#121839
Closest named color: Rich Black (#0D1B2A). oklch(22.4% 0.064 272.5), rgb(18, 24, 57).
Aa
White text reads best on this color (17.27:1).
About this color
#121839 is a very dark, muted blue. In OKLCH its lightness is 22%, its chroma 0.064 and its hue 272°. 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 17.27:1.
| Hue family | Blues |
| Lightness | very dark (22%) |
| Chroma | muted (0.064) |
| Temperature | cool |
| Nearest name | Rich Black (#0D1B2A) |
| Black text | 1.21:1 |
| White text | 17.27:1 |
Values
| HEX | #121839 |
| RGB | rgb(18, 24, 57) |
| HSL | hsl(231, 52%, 15%) |
| OKLCH | oklch(22.4% 0.064 272.5) |
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 #121839 | 17.27:1 | AAA | Lc -106.4 | Preferred for body text |
| Black text on #121839 | 1.21:1 | Fails | Lc 0.0 | Not readable |
| #121839 text on white | 17.27:1 | AAA | Lc 104.0 | Preferred for body text |
| #121839 text on black | 1.21:1 | 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
#F3F5FD
oklch(97.1% 0.011 274.9)
-
Step 100
100
#E5E9F9
oklch(93.6% 0.022 274.7)
-
Step 200
200
#CFD8F6
oklch(88.5% 0.042 272.3)
-
Step 300
300
#B0BEF2
oklch(80.9% 0.075 272.9)
-
Step 400
400
#879BEC
oklch(70.7% 0.121 272.4)
-
Step 500
500
#6B80E6
oklch(63.2% 0.154 272.5)
-
Step 600
600
#5467D4
oklch(55.7% 0.168 272.4)
-
Step 700
700
#4555B8
oklch(49.2% 0.156 272.4)
-
Step 800
800
#384695
oklch(42.7% 0.13 272.2)
-
Step 900
900
#303B77
oklch(37.6% 0.103 272.7)
-
Step 950
950 (this color)
#121839
oklch(22.4% 0.064 272.5)
#121839 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) | #071C3A | 0.017 |
| Deuteranopia (no green cones) | #021938 | 0.021 |
| Tritanopia (no blue cones) | #001F25 | 0.056 |
| Achromatopsia (no color) | #1B1B1B | 0.064 |
Harmonies
Hue rotations in OKLCH that keep this color's lightness and chroma.
Complementary
The opposite hue (180°).
- #121839
#121839
oklch(22.4% 0.064 272.5)
- #231B00
#231B00
oklch(22.5% 0.046 93.6)
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 #121839, closest first.
Similar named colors
The eight closest entries in our named color list, with their ΔE distance.
- Rich Black #0D1B2A ΔE 0.034
- Navy Blue #001146 ΔE 0.043
- Oxford Blue #1B263B ΔE 0.050
- Dark #1B2431 ΔE 0.050
- Dark Indigo #1F0954 ΔE 0.063
- Night Blue #040348 ΔE 0.066
- Jet #212529 ΔE 0.067
- Midnight Purple #280137 ΔE 0.070
Use #121839 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.