#256DA4
Closest named color: Ocean Blue (#03719C). oklch(51.7% 0.112 245.7), rgb(37, 109, 164).
Aa
White text reads best on this color (5.52:1).
About this color
#256DA4 is a medium-dark, moderately saturated blue. In OKLCH its lightness is 52%, its chroma 0.112 and its hue 246°. Its hue sits on the cool side of the wheel. The nearest named color is Ocean Blue (#03719C), ΔE 0.023 away. White text reads best on it, at 5.52:1.
| Hue family | Blues |
| Lightness | medium-dark (52%) |
| Chroma | moderately saturated (0.112) |
| Temperature | cool |
| Nearest name | Ocean Blue (#03719C) |
| Black text | 3.80:1 |
| White text | 5.52:1 |
Values
| HEX | #256DA4 |
| RGB | rgb(37, 109, 164) |
| HSL | hsl(206, 63%, 39%) |
| OKLCH | oklch(51.7% 0.112 245.7) |
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 #256DA4 | 5.52:1 | AA | Lc -82.6 | Fine for body text |
| Black text on #256DA4 | 3.80:1 | AA large text | Lc 26.8 | Dividers and decoration only |
| #256DA4 text on white | 5.52:1 | AA | Lc 77.2 | Fine for body text |
| #256DA4 text on black | 3.80:1 | AA large text | Lc -24.5 | 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
#F2F6FA
oklch(97.1% 0.007 247.9)
-
Step 100
100
#E2EBF4
oklch(93.6% 0.016 248)
-
Step 200
200
#CADCEC
oklch(88.6% 0.029 244.9)
-
Step 300
300
#A5C5E2
oklch(81% 0.054 245.9)
-
Step 400
400
#72A6D4
oklch(70.6% 0.087 246.1)
-
Step 500
500
#4B8FC8
oklch(63% 0.111 246.1)
-
Step 600
600
#2A79B5
oklch(55.7% 0.12 245.6)
-
Step 700
700 (this color)
#256DA4
oklch(51.7% 0.112 245.7)
-
Step 800
800
#1A537E
oklch(42.8% 0.092 245.5)
-
Step 900
900
#1C4565
oklch(37.7% 0.072 245)
-
Step 950
950
#12283B
oklch(26.9% 0.045 246.6)
#256DA4 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) | #546FA6 | 0.046 |
| Deuteranopia (no green cones) | #4263A3 | 0.034 |
| Tritanopia (no blue cones) | #007A81 | 0.079 |
| Achromatopsia (no color) | #696969 | 0.112 |
Harmonies
Hue rotations in OKLCH that keep this color's lightness and chroma.
Complementary
The opposite hue (180°).
- #256DA4
#256DA4
oklch(51.7% 0.112 245.7)
- #93590A
#93590A
oklch(51.8% 0.112 65.9)
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 #256DA4, closest first.
Similar named colors
The eight closest entries in our named color list, with their ΔE distance.
- Ocean Blue #03719C ΔE 0.023
- Muted Blue #3B719F ΔE 0.024
- Mid Blue #276AB3 ΔE 0.027
- Flat Blue #3C73A8 ΔE 0.028
- French Blue #436BAD ΔE 0.031
- Peacock Blue #016795 ΔE 0.034
- Sea Blue #047495 ΔE 0.037
- Nice Blue #107AB0 ΔE 0.038
Use #256DA4 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.