#12356F
Closest named color: Marine Blue (#01386A). oklch(34% 0.109 260.1), rgb(18, 53, 111).
Aa
White text reads best on this color (11.90:1).
About this color
#12356F is a dark, moderately saturated blue. In OKLCH its lightness is 34%, its chroma 0.109 and its hue 260°. Its hue sits on the cool side of the wheel. The nearest named color is Marine Blue (#01386A), ΔE 0.016 away. White text reads best on it, at 11.90:1.
| Hue family | Blues |
| Lightness | dark (34%) |
| Chroma | moderately saturated (0.109) |
| Temperature | cool |
| Nearest name | Marine Blue (#01386A) |
| Black text | 1.76:1 |
| White text | 11.90:1 |
Values
| HEX | #12356F |
| RGB | rgb(18, 53, 111) |
| HSL | hsl(217, 72%, 25%) |
| OKLCH | oklch(34% 0.109 260.1) |
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 #12356F | 11.90:1 | AAA | Lc -100.5 | Preferred for body text |
| Black text on #12356F | 1.76:1 | Fails | Lc 0.0 | Not readable |
| #12356F text on white | 11.90:1 | AAA | Lc 96.9 | Preferred for body text |
| #12356F text on black | 1.76:1 | Fails | Lc 0.0 | Not readable |
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 900.
-
Step 50
50
#F1F6FD
oklch(97.1% 0.011 256.7)
-
Step 100
100
#E1EBFA
oklch(93.7% 0.023 258.4)
-
Step 200
200
#C8DAF8
oklch(88.4% 0.046 260.7)
-
Step 300
300
#A2C2F6
oklch(80.9% 0.082 260)
-
Step 400
400
#70A0F1
oklch(70.6% 0.13 260.4)
-
Step 500
500
#4986EC
oklch(63% 0.166 260.1)
-
Step 600
600
#2B6DDB
oklch(55.5% 0.182 260.2)
-
Step 700
700
#1E5BBE
oklch(49.2% 0.168 260)
-
Step 800
800
#1B4B9A
oklch(42.8% 0.139 260)
-
Step 900
900 (this color)
#12356F
oklch(34% 0.109 260.1)
-
Step 950
950
#112547
oklch(26.8% 0.069 260.3)
#12356F 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) | #123B71 | 0.018 |
| Deuteranopia (no green cones) | #00336E | 0.014 |
| Tritanopia (no blue cones) | #00434C | 0.085 |
| Achromatopsia (no color) | #373737 | 0.109 |
Harmonies
Hue rotations in OKLCH that keep this color's lightness and chroma.
Complementary
The opposite hue (180°).
- #12356F
#12356F
oklch(34% 0.109 260.1)
- #4B3300
#4B3300
oklch(34% 0.071 79.7)
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 #12356F, closest first.
Similar named colors
The eight closest entries in our named color list, with their ΔE distance.
- Marine Blue #01386A ΔE 0.016
- Marine #042E60 ΔE 0.035
- Twilight Blue #0A437A ΔE 0.043
- Prussian Blue #1D3557 ΔE 0.043
- Dark Blue Grey #1F3B4D ΔE 0.068
- Midnight Blue #191970 ΔE 0.069
- Midnight Green #073B4C ΔE 0.069
- Dark Grey Blue #29465B ΔE 0.075
Use #12356F 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.