#121F1F
Closest named color: Rich Black (#0D1B2A). oklch(22.7% 0.018 195.9), rgb(18, 31, 31).
Aa
White text reads best on this color (16.91:1).
About this color
#121F1F is a very dark close to neutral grey. In OKLCH its lightness is 23%, its chroma 0.018. It has too little chroma to lean warm or cool. The nearest named color is Rich Black (#0D1B2A), ΔE 0.031 away. White text reads best on it, at 16.91:1.
| Hue family | Neutrals |
| Lightness | very dark (23%) |
| Chroma | close to neutral grey (0.018) |
| Temperature | neutral |
| Nearest name | Rich Black (#0D1B2A) |
| Black text | 1.24:1 |
| White text | 16.91:1 |
Values
| HEX | #121F1F |
| RGB | rgb(18, 31, 31) |
| HSL | hsl(180, 27%, 10%) |
| OKLCH | oklch(22.7% 0.018 195.9) |
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 #121F1F | 16.91:1 | AAA | Lc -106.2 | Preferred for body text |
| Black text on #121F1F | 1.24:1 | Fails | Lc 0.0 | Not readable |
| #121F1F text on white | 16.91:1 | AAA | Lc 103.8 | Preferred for body text |
| #121F1F text on black | 1.24:1 | 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
#F3F6F6
oklch(97.1% 0.003 197.1)
-
Step 100
100
#E5EBEB
oklch(93.6% 0.006 197)
-
Step 200
200
#D1DCDC
oklch(88.6% 0.012 196.9)
-
Step 300
300
#B1C5C5
oklch(80.8% 0.022 196.7)
-
Step 400
400
#88A8A7
oklch(70.7% 0.035 194)
-
Step 500
500
#6A9292
oklch(63.1% 0.044 196.1)
-
Step 600
600
#517C7C
oklch(55.5% 0.048 195.9)
-
Step 700
700
#416969
oklch(49.1% 0.045 195.8)
-
Step 800
800
#365555
oklch(42.5% 0.037 195.9)
-
Step 900
900
#2F4646
oklch(37.5% 0.028 196)
-
Step 950
950 (this color)
#121F1F
oklch(22.7% 0.018 195.9)
#121F1F 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) | #1D1E1F | 0.018 |
| Deuteranopia (no green cones) | #1B1C1F | 0.018 |
| Tritanopia (no blue cones) | #0D201F | 0.007 |
| Achromatopsia (no color) | #1D1D1D | 0.018 |
Harmonies
Hue rotations in OKLCH that keep this color's lightness and chroma.
Complementary
The opposite hue (180°).
- #121F1F
#121F1F
oklch(22.7% 0.018 195.9)
- #241919
#241919
oklch(22.7% 0.018 18.5)
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 #121F1F, closest first.
Similar named colors
The eight closest entries in our named color list, with their ΔE distance.
- Rich Black #0D1B2A ΔE 0.031
- Jet #212529 ΔE 0.038
- Dark #1B2431 ΔE 0.039
- Oxford Blue #1B263B ΔE 0.057
- Rich Navy #001219 ΔE 0.061
- Dark Brown #341C02 ΔE 0.072
- Almost Black #070D0D ΔE 0.075
- Dark Forest Green #002D04 ΔE 0.079
Use #121F1F 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.