#1256A5
Closest named color: Dusk Blue (#26538D). oklch(45.9% 0.143 255.9), rgb(18, 86, 165).
Aa
White text reads best on this color (7.24:1).
About this color
#1256A5 is a medium-dark, vivid blue. In OKLCH its lightness is 46%, its chroma 0.143 and its hue 256°. Its hue sits on the cool side of the wheel. The nearest named color is Dusk Blue (#26538D), ΔE 0.039 away. White text reads best on it, at 7.24:1.
| Hue family | Blues |
| Lightness | medium-dark (46%) |
| Chroma | vivid (0.143) |
| Temperature | cool |
| Nearest name | Dusk Blue (#26538D) |
| Black text | 2.90:1 |
| White text | 7.24:1 |
Values
| HEX | #1256A5 |
| RGB | rgb(18, 86, 165) |
| HSL | hsl(212, 80%, 36%) |
| OKLCH | oklch(45.9% 0.143 255.9) |
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 #1256A5 | 7.24:1 | AAA | Lc -89.5 | Fine for body text |
| Black text on #1256A5 | 2.90:1 | Fails | Lc 19.4 | Dividers and decoration only |
| #1256A5 text on white | 7.24:1 | AAA | Lc 84.6 | Fine for body text |
| #1256A5 text on black | 2.90:1 | Fails | Lc -17.4 | 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
#F1F6FC
oklch(97.1% 0.01 252.8)
-
Step 100
100
#E1EBF7
oklch(93.6% 0.019 252.9)
-
Step 200
200
#C9DBF3
oklch(88.5% 0.038 255.6)
-
Step 300
300
#A4C3ED
oklch(80.9% 0.069 256.1)
-
Step 400
400
#71A3E5
oklch(70.7% 0.111 255.7)
-
Step 500
500
#4B8ADD
oklch(63% 0.142 256.1)
-
Step 600
600
#2C72CB
oklch(55.5% 0.154 256.2)
-
Step 700
700 (this color)
#1256A5
oklch(45.9% 0.143 255.9)
-
Step 800
800
#1B4E8E
oklch(42.6% 0.119 256)
-
Step 900
900
#1D4271
oklch(37.8% 0.091 255.6)
-
Step 950
950
#122742
oklch(27.1% 0.057 255.5)
#1256A5 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) | #295EA8 | 0.029 |
| Deuteranopia (no green cones) | #0051A3 | 0.017 |
| Tritanopia (no blue cones) | #006975 | 0.108 |
| Achromatopsia (no color) | #575757 | 0.143 |
Harmonies
Hue rotations in OKLCH that keep this color's lightness and chroma.
Complementary
The opposite hue (180°).
- #1256A5
#1256A5
oklch(45.9% 0.143 255.9)
- #764F00
#764F00
oklch(45.9% 0.096 76.1)
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 #1256A5, closest first.
Similar named colors
The eight closest entries in our named color list, with their ΔE distance.
- Dusk Blue #26538D ΔE 0.039
- Denim Blue #3B5B92 ΔE 0.049
- Cobalt #1E488F ΔE 0.049
- Light Navy Blue #2E5A88 ΔE 0.054
- Light Navy #155084 ΔE 0.055
- Deep Sea Blue #015482 ΔE 0.059
- Peacock Blue #016795 ΔE 0.060
- Mid Blue #276AB3 ΔE 0.062
Use #1256A5 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.