#121D2B
Closest named color: Rich Black (#0D1B2A). oklch(22.8% 0.032 254.9), rgb(18, 29, 43).
Aa
White text reads best on this color (16.98:1).
About this color
#121D2B is a very dark, muted blue. In OKLCH its lightness is 23%, its chroma 0.032 and its hue 255°. Its hue sits on the cool side of the wheel. The nearest named color is Rich Black (#0D1B2A), ΔE 0.011 away. White text reads best on it, at 16.98:1.
| Hue family | Blues |
| Lightness | very dark (23%) |
| Chroma | muted (0.032) |
| Temperature | cool |
| Nearest name | Rich Black (#0D1B2A) |
| Black text | 1.23:1 |
| White text | 16.98:1 |
Values
| HEX | #121D2B |
| RGB | rgb(18, 29, 43) |
| HSL | hsl(214, 41%, 12%) |
| OKLCH | oklch(22.8% 0.032 254.9) |
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 #121D2B | 16.98:1 | AAA | Lc -106.2 | Preferred for body text |
| Black text on #121D2B | 1.23:1 | Fails | Lc 0.0 | Not readable |
| #121D2B text on white | 16.98:1 | AAA | Lc 103.9 | Preferred for body text |
| #121D2B 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
#F3F6F9
oklch(97.2% 0.005 247.9)
-
Step 100
100
#E5EAF1
oklch(93.5% 0.011 256.7)
-
Step 200
200
#D0DAE7
oklch(88.5% 0.021 254.9)
-
Step 300
300
#B1C2D9
oklch(80.8% 0.038 256)
-
Step 400
400
#88A3C6
oklch(70.7% 0.06 255.1)
-
Step 500
500
#6A8CB7
oklch(63.1% 0.076 254.6)
-
Step 600
600
#5175A3
oklch(55.5% 0.083 255)
-
Step 700
700
#42628C
oklch(49% 0.078 255.6)
-
Step 800
800
#365072
oklch(42.6% 0.065 255.5)
-
Step 900
900
#2F435C
oklch(37.7% 0.05 254.4)
-
Step 950
950 (this color)
#121D2B
oklch(22.8% 0.032 254.9)
#121D2B 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) | #181E2C | 0.011 |
| Deuteranopia (no green cones) | #151B2B | 0.008 |
| Tritanopia (no blue cones) | #082022 | 0.027 |
| Achromatopsia (no color) | #1C1C1C | 0.032 |
Harmonies
Hue rotations in OKLCH that keep this color's lightness and chroma.
Complementary
The opposite hue (180°).
- #121D2B
#121D2B
oklch(22.8% 0.032 254.9)
- #251A0B
#251A0B
oklch(22.7% 0.031 73.7)
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 #121D2B, closest first.
Similar named colors
The eight closest entries in our named color list, with their ΔE distance.
- Rich Black #0D1B2A ΔE 0.011
- Dark #1B2431 ΔE 0.031
- Jet #212529 ΔE 0.041
- Oxford Blue #1B263B ΔE 0.043
- Rich Navy #001219 ΔE 0.061
- Navy Blue #001146 ΔE 0.073
- Space Cadet #2B2D42 ΔE 0.079
- Almost Black #070D0D ΔE 0.080
Use #121D2B 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.