#121729
Closest named color: Rich Black (#0D1B2A). oklch(20.9% 0.037 271.2), rgb(18, 23, 41).
Aa
White text reads best on this color (17.79:1).
About this color
#121729 is a very dark, muted blue. In OKLCH its lightness is 21%, its chroma 0.037 and its hue 271°. Its hue sits on the cool side of the wheel. The nearest named color is Rich Black (#0D1B2A), ΔE 0.015 away. White text reads best on it, at 17.79:1.
| Hue family | Blues |
| Lightness | very dark (21%) |
| Chroma | muted (0.037) |
| Temperature | cool |
| Nearest name | Rich Black (#0D1B2A) |
| Black text | 1.18:1 |
| White text | 17.79:1 |
Values
| HEX | #121729 |
| RGB | rgb(18, 23, 41) |
| HSL | hsl(227, 39%, 12%) |
| OKLCH | oklch(20.9% 0.037 271.2) |
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 #121729 | 17.79:1 | AAA | Lc -106.8 | Preferred for body text |
| Black text on #121729 | 1.18:1 | Fails | Lc 0.0 | Not readable |
| #121729 text on white | 17.79:1 | AAA | Lc 104.5 | Preferred for body text |
| #121729 text on black | 1.18:1 | 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
#F4F5F9
oklch(97.1% 0.005 275)
-
Step 100
100
#E7EAF3
oklch(93.7% 0.013 271.3)
-
Step 200
200
#D3D9EA
oklch(88.6% 0.024 270.3)
-
Step 300
300
#B6C0DD
oklch(80.9% 0.042 270.4)
-
Step 400
400
#909FCD
oklch(70.7% 0.07 270.5)
-
Step 500
500
#7686C0
oklch(63.1% 0.09 271.8)
-
Step 600
600
#5F6FAC
oklch(55.5% 0.097 271.8)
-
Step 700
700
#4E5D94
oklch(49.1% 0.09 271.2)
-
Step 800
800
#404C78
oklch(42.7% 0.075 271.4)
-
Step 900
900
#364060
oklch(37.7% 0.057 270.3)
-
Step 950
950 (this color)
#121729
oklch(20.9% 0.037 271.2)
#121729 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) | #11192A | 0.007 |
| Deuteranopia (no green cones) | #0E1729 | 0.006 |
| Tritanopia (no blue cones) | #0A1B1E | 0.033 |
| Achromatopsia (no color) | #181818 | 0.037 |
Harmonies
Hue rotations in OKLCH that keep this color's lightness and chroma.
Complementary
The opposite hue (180°).
- #121729
#121729
oklch(20.9% 0.037 271.2)
- #1E1703
#1E1703
oklch(20.8% 0.037 91.2)
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 #121729, closest first.
Similar named colors
The eight closest entries in our named color list, with their ΔE distance.
- Rich Black #0D1B2A ΔE 0.015
- Rich Navy #001219 ΔE 0.049
- Dark #1B2431 ΔE 0.050
- Jet #212529 ΔE 0.060
- Oxford Blue #1B263B ΔE 0.060
- Navy Blue #001146 ΔE 0.066
- Almost Black #070D0D ΔE 0.067
- Dark Navy #000435 ΔE 0.077
Use #121729 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.