#121A3A
Closest named color: Rich Black (#0D1B2A). oklch(23% 0.063 270.3), rgb(18, 26, 58).
Aa
White text reads best on this color (17.00:1).
About this color
#121A3A is a very dark, muted blue. In OKLCH its lightness is 23%, its chroma 0.063 and its hue 270°. Its hue sits on the cool side of the wheel. The nearest named color is Rich Black (#0D1B2A), ΔE 0.034 away. White text reads best on it, at 17.00:1.
| Hue family | Blues |
| Lightness | very dark (23%) |
| Chroma | muted (0.063) |
| Temperature | cool |
| Nearest name | Rich Black (#0D1B2A) |
| Black text | 1.23:1 |
| White text | 17.00:1 |
Values
| HEX | #121A3A |
| RGB | rgb(18, 26, 58) |
| HSL | hsl(228, 53%, 15%) |
| OKLCH | oklch(23% 0.063 270.3) |
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 #121A3A | 17.00:1 | AAA | Lc -106.2 | Preferred for body text |
| Black text on #121A3A | 1.23:1 | Fails | Lc 0.0 | Not readable |
| #121A3A text on white | 17.00:1 | AAA | Lc 103.8 | Preferred for body text |
| #121A3A text on black | 1.23:1 | 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
#F3F5FC
oklch(97.1% 0.01 273.4)
-
Step 100
100
#E4EAF9
oklch(93.7% 0.021 268.4)
-
Step 200
200
#CED8F5
oklch(88.4% 0.041 270.4)
-
Step 300
300
#AEBFF1
oklch(80.9% 0.073 270.1)
-
Step 400
400
#849CEB
oklch(70.7% 0.119 270.3)
-
Step 500
500
#6781E4
oklch(63% 0.152 270.5)
-
Step 600
600
#5069D2
oklch(55.7% 0.164 270.2)
-
Step 700
700
#4156B6
oklch(49% 0.153 270.5)
-
Step 800
800
#354793
oklch(42.6% 0.127 270.2)
-
Step 900
900
#2E3C75
oklch(37.6% 0.099 270.6)
-
Step 950
950 (this color)
#121A3A
oklch(23% 0.063 270.3)
#121A3A 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) | #0A1E3B | 0.015 |
| Deuteranopia (no green cones) | #051B39 | 0.016 |
| Tritanopia (no blue cones) | #002127 | 0.054 |
| Achromatopsia (no color) | #1C1C1C | 0.063 |
Harmonies
Hue rotations in OKLCH that keep this color's lightness and chroma.
Complementary
The opposite hue (180°).
- #121A3A
#121A3A
oklch(23% 0.063 270.3)
- #251C00
#251C00
oklch(23.1% 0.047 92)
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 #121A3A, closest first.
Similar named colors
The eight closest entries in our named color list, with their ΔE distance.
- Rich Black #0D1B2A ΔE 0.034
- Oxford Blue #1B263B ΔE 0.044
- Dark #1B2431 ΔE 0.045
- Navy Blue #001146 ΔE 0.046
- Jet #212529 ΔE 0.063
- Dark Indigo #1F0954 ΔE 0.064
- Night Blue #040348 ΔE 0.070
- Midnight Purple #280137 ΔE 0.074
Use #121A3A 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.