#121B15
Closest named color: Rich Black (#0D1B2A). oklch(21.1% 0.018 155.4), rgb(18, 27, 21).
Aa
White text reads best on this color (17.59:1).
About this color
#121B15 is a very dark close to neutral grey. In OKLCH its lightness is 21%, its chroma 0.018. It has too little chroma to lean warm or cool. The nearest named color is Rich Black (#0D1B2A), ΔE 0.042 away. White text reads best on it, at 17.59:1.
| Hue family | Neutrals |
| Lightness | very dark (21%) |
| Chroma | close to neutral grey (0.018) |
| Temperature | neutral |
| Nearest name | Rich Black (#0D1B2A) |
| Black text | 1.19:1 |
| White text | 17.59:1 |
Values
| HEX | #121B15 |
| RGB | rgb(18, 27, 21) |
| HSL | hsl(140, 20%, 9%) |
| OKLCH | oklch(21.1% 0.018 155.4) |
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 #121B15 | 17.59:1 | AAA | Lc -106.7 | Preferred for body text |
| Black text on #121B15 | 1.19:1 | Fails | Lc 0.0 | Not readable |
| #121B15 text on white | 17.59:1 | AAA | Lc 104.4 | Preferred for body text |
| #121B15 text on black | 1.19:1 | 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
#F4F6F5
oklch(97.1% 0.002 165.1)
-
Step 100
100
#E7EBE8
oklch(93.6% 0.006 153.8)
-
Step 200
200
#D3DBD6
oklch(88.4% 0.011 158.8)
-
Step 300
300
#B6C5BB
oklch(80.9% 0.021 156.7)
-
Step 400
400
#91A798
oklch(70.7% 0.033 155.7)
-
Step 500
500
#75927E
oklch(63.2% 0.044 154.8)
-
Step 600
600
#5E7C68
oklch(55.7% 0.046 155.4)
-
Step 700
700
#4D6856
oklch(49% 0.043 155.3)
-
Step 800
800
#3F5547
oklch(42.7% 0.036 156.6)
-
Step 900
900
#36463B
oklch(37.7% 0.028 154.9)
-
Step 950
950 (this color)
#121B15
oklch(21.1% 0.018 155.4)
#121B15 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) | #1B1A15 | 0.016 |
| Deuteranopia (no green cones) | #191815 | 0.016 |
| Tritanopia (no blue cones) | #111B19 | 0.008 |
| Achromatopsia (no color) | #191919 | 0.018 |
Harmonies
Hue rotations in OKLCH that keep this color's lightness and chroma.
Complementary
The opposite hue (180°).
- #121B15
#121B15
oklch(21.1% 0.018 155.4)
- #1E151C
#1E151C
oklch(21% 0.019 334.2)
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 #121B15, closest first.
Similar named colors
The eight closest entries in our named color list, with their ΔE distance.
- Rich Black #0D1B2A ΔE 0.042
- Rich Navy #001219 ΔE 0.051
- Jet #212529 ΔE 0.055
- Dark #1B2431 ΔE 0.059
- Almost Black #070D0D ΔE 0.060
- Dark Brown #341C02 ΔE 0.071
- Oxford Blue #1B263B ΔE 0.077
- Dark Forest Green #002D04 ΔE 0.081
Use #121B15 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.