#13172B
Closest named color: Rich Black (#0D1B2A). oklch(21.2% 0.04 273.9), rgb(19, 23, 43).
Aa
White text reads best on this color (17.71:1).
About this color
#13172B is a very dark, muted blue. In OKLCH its lightness is 21%, its chroma 0.040 and its hue 274°. Its hue sits on the cool side of the wheel. The nearest named color is Rich Black (#0D1B2A), ΔE 0.017 away. White text reads best on it, at 17.71:1.
| Hue family | Blues |
| Lightness | very dark (21%) |
| Chroma | muted (0.040) |
| Temperature | cool |
| Nearest name | Rich Black (#0D1B2A) |
| Black text | 1.18:1 |
| White text | 17.71:1 |
Values
| HEX | #13172B |
| RGB | rgb(19, 23, 43) |
| HSL | hsl(230, 39%, 12%) |
| OKLCH | oklch(21.2% 0.04 273.9) |
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 #13172B | 17.71:1 | AAA | Lc -106.7 | Preferred for body text |
| Black text on #13172B | 1.18:1 | Fails | Lc 0.0 | Not readable |
| #13172B text on white | 17.71:1 | AAA | Lc 104.5 | Preferred for body text |
| #13172B 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
#F4F5FA
oklch(97.1% 0.007 277.2)
-
Step 100
100
#E7E9F3
oklch(93.5% 0.014 277.1)
-
Step 200
200
#D3D8EB
oklch(88.4% 0.027 274.1)
-
Step 300
300
#B7BFE0
oklch(80.9% 0.047 274.6)
-
Step 400
400
#919ED0
oklch(70.7% 0.075 273.1)
-
Step 500
500
#7785C4
oklch(63.1% 0.096 273.8)
-
Step 600
600
#606EB1
oklch(55.7% 0.105 273.6)
-
Step 700
700
#505B98
oklch(49% 0.098 274.5)
-
Step 800
800
#414B7B
oklch(42.7% 0.081 273.6)
-
Step 900
900
#373F63
oklch(37.7% 0.063 273.5)
-
Step 950
950 (this color)
#13172B
oklch(21.2% 0.04 273.9)
#13172B 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) | #10192C | 0.008 |
| Deuteranopia (no green cones) | #0E172B | 0.008 |
| Tritanopia (no blue cones) | #0B1B1E | 0.036 |
| Achromatopsia (no color) | #181818 | 0.040 |
Harmonies
Hue rotations in OKLCH that keep this color's lightness and chroma.
Complementary
The opposite hue (180°).
- #13172B
#13172B
oklch(21.2% 0.04 273.9)
- #1F1802
#1F1802
oklch(21.2% 0.04 92.8)
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 #13172B, closest first.
Similar named colors
The eight closest entries in our named color list, with their ΔE distance.
- Rich Black #0D1B2A ΔE 0.017
- Dark #1B2431 ΔE 0.049
- Rich Navy #001219 ΔE 0.053
- Oxford Blue #1B263B ΔE 0.058
- Jet #212529 ΔE 0.059
- Navy Blue #001146 ΔE 0.063
- Almost Black #070D0D ΔE 0.071
- Midnight Purple #280137 ΔE 0.075
Use #13172B 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.