#12539A
Closest named color: Dusk Blue (#26538D). oklch(44.4% 0.132 254.7), rgb(18, 83, 154).
Aa
White text reads best on this color (7.69:1).
About this color
#12539A is a dark, moderately saturated blue. In OKLCH its lightness is 44%, its chroma 0.132 and its hue 255°. Its hue sits on the cool side of the wheel. The nearest named color is Dusk Blue (#26538D), ΔE 0.024 away. White text reads best on it, at 7.69:1.
| Hue family | Blues |
| Lightness | dark (44%) |
| Chroma | moderately saturated (0.132) |
| Temperature | cool |
| Nearest name | Dusk Blue (#26538D) |
| Black text | 2.72:1 |
| White text | 7.69:1 |
Values
| HEX | #12539A |
| RGB | rgb(18, 83, 154) |
| HSL | hsl(211, 79%, 34%) |
| OKLCH | oklch(44.4% 0.132 254.7) |
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 #12539A | 7.69:1 | AAA | Lc -91.0 | Preferred for body text |
| Black text on #12539A | 2.72:1 | Fails | Lc 17.8 | Dividers and decoration only |
| #12539A text on white | 7.69:1 | AAA | Lc 86.2 | Fine for body text |
| #12539A text on black | 2.72:1 | Fails | Lc -15.9 | 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 800.
-
Step 50
50
#F1F6FC
oklch(97.1% 0.01 252.8)
-
Step 100
100
#E0EBF9
oklch(93.6% 0.022 254.4)
-
Step 200
200
#C7DBF6
oklch(88.5% 0.043 255.9)
-
Step 300
300
#9FC4F2
oklch(81% 0.077 254.1)
-
Step 400
400
#69A3EC
oklch(70.6% 0.124 254.8)
-
Step 500
500
#3D8AE6
oklch(63.1% 0.158 254.8)
-
Step 600
600
#1572D4
oklch(55.6% 0.171 254.7)
-
Step 700
700
#025FB8
oklch(49.2% 0.159 254.7)
-
Step 800
800 (this color)
#12539A
oklch(44.4% 0.132 254.7)
-
Step 900
900
#144276
oklch(37.8% 0.102 254.3)
-
Step 950
950
#0D2745
oklch(27% 0.064 254)
#12539A 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) | #2D599D | 0.028 |
| Deuteranopia (no green cones) | #0A4D99 | 0.018 |
| Tritanopia (no blue cones) | #00646F | 0.098 |
| Achromatopsia (no color) | #535353 | 0.132 |
Harmonies
Hue rotations in OKLCH that keep this color's lightness and chroma.
Complementary
The opposite hue (180°).
- #12539A
#12539A
oklch(44.4% 0.132 254.7)
- #724B00
#724B00
oklch(44.6% 0.094 74.9)
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 #12539A, closest first.
Similar named colors
The eight closest entries in our named color list, with their ΔE distance.
- Dusk Blue #26538D ΔE 0.024
- Cobalt #1E488F ΔE 0.033
- Light Navy #155084 ΔE 0.036
- Deep Sea Blue #015482 ΔE 0.042
- Light Navy Blue #2E5A88 ΔE 0.044
- Denim Blue #3B5B92 ΔE 0.047
- Peacock Blue #016795 ΔE 0.061
- Twilight #4E518B ΔE 0.063
Use #12539A 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.