#121D3D
Closest named color: Oxford Blue (#1B263B). oklch(24% 0.063 267.3), rgb(18, 29, 61).
Aa
White text reads best on this color (16.55:1).
About this color
#121D3D is a very dark, muted blue. In OKLCH its lightness is 24%, its chroma 0.063 and its hue 267°. Its hue sits on the cool side of the wheel. The nearest named color is Oxford Blue (#1B263B), ΔE 0.036 away. White text reads best on it, at 16.55:1.
| Hue family | Blues |
| Lightness | very dark (24%) |
| Chroma | muted (0.063) |
| Temperature | cool |
| Nearest name | Oxford Blue (#1B263B) |
| Black text | 1.26:1 |
| White text | 16.55:1 |
Values
| HEX | #121D3D |
| RGB | rgb(18, 29, 61) |
| HSL | hsl(225, 54%, 15%) |
| OKLCH | oklch(24% 0.063 267.3) |
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 #121D3D | 16.55:1 | AAA | Lc -105.8 | Preferred for body text |
| Black text on #121D3D | 1.26:1 | Fails | Lc 0.0 | Not readable |
| #121D3D text on white | 16.55:1 | AAA | Lc 103.4 | Preferred for body text |
| #121D3D text on black | 1.26:1 | 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
#F2F5FC
oklch(97% 0.01 267.4)
-
Step 100
100
#E3EAF9
oklch(93.6% 0.022 265.8)
-
Step 200
200
#CDD9F6
oklch(88.5% 0.042 267.7)
-
Step 300
300
#ABC0F2
oklch(80.9% 0.075 267)
-
Step 400
400
#7F9DEB
oklch(70.6% 0.12 267.3)
-
Step 500
500
#6083E5
oklch(63.1% 0.153 267.2)
-
Step 600
600
#486AD3
oklch(55.5% 0.166 267.3)
-
Step 700
700
#3A58B7
oklch(49.1% 0.154 267.3)
-
Step 800
800
#304894
oklch(42.6% 0.128 267.5)
-
Step 900
900
#2A3D76
oklch(37.6% 0.1 267.6)
-
Step 950
950 (this color)
#121D3D
oklch(24% 0.063 267.3)
#121D3D 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) | #0E213E | 0.013 |
| Deuteranopia (no green cones) | #071D3C | 0.013 |
| Tritanopia (no blue cones) | #00242A | 0.053 |
| Achromatopsia (no color) | #1F1F1F | 0.063 |
Harmonies
Hue rotations in OKLCH that keep this color's lightness and chroma.
Complementary
The opposite hue (180°).
- #121D3D
#121D3D
oklch(24% 0.063 267.3)
- #291D00
#291D00
oklch(23.9% 0.049 86.7)
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 #121D3D, closest first.
Similar named colors
The eight closest entries in our named color list, with their ΔE distance.
- Oxford Blue #1B263B ΔE 0.036
- Rich Black #0D1B2A ΔE 0.038
- Dark #1B2431 ΔE 0.040
- Navy Blue #001146 ΔE 0.050
- Jet #212529 ΔE 0.058
- Dark Indigo #1F0954 ΔE 0.065
- Space Cadet #2B2D42 ΔE 0.070
- Night Blue #040348 ΔE 0.075
Use #121D3D 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.