#121D33
Closest named color: Rich Black (#0D1B2A). oklch(23.3% 0.046 263.1), rgb(18, 29, 51).
Aa
White text reads best on this color (16.80:1).
About this color
#121D33 is a very dark, muted blue. In OKLCH its lightness is 23%, its chroma 0.046 and its hue 263°. Its hue sits on the cool side of the wheel. The nearest named color is Rich Black (#0D1B2A), ΔE 0.020 away. White text reads best on it, at 16.80:1.
| Hue family | Blues |
| Lightness | very dark (23%) |
| Chroma | muted (0.046) |
| Temperature | cool |
| Nearest name | Rich Black (#0D1B2A) |
| Black text | 1.24:1 |
| White text | 16.80:1 |
Values
| HEX | #121D33 |
| RGB | rgb(18, 29, 51) |
| HSL | hsl(220, 48%, 14%) |
| OKLCH | oklch(23.3% 0.046 263.1) |
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 #121D33 | 16.80:1 | AAA | Lc -106.1 | Preferred for body text |
| Black text on #121D33 | 1.24:1 | Fails | Lc 0.0 | Not readable |
| #121D33 text on white | 16.80:1 | AAA | Lc 103.7 | Preferred for body text |
| #121D33 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
#F3F5FA
oklch(97% 0.007 268.5)
-
Step 100
100
#E4EAF5
oklch(93.6% 0.016 262.8)
-
Step 200
200
#CFDAEE
oklch(88.6% 0.03 262.5)
-
Step 300
300
#AFC1E4
oklch(80.9% 0.053 263.7)
-
Step 400
400
#84A1D7
oklch(70.8% 0.086 262.5)
-
Step 500
500
#6688CC
oklch(63% 0.11 263.3)
-
Step 600
600
#4D71B9
oklch(55.6% 0.12 263)
-
Step 700
700
#3E5EA0
oklch(49% 0.113 263.3)
-
Step 800
800
#344D81
oklch(42.6% 0.092 263.6)
-
Step 900
900
#2D4168
oklch(37.8% 0.072 262.8)
-
Step 950
950 (this color)
#121D33
oklch(23.3% 0.046 263.1)
#121D33 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) | #141F34 | 0.008 |
| Deuteranopia (no green cones) | #101C33 | 0.005 |
| Tritanopia (no blue cones) | #022225 | 0.042 |
| Achromatopsia (no color) | #1D1D1D | 0.046 |
Harmonies
Hue rotations in OKLCH that keep this color's lightness and chroma.
Complementary
The opposite hue (180°).
- #121D33
#121D33
oklch(23.3% 0.046 263.1)
- #281B01
#281B01
oklch(23.2% 0.046 82.7)
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 #121D33, closest first.
Similar named colors
The eight closest entries in our named color list, with their ΔE distance.
- Rich Black #0D1B2A ΔE 0.020
- Dark #1B2431 ΔE 0.031
- Oxford Blue #1B263B ΔE 0.036
- Jet #212529 ΔE 0.047
- Navy Blue #001146 ΔE 0.061
- Rich Navy #001219 ΔE 0.070
- Space Cadet #2B2D42 ΔE 0.073
- Dark Indigo #1F0954 ΔE 0.082
Use #121D33 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.