#256DB8
Closest named color: Mid Blue (#276AB3). oklch(53% 0.137 252.8), rgb(37, 109, 184).
Aa
White text reads best on this color (5.30:1).
About this color
#256DB8 is a medium-dark, moderately saturated blue. In OKLCH its lightness is 53%, its chroma 0.137 and its hue 253°. Its hue sits on the cool side of the wheel. The nearest named color is Mid Blue (#276AB3), ΔE 0.010 away. White text reads best on it, at 5.30:1.
| Hue family | Blues |
| Lightness | medium-dark (53%) |
| Chroma | moderately saturated (0.137) |
| Temperature | cool |
| Nearest name | Mid Blue (#276AB3) |
| Black text | 3.95:1 |
| White text | 5.30:1 |
Values
| HEX | #256DB8 |
| RGB | rgb(37, 109, 184) |
| HSL | hsl(211, 67%, 43%) |
| OKLCH | oklch(53% 0.137 252.8) |
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 #256DB8 | 5.30:1 | AA | Lc -81.3 | Fine for body text |
| Black text on #256DB8 | 3.95:1 | AA large text | Lc 28.1 | Dividers and decoration only |
| #256DB8 text on white | 5.30:1 | AA | Lc 76.0 | Fine for body text |
| #256DB8 text on black | 3.95:1 | AA large text | Lc -25.8 | 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 600.
-
Step 50
50
#F2F6FB
oklch(97.2% 0.008 253.9)
-
Step 100
100
#E2EBF6
oklch(93.7% 0.018 253.3)
-
Step 200
200
#CADBF0
oklch(88.5% 0.034 253.7)
-
Step 300
300
#A5C4E8
oklch(81% 0.061 252.4)
-
Step 400
400
#73A4DD
oklch(70.7% 0.099 252.9)
-
Step 500
500
#4D8CD3
oklch(63% 0.126 252.9)
-
Step 600
600 (this color)
#256DB8
oklch(53% 0.137 252.8)
-
Step 700
700
#2062A6
oklch(49.1% 0.127 252.6)
-
Step 800
800
#1D5087
oklch(42.7% 0.106 253)
-
Step 900
900
#1E436C
oklch(37.7% 0.082 252.9)
-
Step 950
950
#12273F
oklch(26.9% 0.053 253.1)
#256DB8 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) | #4873BB | 0.037 |
| Deuteranopia (no green cones) | #3065B7 | 0.022 |
| Tritanopia (no blue cones) | #007F89 | 0.103 |
| Achromatopsia (no color) | #6B6B6B | 0.137 |
Harmonies
Hue rotations in OKLCH that keep this color's lightness and chroma.
Complementary
The opposite hue (180°).
- #256DB8
#256DB8
oklch(53% 0.137 252.8)
- #935F00
#935F00
oklch(52.9% 0.113 72.3)
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 #256DB8, closest first.
Similar named colors
The eight closest entries in our named color list, with their ΔE distance.
- Mid Blue #276AB3 ΔE 0.010
- French Blue #436BAD ΔE 0.028
- Windows Blue #3778BF ΔE 0.036
- Flat Blue #3C73A8 ΔE 0.038
- Nice Blue #107AB0 ΔE 0.042
- Muted Blue #3B719F ΔE 0.046
- Ocean Blue #03719C ΔE 0.051
- Peacock Blue #016795 ΔE 0.060
Use #256DB8 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.