#121F37
Closest named color: Dark (#1B2431). oklch(24.1% 0.05 261.8), rgb(18, 31, 55).
Aa
White text reads best on this color (16.44:1).
About this color
#121F37 is a very dark, muted blue. In OKLCH its lightness is 24%, its chroma 0.050 and its hue 262°. Its hue sits on the cool side of the wheel. The nearest named color is Dark (#1B2431), ΔE 0.028 away. White text reads best on it, at 16.44:1.
| Hue family | Blues |
| Lightness | very dark (24%) |
| Chroma | muted (0.050) |
| Temperature | cool |
| Nearest name | Dark (#1B2431) |
| Black text | 1.27:1 |
| White text | 16.44:1 |
Values
| HEX | #121F37 |
| RGB | rgb(18, 31, 55) |
| HSL | hsl(219, 51%, 14%) |
| OKLCH | oklch(24.1% 0.05 261.8) |
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 #121F37 | 16.44:1 | AAA | Lc -105.8 | Preferred for body text |
| Black text on #121F37 | 1.27:1 | Fails | Lc 0.0 | Not readable |
| #121F37 text on white | 16.44:1 | AAA | Lc 103.3 | Preferred for body text |
| #121F37 text on black | 1.27:1 | 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
#F2F6FB
oklch(97.2% 0.008 253.9)
-
Step 100
100
#E4EAF6
oklch(93.6% 0.017 264.5)
-
Step 200
200
#CDDAEF
oklch(88.5% 0.032 260)
-
Step 300
300
#ACC1E7
oklch(80.8% 0.059 262.3)
-
Step 400
400
#80A1DC
oklch(70.7% 0.094 261.7)
-
Step 500
500
#6088D2
oklch(63% 0.121 261.9)
-
Step 600
600
#4771BF
oklch(55.6% 0.13 261.7)
-
Step 700
700
#385EA5
oklch(49% 0.122 261.7)
-
Step 800
800
#2F4D86
oklch(42.7% 0.101 262)
-
Step 900
900
#2A416B
oklch(37.8% 0.078 261.6)
-
Step 950
950 (this color)
#121F37
oklch(24.1% 0.05 261.8)
#121F37 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) | #152138 | 0.009 |
| Deuteranopia (no green cones) | #101E36 | 0.005 |
| Tritanopia (no blue cones) | #002428 | 0.043 |
| Achromatopsia (no color) | #1F1F1F | 0.050 |
Harmonies
Hue rotations in OKLCH that keep this color's lightness and chroma.
Complementary
The opposite hue (180°).
- #121F37
#121F37
oklch(24.1% 0.05 261.8)
- #2B1D00
#2B1D00
oklch(24.2% 0.05 83)
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 #121F37, closest first.
Similar named colors
The eight closest entries in our named color list, with their ΔE distance.
- Dark #1B2431 ΔE 0.028
- Rich Black #0D1B2A ΔE 0.028
- Oxford Blue #1B263B ΔE 0.029
- Jet #212529 ΔE 0.046
- Navy Blue #001146 ΔE 0.061
- Space Cadet #2B2D42 ΔE 0.066
- Gunmetal #293241 ΔE 0.077
- Rich Navy #001219 ΔE 0.079
Use #121F37 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.