#12171E
Closest named color: Rich Black (#0D1B2A). oklch(20.3% 0.016 256.8), rgb(18, 23, 30).
Aa
White text reads best on this color (17.99:1).
About this color
#12171E is a very dark close to neutral grey. In OKLCH its lightness is 20%, its chroma 0.016. It has too little chroma to lean warm or cool. The nearest named color is Rich Black (#0D1B2A), ΔE 0.025 away. White text reads best on it, at 17.99:1.
| Hue family | Neutrals |
| Lightness | very dark (20%) |
| Chroma | close to neutral grey (0.016) |
| Temperature | neutral |
| Nearest name | Rich Black (#0D1B2A) |
| Black text | 1.16:1 |
| White text | 17.99:1 |
Values
| HEX | #12171E |
| RGB | rgb(18, 23, 30) |
| HSL | hsl(215, 25%, 9%) |
| OKLCH | oklch(20.3% 0.016 256.8) |
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 #12171E | 17.99:1 | AAA | Lc -106.9 | Preferred for body text |
| Black text on #12171E | 1.16:1 | Fails | Lc 0.0 | Not readable |
| #12171E text on white | 17.99:1 | AAA | Lc 104.7 | Preferred for body text |
| #12171E text on black | 1.16:1 | 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
#F4F5F7
oklch(97% 0.003 264.5)
-
Step 100
100
#E7EAED
oklch(93.6% 0.005 247.9)
-
Step 200
200
#D5D9E0
oklch(88.4% 0.011 261.8)
-
Step 300
300
#B9C1CD
oklch(80.8% 0.019 258.4)
-
Step 400
400
#95A2B4
oklch(70.8% 0.03 256.5)
-
Step 500
500
#7B8BA1
oklch(63.2% 0.038 256.4)
-
Step 600
600
#64758C
oklch(55.7% 0.041 256)
-
Step 700
700
#536277
oklch(49.2% 0.039 256.8)
-
Step 800
800
#445061
oklch(42.8% 0.032 257.1)
-
Step 900
900
#39424F
oklch(37.6% 0.025 257.5)
-
Step 950
950 (this color)
#12171E
oklch(20.3% 0.016 256.8)
#12171E 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) | #15171E | 0.005 |
| Deuteranopia (no green cones) | #13161E | 0.004 |
| Tritanopia (no blue cones) | #0F1819 | 0.013 |
| Achromatopsia (no color) | #171717 | 0.016 |
Harmonies
Hue rotations in OKLCH that keep this color's lightness and chroma.
Complementary
The opposite hue (180°).
- #12171E
#12171E
oklch(20.3% 0.016 256.8)
- #1B160E
#1B160E
oklch(20.4% 0.017 79.2)
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 #12171E, closest first.
Similar named colors
The eight closest entries in our named color list, with their ΔE distance.
- Rich Black #0D1B2A ΔE 0.025
- Rich Navy #001219 ΔE 0.039
- Almost Black #070D0D ΔE 0.052
- Dark #1B2431 ΔE 0.056
- Jet #212529 ΔE 0.060
- Oxford Blue #1B263B ΔE 0.071
- Very Dark Brown #1D0200 ΔE 0.084
- Dark Brown #341C02 ΔE 0.086
Use #12171E 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.