#121D40
Closest named color: Oxford Blue (#1B263B). oklch(24.3% 0.068 267.9), rgb(18, 29, 64).
Aa
White text reads best on this color (16.46:1).
About this color
#121D40 is a very dark, muted blue. In OKLCH its lightness is 24%, its chroma 0.068 and its hue 268°. Its hue sits on the cool side of the wheel. The nearest named color is Oxford Blue (#1B263B), ΔE 0.037 away. White text reads best on it, at 16.46:1.
| Hue family | Blues |
| Lightness | very dark (24%) |
| Chroma | muted (0.068) |
| Temperature | cool |
| Nearest name | Oxford Blue (#1B263B) |
| Black text | 1.27:1 |
| White text | 16.46:1 |
Values
| HEX | #121D40 |
| RGB | rgb(18, 29, 64) |
| HSL | hsl(226, 56%, 16%) |
| OKLCH | oklch(24.3% 0.068 267.9) |
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 #121D40 | 16.46:1 | AAA | Lc -105.8 | Preferred for body text |
| Black text on #121D40 | 1.27:1 | Fails | Lc 0.0 | Not readable |
| #121D40 text on white | 16.46:1 | AAA | Lc 103.3 | Preferred for body text |
| #121D40 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
#E3EAFA
oklch(93.6% 0.023 266.9)
-
Step 200
200
#CCD9F8
oklch(88.5% 0.045 267.4)
-
Step 300
300
#AABFF6
oklch(80.8% 0.082 268.3)
-
Step 400
400
#7E9CF1
oklch(70.6% 0.129 268.2)
-
Step 500
500
#5F81EC
oklch(63% 0.165 268.2)
-
Step 600
600
#4768DB
oklch(55.6% 0.18 268)
-
Step 700
700
#3956BE
oklch(49.2% 0.167 268)
-
Step 800
800
#2F479A
oklch(42.8% 0.139 267.9)
-
Step 900
900
#293C7A
oklch(37.6% 0.108 268.1)
-
Step 950
950 (this color)
#121D40
oklch(24.3% 0.068 267.9)
#121D40 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) | #0B2141 | 0.014 |
| Deuteranopia (no green cones) | #041D3F | 0.016 |
| Tritanopia (no blue cones) | #00252B | 0.058 |
| Achromatopsia (no color) | #1F1F1F | 0.068 |
Harmonies
Hue rotations in OKLCH that keep this color's lightness and chroma.
Complementary
The opposite hue (180°).
- #121D40
#121D40
oklch(24.3% 0.068 267.9)
- #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 #121D40, closest first.
Similar named colors
The eight closest entries in our named color list, with their ΔE distance.
- Oxford Blue #1B263B ΔE 0.037
- Rich Black #0D1B2A ΔE 0.044
- Dark #1B2431 ΔE 0.044
- Navy Blue #001146 ΔE 0.048
- Dark Indigo #1F0954 ΔE 0.061
- Jet #212529 ΔE 0.062
- Space Cadet #2B2D42 ΔE 0.070
- Marine #042E60 ΔE 0.073
Use #121D40 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.