#121D39
Closest named color: Rich Black (#0D1B2A). oklch(23.7% 0.056 266.1), rgb(18, 29, 57).
Aa
White text reads best on this color (16.65:1).
About this color
#121D39 is a very dark, muted blue. In OKLCH its lightness is 24%, its chroma 0.056 and its hue 266°. Its hue sits on the cool side of the wheel. The nearest named color is Rich Black (#0D1B2A), ΔE 0.031 away. White text reads best on it, at 16.65:1.
| Hue family | Blues |
| Lightness | very dark (24%) |
| Chroma | muted (0.056) |
| Temperature | cool |
| Nearest name | Rich Black (#0D1B2A) |
| Black text | 1.26:1 |
| White text | 16.65:1 |
Values
| HEX | #121D39 |
| RGB | rgb(18, 29, 57) |
| HSL | hsl(223, 52%, 15%) |
| OKLCH | oklch(23.7% 0.056 266.1) |
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 #121D39 | 16.65:1 | AAA | Lc -105.9 | Preferred for body text |
| Black text on #121D39 | 1.26:1 | Fails | Lc 0.0 | Not readable |
| #121D39 text on white | 16.65:1 | AAA | Lc 103.5 | Preferred for body text |
| #121D39 text on black | 1.26:1 | 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
#E4EAF7
oklch(93.6% 0.019 266)
-
Step 200
200
#CED9F2
oklch(88.5% 0.036 266.7)
-
Step 300
300
#ADC0ED
oklch(80.9% 0.067 267)
-
Step 400
400
#819FE3
oklch(70.7% 0.106 265.6)
-
Step 500
500
#6385DB
oklch(63% 0.135 266.3)
-
Step 600
600
#4A6DC9
oklch(55.6% 0.148 266.1)
-
Step 700
700
#3C5BAE
oklch(49.2% 0.137 266.1)
-
Step 800
800
#314B8D
oklch(42.8% 0.114 265.7)
-
Step 900
900
#2B3F70
oklch(37.7% 0.088 265.7)
-
Step 950
950 (this color)
#121D39
oklch(23.7% 0.056 266.1)
#121D39 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) | #11203A | 0.010 |
| Deuteranopia (no green cones) | #0B1C38 | 0.010 |
| Tritanopia (no blue cones) | #002328 | 0.048 |
| Achromatopsia (no color) | #1E1E1E | 0.056 |
Harmonies
Hue rotations in OKLCH that keep this color's lightness and chroma.
Complementary
The opposite hue (180°).
- #121D39
#121D39
oklch(23.7% 0.056 266.1)
- #291D00
#291D00
oklch(23.9% 0.049 86.7)
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 #121D39, closest first.
Similar named colors
The eight closest entries in our named color list, with their ΔE distance.
- Rich Black #0D1B2A ΔE 0.031
- Oxford Blue #1B263B ΔE 0.035
- Dark #1B2431 ΔE 0.036
- Jet #212529 ΔE 0.053
- Navy Blue #001146 ΔE 0.054
- Space Cadet #2B2D42 ΔE 0.071
- Dark Indigo #1F0954 ΔE 0.072
- Night Blue #040348 ΔE 0.079
Use #121D39 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.