#121F2F
Closest named color: Rich Black (#0D1B2A). oklch(23.6% 0.036 254.2), rgb(18, 31, 47).
Aa
White text reads best on this color (16.63:1).
About this color
#121F2F is a very dark, muted blue. In OKLCH its lightness is 24%, its chroma 0.036 and its hue 254°. Its hue sits on the cool side of the wheel. The nearest named color is Rich Black (#0D1B2A), ΔE 0.018 away. White text reads best on it, at 16.63:1.
| Hue family | Blues |
| Lightness | very dark (24%) |
| Chroma | muted (0.036) |
| Temperature | cool |
| Nearest name | Rich Black (#0D1B2A) |
| Black text | 1.26:1 |
| White text | 16.63:1 |
Values
| HEX | #121F2F |
| RGB | rgb(18, 31, 47) |
| HSL | hsl(213, 45%, 13%) |
| OKLCH | oklch(23.6% 0.036 254.2) |
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 #121F2F | 16.63:1 | AAA | Lc -106.0 | Preferred for body text |
| Black text on #121F2F | 1.26:1 | Fails | Lc 0.0 | Not readable |
| #121F2F text on white | 16.63:1 | AAA | Lc 103.5 | Preferred for body text |
| #121F2F text on black | 1.26:1 | 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
#E4EAF2
oklch(93.5% 0.013 255.5)
-
Step 200
200
#CFDAE9
oklch(88.5% 0.024 256.1)
-
Step 300
300
#AEC3DC
oklch(80.9% 0.042 252.9)
-
Step 400
400
#83A3CB
oklch(70.6% 0.069 254.3)
-
Step 500
500
#648CBE
oklch(63.1% 0.088 254.5)
-
Step 600
600
#4B75AA
oklch(55.5% 0.095 254.9)
-
Step 700
700
#3C6292
oklch(49% 0.089 254.9)
-
Step 800
800
#325176
oklch(42.8% 0.072 253.7)
-
Step 900
900
#2C435F
oklch(37.7% 0.056 253.9)
-
Step 950
950 (this color)
#121F2F
oklch(23.6% 0.036 254.2)
#121F2F 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) | #192030 | 0.012 |
| Deuteranopia (no green cones) | #151D2F | 0.008 |
| Tritanopia (no blue cones) | #052325 | 0.032 |
| Achromatopsia (no color) | #1E1E1E | 0.036 |
Harmonies
Hue rotations in OKLCH that keep this color's lightness and chroma.
Complementary
The opposite hue (180°).
- #121F2F
#121F2F
oklch(23.6% 0.036 254.2)
- #281C09
#281C09
oklch(23.6% 0.036 77)
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 #121F2F, closest first.
Similar named colors
The eight closest entries in our named color list, with their ΔE distance.
- Rich Black #0D1B2A ΔE 0.018
- Dark #1B2431 ΔE 0.024
- Oxford Blue #1B263B ΔE 0.034
- Jet #212529 ΔE 0.037
- Rich Navy #001219 ΔE 0.069
- Space Cadet #2B2D42 ΔE 0.071
- Navy Blue #001146 ΔE 0.071
- Gunmetal #293241 ΔE 0.080
Use #121F2F 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.