#121C31
Closest named color: Rich Black (#0D1B2A). oklch(22.9% 0.044 264), rgb(18, 28, 49).
Aa
White text reads best on this color (16.98:1).
About this color
#121C31 is a very dark, muted blue. In OKLCH its lightness is 23%, its chroma 0.044 and its hue 264°. Its hue sits on the cool side of the wheel. The nearest named color is Rich Black (#0D1B2A), ΔE 0.016 away. White text reads best on it, at 16.98:1.
| Hue family | Blues |
| Lightness | very dark (23%) |
| Chroma | muted (0.044) |
| Temperature | cool |
| Nearest name | Rich Black (#0D1B2A) |
| Black text | 1.23:1 |
| White text | 16.98:1 |
Values
| HEX | #121C31 |
| RGB | rgb(18, 28, 49) |
| HSL | hsl(221, 46%, 13%) |
| OKLCH | oklch(22.9% 0.044 264) |
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 #121C31 | 16.98:1 | AAA | Lc -106.2 | Preferred for body text |
| Black text on #121C31 | 1.23:1 | Fails | Lc 0.0 | Not readable |
| #121C31 text on white | 16.98:1 | AAA | Lc 103.8 | Preferred for body text |
| #121C31 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
#F3F5FA
oklch(97% 0.007 268.5)
-
Step 100
100
#E5EAF4
oklch(93.6% 0.015 264.5)
-
Step 200
200
#D0D9ED
oklch(88.5% 0.029 266.4)
-
Step 300
300
#B0C1E3
oklch(80.9% 0.052 264.2)
-
Step 400
400
#86A0D5
oklch(70.6% 0.083 264.1)
-
Step 500
500
#6988C9
oklch(63.1% 0.105 264.2)
-
Step 600
600
#5071B6
oklch(55.6% 0.114 263.7)
-
Step 700
700
#415E9D
oklch(49% 0.107 264.2)
-
Step 800
800
#364D7F
oklch(42.6% 0.088 264.3)
-
Step 900
900
#2F4166
oklch(37.8% 0.068 263.7)
-
Step 950
950 (this color)
#121C31
oklch(22.9% 0.044 264)
#121C31 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) | #141E32 | 0.008 |
| Deuteranopia (no green cones) | #101B31 | 0.005 |
| Tritanopia (no blue cones) | #042124 | 0.039 |
| Achromatopsia (no color) | #1C1C1C | 0.044 |
Harmonies
Hue rotations in OKLCH that keep this color's lightness and chroma.
Complementary
The opposite hue (180°).
- #121C31
#121C31
oklch(22.9% 0.044 264)
- #261B02
#261B02
oklch(23% 0.044 85.7)
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 #121C31, closest first.
Similar named colors
The eight closest entries in our named color list, with their ΔE distance.
- Rich Black #0D1B2A ΔE 0.016
- Dark #1B2431 ΔE 0.033
- Oxford Blue #1B263B ΔE 0.040
- Jet #212529 ΔE 0.048
- Navy Blue #001146 ΔE 0.062
- Rich Navy #001219 ΔE 0.066
- Space Cadet #2B2D42 ΔE 0.077
- Midnight Purple #280137 ΔE 0.083
Use #121C31 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.