#121F29
Closest named color: Rich Black (#0D1B2A). oklch(23.2% 0.027 242.4), rgb(18, 31, 41).
Aa
White text reads best on this color (16.74:1).
About this color
#121F29 is a very dark close to neutral grey. In OKLCH its lightness is 23%, its chroma 0.027. It has too little chroma to lean warm or cool. The nearest named color is Rich Black (#0D1B2A), ΔE 0.018 away. White text reads best on it, at 16.74:1.
| Hue family | Neutrals |
| Lightness | very dark (23%) |
| Chroma | close to neutral grey (0.027) |
| Temperature | neutral |
| Nearest name | Rich Black (#0D1B2A) |
| Black text | 1.25:1 |
| White text | 16.74:1 |
Values
| HEX | #121F29 |
| RGB | rgb(18, 31, 41) |
| HSL | hsl(206, 39%, 12%) |
| OKLCH | oklch(23.2% 0.027 242.4) |
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 #121F29 | 16.74:1 | AAA | Lc -106.1 | Preferred for body text |
| Black text on #121F29 | 1.25:1 | Fails | Lc 0.0 | Not readable |
| #121F29 text on white | 16.74:1 | AAA | Lc 103.6 | Preferred for body text |
| #121F29 text on black | 1.25:1 | 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
#F3F6F8
oklch(97.1% 0.004 236.5)
-
Step 100
100
#E5EBF0
oklch(93.7% 0.009 242.8)
-
Step 200
200
#D0DBE4
oklch(88.6% 0.017 242.5)
-
Step 300
300
#B0C4D4
oklch(81% 0.031 242.1)
-
Step 400
400
#86A5BE
oklch(70.7% 0.05 242.8)
-
Step 500
500
#678FAE
oklch(63.2% 0.064 242.3)
-
Step 600
600
#4D7899
oklch(55.5% 0.07 242.6)
-
Step 700
700
#3E6583
oklch(49.1% 0.066 242.8)
-
Step 800
800
#34536A
oklch(42.8% 0.053 241.7)
-
Step 900
900
#2D4456
oklch(37.6% 0.042 242.8)
-
Step 950
950 (this color)
#121F29
oklch(23.2% 0.027 242.4)
#121F29 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) | #1B1F29 | 0.014 |
| Deuteranopia (no green cones) | #181D29 | 0.011 |
| Tritanopia (no blue cones) | #082122 | 0.022 |
| Achromatopsia (no color) | #1E1E1E | 0.027 |
Harmonies
Hue rotations in OKLCH that keep this color's lightness and chroma.
Complementary
The opposite hue (180°).
- #121F29
#121F29
oklch(23.2% 0.027 242.4)
- #271B10
#271B10
oklch(23.4% 0.027 63.4)
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 #121F29, closest first.
Similar named colors
The eight closest entries in our named color list, with their ΔE distance.
- Rich Black #0D1B2A ΔE 0.018
- Dark #1B2431 ΔE 0.027
- Jet #212529 ΔE 0.034
- Oxford Blue #1B263B ΔE 0.042
- Rich Navy #001219 ΔE 0.064
- Space Cadet #2B2D42 ΔE 0.076
- Navy Blue #001146 ΔE 0.081
- Almost Black #070D0D ΔE 0.083
Use #121F29 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.