#121B33
Closest named color: Rich Black (#0D1B2A). oklch(22.7% 0.049 267), rgb(18, 27, 51).
Aa
White text reads best on this color (17.06:1).
About this color
#121B33 is a very dark, muted blue. In OKLCH its lightness is 23%, its chroma 0.049 and its hue 267°. 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 17.06:1.
| Hue family | Blues |
| Lightness | very dark (23%) |
| Chroma | muted (0.049) |
| Temperature | cool |
| Nearest name | Rich Black (#0D1B2A) |
| Black text | 1.23:1 |
| White text | 17.06:1 |
Values
| HEX | #121B33 |
| RGB | rgb(18, 27, 51) |
| HSL | hsl(224, 48%, 14%) |
| OKLCH | oklch(22.7% 0.049 267) |
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 #121B33 | 17.06:1 | AAA | Lc -106.3 | Preferred for body text |
| Black text on #121B33 | 1.23:1 | Fails | Lc 0.0 | Not readable |
| #121B33 text on white | 17.06:1 | AAA | Lc 103.9 | Preferred for body text |
| #121B33 text on black | 1.23:1 | 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
#F3F5FB
oklch(97% 0.008 271.3)
-
Step 100
100
#E5EAF5
oklch(93.6% 0.016 266.3)
-
Step 200
200
#D0D9EF
oklch(88.5% 0.032 268)
-
Step 300
300
#B0C0E7
oklch(80.9% 0.058 267.6)
-
Step 400
400
#879FDB
oklch(70.7% 0.092 267.3)
-
Step 500
500
#6986D1
oklch(63.1% 0.118 267)
-
Step 600
600
#516FBE
oklch(55.7% 0.128 266.6)
-
Step 700
700
#425CA4
oklch(49.1% 0.119 267)
-
Step 800
800
#374C85
oklch(42.8% 0.098 267)
-
Step 900
900
#2F3F6A
oklch(37.6% 0.077 267.2)
-
Step 950
950 (this color)
#121B33
oklch(22.7% 0.049 267)
#121B33 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) | #111D34 | 0.007 |
| Deuteranopia (no green cones) | #0D1A32 | 0.009 |
| Tritanopia (no blue cones) | #032024 | 0.043 |
| Achromatopsia (no color) | #1C1C1C | 0.049 |
Harmonies
Hue rotations in OKLCH that keep this color's lightness and chroma.
Complementary
The opposite hue (180°).
- #121B33
#121B33
oklch(22.7% 0.049 267)
- #261A00
#261A00
oklch(22.7% 0.046 85)
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 #121B33, 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 0.037
- Oxford Blue #1B263B ΔE 0.042
- Jet #212529 ΔE 0.053
- Navy Blue #001146 ΔE 0.057
- Rich Navy #001219 ΔE 0.068
- Dark Indigo #1F0954 ΔE 0.078
- Midnight Purple #280137 ΔE 0.079
Use #121B33 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.