#171F28
Closest named color: Rich Black (#0D1B2A). oklch(23.6% 0.021 251.7), rgb(23, 31, 40).
Aa
White text reads best on this color (16.62:1).
About this color
#171F28 is a very dark close to neutral grey. In OKLCH its lightness is 24%, its chroma 0.021. It has too little chroma to lean warm or cool. The nearest named color is Rich Black (#0D1B2A), ΔE 0.023 away. White text reads best on it, at 16.62:1.
| Hue family | Neutrals |
| Lightness | very dark (24%) |
| Chroma | close to neutral grey (0.021) |
| Temperature | neutral |
| Nearest name | Rich Black (#0D1B2A) |
| Black text | 1.26:1 |
| White text | 16.62:1 |
Values
| HEX | #171F28 |
| RGB | rgb(23, 31, 40) |
| HSL | hsl(212, 27%, 12%) |
| OKLCH | oklch(23.6% 0.021 251.7) |
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 #171F28 | 16.62:1 | AAA | Lc -106.0 | Preferred for body text |
| Black text on #171F28 | 1.26:1 | Fails | Lc 0.0 | Not readable |
| #171F28 text on white | 16.62:1 | AAA | Lc 103.6 | Preferred for body text |
| #171F28 text on black | 1.26:1 | 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
#F4F6F8
oklch(97.2% 0.003 247.9)
-
Step 100
100
#E6EAEF
oklch(93.5% 0.008 253.9)
-
Step 200
200
#D3DAE2
oklch(88.5% 0.013 251.6)
-
Step 300
300
#B5C2D1
oklch(80.9% 0.026 251.9)
-
Step 400
400
#8FA3B9
oklch(70.7% 0.039 250.9)
-
Step 500
500
#738CA8
oklch(63.1% 0.051 251.5)
-
Step 600
600
#5C7693
oklch(55.7% 0.055 251.5)
-
Step 700
700
#4B637D
oklch(49.1% 0.051 250.9)
-
Step 800
800
#3E5166
oklch(42.8% 0.042 251.3)
-
Step 900
900
#354353
oklch(37.7% 0.033 252.1)
-
Step 950
950 (this color)
#171F28
oklch(23.6% 0.021 251.7)
#171F28 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) | #1C1F28 | 0.008 |
| Deuteranopia (no green cones) | #1A1D28 | 0.008 |
| Tritanopia (no blue cones) | #122122 | 0.018 |
| Achromatopsia (no color) | #1E1E1E | 0.021 |
Harmonies
Hue rotations in OKLCH that keep this color's lightness and chroma.
Complementary
The opposite hue (180°).
- #171F28
#171F28
oklch(23.6% 0.021 251.7)
- #251D13
#251D13
oklch(23.7% 0.022 72.7)
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 #171F28, closest first.
Similar named colors
The eight closest entries in our named color list, with their ΔE distance.
- Rich Black #0D1B2A ΔE 0.023
- Dark #1B2431 ΔE 0.023
- Jet #212529 ΔE 0.029
- Oxford Blue #1B263B ΔE 0.040
- Rich Navy #001219 ΔE 0.069
- Space Cadet #2B2D42 ΔE 0.073
- Dark Brown #341C02 ΔE 0.077
- Gunmetal #293241 ΔE 0.080
Use #171F28 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.