#121538
Closest named color: Rich Black (#0D1B2A). oklch(21.6% 0.067 275.6), rgb(18, 21, 56).
Aa
White text reads best on this color (17.64:1).
About this color
#121538 is a very dark, muted blue. In OKLCH its lightness is 22%, its chroma 0.067 and its hue 276°. Its hue sits on the cool side of the wheel. The nearest named color is Rich Black (#0D1B2A), ΔE 0.038 away. White text reads best on it, at 17.64:1.
| Hue family | Blues |
| Lightness | very dark (22%) |
| Chroma | muted (0.067) |
| Temperature | cool |
| Nearest name | Rich Black (#0D1B2A) |
| Black text | 1.19:1 |
| White text | 17.64:1 |
Values
| HEX | #121538 |
| RGB | rgb(18, 21, 56) |
| HSL | hsl(235, 51%, 15%) |
| OKLCH | oklch(21.6% 0.067 275.6) |
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 #121538 | 17.64:1 | AAA | Lc -106.6 | Preferred for body text |
| Black text on #121538 | 1.19:1 | Fails | Lc 0.0 | Not readable |
| #121538 text on white | 17.64:1 | AAA | Lc 104.3 | Preferred for body text |
| #121538 text on black | 1.19:1 | 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
#F3F5FD
oklch(97.1% 0.011 274.9)
-
Step 100
100
#E5E9FA
oklch(93.6% 0.023 275.4)
-
Step 200
200
#D0D7F7
oklch(88.4% 0.045 275.7)
-
Step 300
300
#B2BDF4
oklch(80.9% 0.079 275.7)
-
Step 400
400
#8B99EF
oklch(70.7% 0.127 275.7)
-
Step 500
500
#707DEA
oklch(63.1% 0.163 275.6)
-
Step 600
600
#5A63D8
oklch(55.6% 0.177 275.7)
-
Step 700
700
#4A51BB
oklch(49% 0.164 275.7)
-
Step 800
800
#3D4398
oklch(42.7% 0.137 275.9)
-
Step 900
900
#333A79
oklch(37.8% 0.106 275.3)
-
Step 950
950 (this color)
#121538
oklch(21.6% 0.067 275.6)
#121538 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) | #021A39 | 0.024 |
| Deuteranopia (no green cones) | #001737 | 0.025 |
| Tritanopia (no blue cones) | #001D24 | 0.058 |
| Achromatopsia (no color) | #191919 | 0.067 |
Harmonies
Hue rotations in OKLCH that keep this color's lightness and chroma.
Complementary
The opposite hue (180°).
- #121538
#121538
oklch(21.6% 0.067 275.6)
- #201900
#201900
oklch(21.6% 0.044 94.9)
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 #121538, closest first.
Similar named colors
The eight closest entries in our named color list, with their ΔE distance.
- Rich Black #0D1B2A ΔE 0.038
- Navy Blue #001146 ΔE 0.040
- Dark #1B2431 ΔE 0.059
- Oxford Blue #1B263B ΔE 0.060
- Night Blue #040348 ΔE 0.060
- Dark Indigo #1F0954 ΔE 0.061
- Midnight Purple #280137 ΔE 0.064
- Dark Navy #000435 ΔE 0.065
Use #121538 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.