#121D3E
Closest named color: Oxford Blue (#1B263B). oklch(24.1% 0.065 267.5), rgb(18, 29, 62).
Aa
White text reads best on this color (16.52:1).
About this color
#121D3E is a very dark, muted blue. In OKLCH its lightness is 24%, its chroma 0.065 and its hue 268°. 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 16.52:1.
| Hue family | Blues |
| Lightness | very dark (24%) |
| Chroma | muted (0.065) |
| Temperature | cool |
| Nearest name | Oxford Blue (#1B263B) |
| Black text | 1.27:1 |
| White text | 16.52:1 |
Values
| HEX | #121D3E |
| RGB | rgb(18, 29, 62) |
| HSL | hsl(225, 55%, 16%) |
| OKLCH | oklch(24.1% 0.065 267.5) |
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 #121D3E | 16.52:1 | AAA | Lc -105.8 | Preferred for body text |
| Black text on #121D3E | 1.27:1 | Fails | Lc 0.0 | Not readable |
| #121D3E text on white | 16.52:1 | AAA | Lc 103.3 | Preferred for body text |
| #121D3E 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
#F2F5FD
oklch(97% 0.011 269.6)
-
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
#ABC0F3
oklch(81% 0.076 267.3)
-
Step 400
400
#7F9DED
oklch(70.7% 0.122 267.6)
-
Step 500
500
#6083E8
oklch(63.2% 0.157 267.4)
-
Step 600
600
#486AD6
oklch(55.7% 0.17 267.5)
-
Step 700
700
#3A57B9
oklch(49.1% 0.158 267.8)
-
Step 800
800
#304896
oklch(42.8% 0.131 267.7)
-
Step 900
900
#2A3D77
oklch(37.7% 0.102 267.7)
-
Step 950
950 (this color)
#121D3E
oklch(24.1% 0.065 267.5)
#121D3E 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) | #0D213F | 0.013 |
| Deuteranopia (no green cones) | #061D3D | 0.014 |
| Tritanopia (no blue cones) | #00252A | 0.056 |
| Achromatopsia (no color) | #1F1F1F | 0.065 |
Harmonies
Hue rotations in OKLCH that keep this color's lightness and chroma.
Complementary
The opposite hue (180°).
- #121D3E
#121D3E
oklch(24.1% 0.065 267.5)
- #291E00
#291E00
oklch(24.2% 0.049 89.1)
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 #121D3E, 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 0.040
- Dark #1B2431 ΔE 0.041
- Navy Blue #001146 ΔE 0.049
- Jet #212529 ΔE 0.060
- Dark Indigo #1F0954 ΔE 0.064
- Space Cadet #2B2D42 ΔE 0.070
- Night Blue #040348 ΔE 0.075
Use #121D3E 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.