#171928
Closest named color: Rich Black (#0D1B2A). oklch(21.9% 0.03 277.8), rgb(23, 25, 40).
Aa
White text reads best on this color (17.41:1).
About this color
#171928 is a very dark close to neutral grey. In OKLCH its lightness is 22%, its chroma 0.030. It has too little chroma to lean warm or cool. The nearest named color is Rich Black (#0D1B2A), ΔE 0.016 away. White text reads best on it, at 17.41:1.
| Hue family | Neutrals |
| Lightness | very dark (22%) |
| Chroma | close to neutral grey (0.030) |
| Temperature | neutral |
| Nearest name | Rich Black (#0D1B2A) |
| Black text | 1.20:1 |
| White text | 17.41:1 |
Values
| HEX | #171928 |
| RGB | rgb(23, 25, 40) |
| HSL | hsl(233, 27%, 12%) |
| OKLCH | oklch(21.9% 0.03 277.8) |
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 #171928 | 17.41:1 | AAA | Lc -106.5 | Preferred for body text |
| Black text on #171928 | 1.20:1 | Fails | Lc 0.0 | Not readable |
| #171928 text on white | 17.41:1 | AAA | Lc 104.3 | Preferred for body text |
| #171928 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
#D6D8E6
oklch(88.5% 0.019 279.5)
-
Step 300
300
#BBBFD8
oklch(80.9% 0.035 278.4)
-
Step 400
400
#989EC4
oklch(70.8% 0.056 277.8)
-
Step 500
500
#7F86B5
oklch(63.2% 0.071 277.6)
-
Step 600
600
#686FA1
oklch(55.6% 0.078 277.4)
-
Step 700
700
#575D8A
oklch(49.2% 0.072 277.6)
-
Step 800
800
#474C70
oklch(42.8% 0.06 277.5)
-
Step 900
900
#3B3F5A
oklch(37.6% 0.047 277.4)
-
Step 950
950 (this color)
#171928
oklch(21.9% 0.03 277.8)
#171928 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) | #141B29 | 0.008 |
| Deuteranopia (no green cones) | #131928 | 0.007 |
| Tritanopia (no blue cones) | #121C1E | 0.027 |
| Achromatopsia (no color) | #1A1A1A | 0.030 |
Harmonies
Hue rotations in OKLCH that keep this color's lightness and chroma.
Complementary
The opposite hue (180°).
- #171928
#171928
oklch(21.9% 0.03 277.8)
- #1E1A0A
#1E1A0A
oklch(21.8% 0.028 95.7)
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 #171928, 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 0.048
- Oxford Blue #1B263B ΔE 0.053
- Rich Navy #001219 ΔE 0.057
- Almost Black #070D0D ΔE 0.073
- Navy Blue #001146 ΔE 0.075
- Very Dark Purple #2A0134 ΔE 0.079
Use #171928 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.