#121E3C
Closest named color: Oxford Blue (#1B263B). oklch(24.2% 0.06 265.7), rgb(18, 30, 60).
Aa
White text reads best on this color (16.44:1).
About this color
#121E3C is a very dark, muted blue. In OKLCH its lightness is 24%, its chroma 0.060 and its hue 266°. Its hue sits on the cool side of the wheel. The nearest named color is Oxford Blue (#1B263B), ΔE 0.032 away. White text reads best on it, at 16.44:1.
| Hue family | Blues |
| Lightness | very dark (24%) |
| Chroma | muted (0.060) |
| Temperature | cool |
| Nearest name | Oxford Blue (#1B263B) |
| Black text | 1.27:1 |
| White text | 16.44:1 |
Values
| HEX | #121E3C |
| RGB | rgb(18, 30, 60) |
| HSL | hsl(223, 54%, 15%) |
| OKLCH | oklch(24.2% 0.06 265.7) |
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 #121E3C | 16.44:1 | AAA | Lc -105.8 | Preferred for body text |
| Black text on #121E3C | 1.27:1 | Fails | Lc 0.0 | Not readable |
| #121E3C text on white | 16.44:1 | AAA | Lc 103.3 | Preferred for body text |
| #121E3C text on black | 1.27:1 | 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
#E3EAF8
oklch(93.6% 0.02 264.5)
-
Step 200
200
#CDD9F4
oklch(88.5% 0.039 266.5)
-
Step 300
300
#ABC0EF
oklch(80.8% 0.071 266)
-
Step 400
400
#7F9FE8
oklch(70.8% 0.113 265.5)
-
Step 500
500
#5F85E1
oklch(63.2% 0.145 265.5)
-
Step 600
600
#476CCE
oklch(55.5% 0.157 265.9)
-
Step 700
700
#385AB3
oklch(49.1% 0.147 265.6)
-
Step 800
800
#2F4A91
oklch(42.8% 0.122 265.8)
-
Step 900
900
#293E73
oklch(37.6% 0.095 265.8)
-
Step 950
950 (this color)
#121E3C
oklch(24.2% 0.06 265.7)
#121E3C 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) | #10213D | 0.010 |
| Deuteranopia (no green cones) | #0A1D3B | 0.011 |
| Tritanopia (no blue cones) | #00252A | 0.051 |
| Achromatopsia (no color) | #1F1F1F | 0.060 |
Harmonies
Hue rotations in OKLCH that keep this color's lightness and chroma.
Complementary
The opposite hue (180°).
- #121E3C
#121E3C
oklch(24.2% 0.06 265.7)
- #2A1E00
#2A1E00
oklch(24.3% 0.05 87.2)
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 #121E3C, closest first.
Similar named colors
The eight closest entries in our named color list, with their ΔE distance.
- Oxford Blue #1B263B ΔE 0.032
- Dark #1B2431 ΔE 0.036
- Rich Black #0D1B2A ΔE 0.036
- Navy Blue #001146 ΔE 0.053
- Jet #212529 ΔE 0.055
- Space Cadet #2B2D42 ΔE 0.067
- Dark Indigo #1F0954 ΔE 0.069
- Marine #042E60 ΔE 0.077
Use #121E3C 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.