#256FB3
Closest named color: Mid Blue (#276AB3). oklch(53.1% 0.129 250.2), rgb(37, 111, 179).
Aa
White text reads best on this color (5.24:1).
About this color
#256FB3 is a medium-dark, moderately saturated blue. In OKLCH its lightness is 53%, its chroma 0.129 and its hue 250°. Its hue sits on the cool side of the wheel. The nearest named color is Mid Blue (#276AB3), ΔE 0.014 away. White text reads best on it, at 5.24:1.
| Hue family | Blues |
| Lightness | medium-dark (53%) |
| Chroma | moderately saturated (0.129) |
| Temperature | cool |
| Nearest name | Mid Blue (#276AB3) |
| Black text | 4.00:1 |
| White text | 5.24:1 |
Values
| HEX | #256FB3 |
| RGB | rgb(37, 111, 179) |
| HSL | hsl(209, 66%, 42%) |
| OKLCH | oklch(53.1% 0.129 250.2) |
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 #256FB3 | 5.24:1 | AA | Lc -81.0 | Fine for body text |
| Black text on #256FB3 | 4.00:1 | AA large text | Lc 28.4 | Dividers and decoration only |
| #256FB3 text on white | 5.24:1 | AA | Lc 75.7 | Fine for body text |
| #256FB3 text on black | 4.00:1 | AA large text | Lc -26.1 | 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 600.
-
Step 50
50
#F2F6FB
oklch(97.2% 0.008 253.9)
-
Step 100
100
#E2EBF5
oklch(93.6% 0.017 250.8)
-
Step 200
200
#CADBEE
oklch(88.5% 0.032 251.1)
-
Step 300
300
#A5C4E5
oklch(80.9% 0.058 250.2)
-
Step 400
400
#74A5D8
oklch(70.7% 0.092 250.2)
-
Step 500
500
#4D8ECE
oklch(63.2% 0.118 249.9)
-
Step 600
600 (this color)
#256FB3
oklch(53.1% 0.129 250.2)
-
Step 700
700
#2063A1
oklch(49% 0.119 250.4)
-
Step 800
800
#1D5183
oklch(42.7% 0.1 250.7)
-
Step 900
900
#1E4469
oklch(37.8% 0.077 250)
-
Step 950
950
#12283D
oklch(27% 0.048 249)
#256FB3 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) | #4F73B6 | 0.041 |
| Deuteranopia (no green cones) | #3966B2 | 0.027 |
| Tritanopia (no blue cones) | #007F88 | 0.094 |
| Achromatopsia (no color) | #6C6C6C | 0.129 |
Harmonies
Hue rotations in OKLCH that keep this color's lightness and chroma.
Complementary
The opposite hue (180°).
- #256FB3
#256FB3
oklch(53.1% 0.129 250.2)
- #955E00
#955E00
oklch(53% 0.115 70.3)
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 #256FB3, closest first.
Similar named colors
The eight closest entries in our named color list, with their ΔE distance.
- Mid Blue #276AB3 ΔE 0.014
- French Blue #436BAD ΔE 0.025
- Flat Blue #3C73A8 ΔE 0.029
- Nice Blue #107AB0 ΔE 0.033
- Windows Blue #3778BF ΔE 0.034
- Muted Blue #3B719F ΔE 0.037
- Ocean Blue #03719C ΔE 0.042
- Dull Blue #49759C ΔE 0.053
Use #256FB3 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.