#121837
Closest named color: Rich Black (#0D1B2A). oklch(22.3% 0.061 272.4), rgb(18, 24, 55).
Aa
White text reads best on this color (17.33:1).
About this color
#121837 is a very dark, muted blue. In OKLCH its lightness is 22%, its chroma 0.061 and its hue 272°. 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 17.33:1.
| Hue family | Blues |
| Lightness | very dark (22%) |
| Chroma | muted (0.061) |
| Temperature | cool |
| Nearest name | Rich Black (#0D1B2A) |
| Black text | 1.21:1 |
| White text | 17.33:1 |
Values
| HEX | #121837 |
| RGB | rgb(18, 24, 55) |
| HSL | hsl(230, 51%, 14%) |
| OKLCH | oklch(22.3% 0.061 272.4) |
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 #121837 | 17.33:1 | AAA | Lc -106.4 | Preferred for body text |
| Black text on #121837 | 1.21:1 | Fails | Lc 0.0 | Not readable |
| #121837 text on white | 17.33:1 | AAA | Lc 104.1 | Preferred for body text |
| #121837 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
#F3F5FC
oklch(97.1% 0.01 273.4)
-
Step 100
100
#E5E9F8
oklch(93.5% 0.021 274)
-
Step 200
200
#D0D8F4
oklch(88.5% 0.04 272.9)
-
Step 300
300
#B0BEF0
oklch(80.8% 0.073 272.5)
-
Step 400
400
#889BE8
oklch(70.6% 0.115 272.6)
-
Step 500
500
#6C81E1
oklch(63.1% 0.146 272.3)
-
Step 600
600
#5568CF
oklch(55.6% 0.159 272.3)
-
Step 700
700
#4656B3
oklch(49.1% 0.148 272.5)
-
Step 800
800
#394791
oklch(42.7% 0.122 272.2)
-
Step 900
900
#313C74
oklch(37.7% 0.096 272.6)
-
Step 950
950 (this color)
#121837
oklch(22.3% 0.061 272.4)
#121837 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) | #091C38 | 0.016 |
| Deuteranopia (no green cones) | #051936 | 0.017 |
| Tritanopia (no blue cones) | #001F24 | 0.055 |
| Achromatopsia (no color) | #1A1A1A | 0.061 |
Harmonies
Hue rotations in OKLCH that keep this color's lightness and chroma.
Complementary
The opposite hue (180°).
- #121837
#121837
oklch(22.3% 0.061 272.4)
- #231A00
#231A00
oklch(22.2% 0.045 91.1)
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 #121837, closest first.
Similar named colors
The eight closest entries in our named color list, with their ΔE distance.
- Rich Black #0D1B2A ΔE 0.031
- Navy Blue #001146 ΔE 0.046
- Dark #1B2431 ΔE 0.049
- Oxford Blue #1B263B ΔE 0.051
- Jet #212529 ΔE 0.065
- Dark Indigo #1F0954 ΔE 0.066
- Night Blue #040348 ΔE 0.068
- Midnight Purple #280137 ΔE 0.070
Use #121837 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.