#12556D
Closest named color: Petrol (#005F6A). oklch(42.1% 0.074 227.5), rgb(18, 85, 109).
Aa
White text reads best on this color (8.24:1).
About this color
#12556D is a dark, moderately saturated teal or cyan. In OKLCH its lightness is 42%, its chroma 0.074 and its hue 227°. Its hue sits on the cool side of the wheel. The nearest named color is Petrol (#005F6A), ΔE 0.034 away. White text reads best on it, at 8.24:1.
| Hue family | Teals and cyans |
| Lightness | dark (42%) |
| Chroma | moderately saturated (0.074) |
| Temperature | cool |
| Nearest name | Petrol (#005F6A) |
| Black text | 2.54:1 |
| White text | 8.24:1 |
Values
| HEX | #12556D |
| RGB | rgb(18, 85, 109) |
| HSL | hsl(196, 72%, 25%) |
| OKLCH | oklch(42.1% 0.074 227.5) |
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 #12556D | 8.24:1 | AAA | Lc -92.8 | Preferred for body text |
| Black text on #12556D | 2.54:1 | Fails | Lc 15.8 | Dividers and decoration only |
| #12556D text on white | 8.24:1 | AAA | Lc 88.2 | Fine for body text |
| #12556D text on black | 2.54:1 | Fails | Lc -14.0 | 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 800.
-
Step 50
50
#F2F6F8
oklch(97.1% 0.005 228.8)
-
Step 100
100
#E2ECF0
oklch(93.7% 0.012 223.5)
-
Step 200
200
#C9DDE6
oklch(88.5% 0.025 226.5)
-
Step 300
300
#A4C7D7
oklch(80.9% 0.044 227.3)
-
Step 400
400
#71AAC3
oklch(70.8% 0.07 227.4)
-
Step 500
500
#4794B3
oklch(63% 0.089 227.1)
-
Step 600
600
#227E9F
oklch(55.6% 0.096 227.1)
-
Step 700
700
#126A88
oklch(49% 0.09 227.4)
-
Step 800
800 (this color)
#12556D
oklch(42.1% 0.074 227.5)
-
Step 900
900
#1A485A
oklch(37.9% 0.058 227.3)
-
Step 950
950
#112A34
oklch(27% 0.036 226.6)
#12556D 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) | #48536E | 0.054 |
| Deuteranopia (no green cones) | #3C4B6D | 0.046 |
| Tritanopia (no blue cones) | #005C5D | 0.041 |
| Achromatopsia (no color) | #4F4F4F | 0.075 |
Harmonies
Hue rotations in OKLCH that keep this color's lightness and chroma.
Complementary
The opposite hue (180°).
- #12556D
#12556D
oklch(42.1% 0.074 227.5)
- #6E4028
#6E4028
oklch(42.1% 0.074 47.5)
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 #12556D, closest first.
Similar named colors
The eight closest entries in our named color list, with their ΔE distance.
- Petrol #005F6A ΔE 0.034
- Deep Teal #00555A ΔE 0.035
- Deep Sea Blue #015482 ΔE 0.037
- Light Navy #155084 ΔE 0.046
- Dark Grey Blue #29465B ΔE 0.049
- Dark Slate Gray #2F4F4F ΔE 0.050
- YInMn Blue #415A77 ΔE 0.051
- Light Navy Blue #2E5A88 ΔE 0.053
Use #12556D 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.