#12172F
Closest named color: Rich Black (#0D1B2A). oklch(21.4% 0.048 272.9), rgb(18, 23, 47).
Aa
White text reads best on this color (17.65:1).
About this color
#12172F is a very dark, muted blue. In OKLCH its lightness is 21%, its chroma 0.048 and its hue 273°. Its hue sits on the cool side of the wheel. The nearest named color is Rich Black (#0D1B2A), ΔE 0.020 away. White text reads best on it, at 17.65:1.
| Hue family | Blues |
| Lightness | very dark (21%) |
| Chroma | muted (0.048) |
| Temperature | cool |
| Nearest name | Rich Black (#0D1B2A) |
| Black text | 1.18:1 |
| White text | 17.65:1 |
Values
| HEX | #12172F |
| RGB | rgb(18, 23, 47) |
| HSL | hsl(230, 45%, 13%) |
| OKLCH | oklch(21.4% 0.048 272.9) |
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 #12172F | 17.65:1 | AAA | Lc -106.6 | Preferred for body text |
| Black text on #12172F | 1.18:1 | Fails | Lc 0.0 | Not readable |
| #12172F text on white | 17.65:1 | AAA | Lc 104.4 | Preferred for body text |
| #12172F text on black | 1.18:1 | 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 950.
-
Step 50
50
#F4F5FB
oklch(97.1% 0.008 278.6)
-
Step 100
100
#E6E9F5
oklch(93.5% 0.016 274.8)
-
Step 200
200
#D2D8EF
oklch(88.5% 0.032 274.1)
-
Step 300
300
#B4BFE6
oklch(80.9% 0.056 272.7)
-
Step 400
400
#8E9DDA
oklch(70.8% 0.091 273.2)
-
Step 500
500
#7284CF
oklch(63.1% 0.115 272.5)
-
Step 600
600
#5B6CBC
oklch(55.5% 0.126 272.7)
-
Step 700
700
#4B5AA2
oklch(49.1% 0.116 272.6)
-
Step 800
800
#3E4A84
oklch(42.8% 0.097 272.9)
-
Step 900
900
#343E69
oklch(37.6% 0.075 272.4)
-
Step 950
950 (this color)
#12172F
oklch(21.4% 0.048 272.9)
#12172F 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) | #0D1A30 | 0.012 |
| Deuteranopia (no green cones) | #0A172E | 0.012 |
| Tritanopia (no blue cones) | #061C20 | 0.043 |
| Achromatopsia (no color) | #191919 | 0.048 |
Harmonies
Hue rotations in OKLCH that keep this color's lightness and chroma.
Complementary
The opposite hue (180°).
- #12172F
#12172F
oklch(21.4% 0.048 272.9)
- #201800
#201800
oklch(21.3% 0.044 92.3)
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 #12172F, closest first.
Similar named colors
The eight closest entries in our named color list, with their ΔE distance.
- Rich Black #0D1B2A ΔE 0.020
- Dark #1B2431 ΔE 0.049
- Navy Blue #001146 ΔE 0.056
- Oxford Blue #1B263B ΔE 0.056
- Rich Navy #001219 ΔE 0.058
- Jet #212529 ΔE 0.062
- Midnight Purple #280137 ΔE 0.072
- Dark Navy #000435 ΔE 0.073
Use #12172F 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.