#171929
Closest named color: Rich Black (#0D1B2A). oklch(22% 0.031 278), rgb(23, 25, 41).
Aa
White text reads best on this color (17.39:1).
About this color
#171929 is a very dark, muted blue. In OKLCH its lightness is 22%, its chroma 0.031 and its hue 278°. Its hue sits on the cool side of the wheel. The nearest named color is Rich Black (#0D1B2A), ΔE 0.016 away. White text reads best on it, at 17.39:1.
| Hue family | Blues |
| Lightness | very dark (22%) |
| Chroma | muted (0.031) |
| Temperature | cool |
| Nearest name | Rich Black (#0D1B2A) |
| Black text | 1.20:1 |
| White text | 17.39:1 |
Values
| HEX | #171929 |
| RGB | rgb(23, 25, 41) |
| HSL | hsl(233, 28%, 13%) |
| OKLCH | oklch(22% 0.031 278) |
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 #171929 | 17.39:1 | AAA | Lc -106.5 | Preferred for body text |
| Black text on #171929 | 1.20:1 | Fails | Lc 0.0 | Not readable |
| #171929 text on white | 17.39:1 | AAA | Lc 104.2 | Preferred for body text |
| #171929 text on black | 1.20:1 | 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
#F4F5F9
oklch(97.1% 0.005 275)
-
Step 100
100
#E8E9F1
oklch(93.6% 0.011 280.5)
-
Step 200
200
#D5D8E7
oklch(88.4% 0.021 276.9)
-
Step 300
300
#BABFD9
oklch(80.9% 0.037 276.9)
-
Step 400
400
#979EC6
oklch(70.8% 0.059 277)
-
Step 500
500
#7E85B8
oklch(63.1% 0.077 277.9)
-
Step 600
600
#686EA3
oklch(55.5% 0.083 278.4)
-
Step 700
700
#565C8C
oklch(49% 0.077 277.7)
-
Step 800
800
#474B72
oklch(42.7% 0.065 278.8)
-
Step 900
900
#3B3F5C
oklch(37.7% 0.05 277.7)
-
Step 950
950 (this color)
#171929
oklch(22% 0.031 278)
#171929 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) | #141B2A | 0.008 |
| Deuteranopia (no green cones) | #131929 | 0.007 |
| Tritanopia (no blue cones) | #121C1F | 0.027 |
| Achromatopsia (no color) | #1A1A1A | 0.032 |
Harmonies
Hue rotations in OKLCH that keep this color's lightness and chroma.
Complementary
The opposite hue (180°).
- #171929
#171929
oklch(22% 0.031 278)
- #1E1B08
#1E1B08
oklch(22% 0.033 100.5)
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 #171929, closest first.
Similar named colors
The eight closest entries in our named color list, with their ΔE distance.
- Rich Black #0D1B2A ΔE 0.016
- Dark #1B2431 ΔE 0.040
- Jet #212529 ΔE 0.049
- Oxford Blue #1B263B ΔE 0.052
- Rich Navy #001219 ΔE 0.058
- Navy Blue #001146 ΔE 0.073
- Almost Black #070D0D ΔE 0.074
- Very Dark Purple #2A0134 ΔE 0.078
Use #171929 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.