#256E91
Closest named color: Sea Blue (#047495). oklch(51% 0.089 233.5), rgb(37, 110, 145).
Aa
White text reads best on this color (5.64:1).
About this color
#256E91 is a medium-dark, moderately saturated blue. In OKLCH its lightness is 51%, its chroma 0.089 and its hue 233°. Its hue sits on the cool side of the wheel. The nearest named color is Sea Blue (#047495), ΔE 0.019 away. White text reads best on it, at 5.64:1.
| Hue family | Blues |
| Lightness | medium-dark (51%) |
| Chroma | moderately saturated (0.089) |
| Temperature | cool |
| Nearest name | Sea Blue (#047495) |
| Black text | 3.71:1 |
| White text | 5.64:1 |
Values
| HEX | #256E91 |
| RGB | rgb(37, 110, 145) |
| HSL | hsl(199, 59%, 36%) |
| OKLCH | oklch(51% 0.089 233.5) |
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 #256E91 | 5.64:1 | AA | Lc -83.2 | Fine for body text |
| Black text on #256E91 | 3.71:1 | AA large text | Lc 26.1 | Dividers and decoration only |
| #256E91 text on white | 5.64:1 | AA | Lc 77.9 | Fine for body text |
| #256E91 text on black | 3.71:1 | AA large text | Lc -23.8 | 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
#F2F6F9
oklch(97.1% 0.006 239.8)
-
Step 100
100
#E2EBF1
oklch(93.5% 0.013 236.6)
-
Step 200
200
#CADCE7
oklch(88.4% 0.025 234.5)
-
Step 300
300
#A6C6D9
oklch(80.9% 0.044 234.1)
-
Step 400
400
#75A8C5
oklch(70.6% 0.069 234)
-
Step 500
500
#4D92B7
oklch(63% 0.089 234.1)
-
Step 600
600
#2D7CA3
oklch(55.6% 0.097 234)
-
Step 700
700 (this color)
#256E91
oklch(51% 0.089 233.5)
-
Step 800
800
#1C5571
oklch(42.6% 0.074 233.9)
-
Step 900
900
#1E475B
oklch(37.8% 0.057 232.2)
-
Step 950
950
#132936
oklch(26.9% 0.037 236.3)
#256E91 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) | #5D6D93 | 0.057 |
| Deuteranopia (no green cones) | #4E6390 | 0.047 |
| Tritanopia (no blue cones) | #00777A | 0.055 |
| Achromatopsia (no color) | #676767 | 0.090 |
Harmonies
Hue rotations in OKLCH that keep this color's lightness and chroma.
Complementary
The opposite hue (180°).
- #256E91
#256E91
oklch(51% 0.089 233.5)
- #8E5731
#8E5731
oklch(51.1% 0.09 53.9)
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 #256E91, closest first.
Similar named colors
The eight closest entries in our named color list, with their ΔE distance.
- Sea Blue #047495 ΔE 0.019
- Ocean Blue #03719C ΔE 0.019
- Peacock Blue #016795 ΔE 0.029
- Muted Blue #3B719F ΔE 0.031
- Denim #3B638C ΔE 0.034
- Ocean #017B92 ΔE 0.039
- Dull Blue #49759C ΔE 0.043
- Metallic Blue #4F738E ΔE 0.044
Use #256E91 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.