0.034
- Ocean #017B92 ΔE 0.041
- Metallic Blue #4F738E ΔE 0.045
- Dull Blue #49759C ΔE 0.046
Use #256D8F 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.