#121B3E
Closest named color: Rich Black (#0D1B2A). oklch(23.6% 0.068 269.7), rgb(18, 27, 62).
Aa
White text reads best on this color (16.77:1).
About this color
#121B3E is a very dark, muted blue. In OKLCH its lightness is 24%, its chroma 0.068 and its hue 270°. Its hue sits on the cool side of the wheel. The nearest named color is Rich Black (#0D1B2A), ΔE 0.040 away. White text reads best on it, at 16.77:1.
| Hue family | Blues |
| Lightness | very dark (24%) |
| Chroma | muted (0.068) |
| Temperature | cool |
| Nearest name | Rich Black (#0D1B2A) |
| Black text | 1.25:1 |
| White text | 16.77:1 |
Values
| HEX | #121B3E |
| RGB | rgb(18, 27, 62) |
| HSL | hsl(228, 55%, 16%) |
| OKLCH | oklch(23.6% 0.068 269.7) |
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 #121B3E | 16.77:1 | AAA | Lc -106.0 | Preferred for body text |
| Black text on #121B3E | 1.25:1 | Fails | Lc 0.0 | Not readable |
| #121B3E text on white | 16.77:1 | AAA | Lc 103.6 | Preferred for body text |
| #121B3E text on black | 1.25:1 | 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
#CDD8F8
oklch(88.4% 0.046 270.4)
-
Step 300
300
#ACBFF5
oklch(80.9% 0.079 269.5)
-
Step 400
400
#819CF1
oklch(70.8% 0.128 269.6)
-
Step 500
500
#6380EC
oklch(63% 0.165 269.9)
-
Step 600
600
#4C67DA
oklch(55.6% 0.178 269.8)
-
Step 700
700
#3D55BD
oklch(49.1% 0.165 269.6)
-
Step 800
800
#324699
oklch(42.7% 0.137 269.5)
-
Step 900
900
#2C3C7A
oklch(37.8% 0.107 269.8)
-
Step 950
950 (this color)
#121B3E
oklch(23.6% 0.068 269.7)
#121B3E 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) | #09203F | 0.017 |
| Deuteranopia (no green cones) | #021C3D | 0.019 |
| Tritanopia (no blue cones) | #002329 | 0.058 |
| Achromatopsia (no color) | #1D1D1D | 0.068 |
Harmonies
Hue rotations in OKLCH that keep this color's lightness and chroma.
Complementary
The opposite hue (180°).
- #121B3E
#121B3E
oklch(23.6% 0.068 269.7)
- #271D00
#271D00
oklch(23.6% 0.048 90.5)
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 #121B3E, closest first.
Similar named colors
The eight closest entries in our named color list, with their ΔE distance.
- Rich Black #0D1B2A ΔE 0.040
- Oxford Blue #1B263B ΔE 0.042
- Navy Blue #001146 ΔE 0.044
- Dark #1B2431 ΔE 0.047
- Dark Indigo #1F0954 ΔE 0.060
- Jet #212529 ΔE 0.065
- Night Blue #040348 ΔE 0.069
- Space Cadet #2B2D42 ΔE 0.076
Use #121B3E 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.