#121633
Closest named color: Rich Black (#0D1B2A). oklch(21.4% 0.057 274.7), rgb(18, 22, 51).
Aa
White text reads best on this color (17.67:1).
About this color
#121633 is a very dark, muted blue. In OKLCH its lightness is 21%, its chroma 0.057 and its hue 275°. Its hue sits on the cool side of the wheel. The nearest named color is Rich Black (#0D1B2A), ΔE 0.028 away. White text reads best on it, at 17.67:1.
| Hue family | Blues |
| Lightness | very dark (21%) |
| Chroma | muted (0.057) |
| Temperature | cool |
| Nearest name | Rich Black (#0D1B2A) |
| Black text | 1.18:1 |
| White text | 17.67:1 |
Values
| HEX | #121633 |
| RGB | rgb(18, 22, 51) |
| HSL | hsl(233, 48%, 14%) |
| OKLCH | oklch(21.4% 0.057 274.7) |
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 #121633 | 17.67:1 | AAA | Lc -106.6 | Preferred for body text |
| Black text on #121633 | 1.18:1 | Fails | Lc 0.0 | Not readable |
| #121633 text on white | 17.67:1 | AAA | Lc 104.4 | Preferred for body text |
| #121633 text on black | 1.18:1 | 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
#E6E9F7
oklch(93.6% 0.019 276.3)
-
Step 200
200
#D1D8F2
oklch(88.5% 0.037 273.7)
-
Step 300
300
#B3BEED
oklch(80.9% 0.068 274.5)
-
Step 400
400
#8D9BE4
oklch(70.7% 0.108 275)
-
Step 500
500
#7281DC
oklch(63.2% 0.137 274.7)
-
Step 600
600
#5B68C9
oklch(55.6% 0.149 274.7)
-
Step 700
700
#4B56AE
oklch(49.1% 0.139 274.7)
-
Step 800
800
#3D478D
oklch(42.7% 0.115 274.4)
-
Step 900
900
#343C70
oklch(37.6% 0.089 274.7)
-
Step 950
950 (this color)
#121633
oklch(21.4% 0.057 274.7)
#121633 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) | #091A34 | 0.017 |
| Deuteranopia (no green cones) | #051732 | 0.018 |
| Tritanopia (no blue cones) | #031C22 | 0.049 |
| Achromatopsia (no color) | #181818 | 0.057 |
Harmonies
Hue rotations in OKLCH that keep this color's lightness and chroma.
Complementary
The opposite hue (180°).
- #121633
#121633
oklch(21.4% 0.057 274.7)
- #201900
#201900
oklch(21.6% 0.044 94.9)
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 #121633, closest first.
Similar named colors
The eight closest entries in our named color list, with their ΔE distance.
- Rich Black #0D1B2A ΔE 0.028
- Navy Blue #001146 ΔE 0.048
- Dark #1B2431 ΔE 0.054
- Oxford Blue #1B263B ΔE 0.057
- Rich Navy #001219 ΔE 0.064
- Midnight Purple #280137 ΔE 0.068
- Jet #212529 ΔE 0.068
- Night Blue #040348 ΔE 0.068
Use #121633 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.