#021531
Closest named color: Rich Black (#0D1B2A). oklch(19.9% 0.062 256.5), rgb(2, 21, 49).
Aa
White text reads best on this color (18.19:1).
About this color
#021531 is a very dark, muted blue. In OKLCH its lightness is 20%, its chroma 0.062 and its hue 257°. Its hue sits on the cool side of the wheel. The nearest named color is Rich Black (#0D1B2A), ΔE 0.033 away. White text reads best on it, at 18.19:1.
| Hue family | Blues |
| Lightness | very dark (20%) |
| Chroma | muted (0.062) |
| Temperature | cool |
| Nearest name | Rich Black (#0D1B2A) |
| Black text | 1.15:1 |
| White text | 18.19:1 |
Values
| HEX | #021531 |
| RGB | rgb(2, 21, 49) |
| HSL | hsl(216, 92%, 10%) |
| OKLCH | oklch(19.9% 0.062 256.5) |
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 #021531 | 18.19:1 | AAA | Lc -106.9 | Preferred for body text |
| Black text on #021531 | 1.15:1 | Fails | Lc 0.0 | Not readable |
| #021531 text on white | 18.19:1 | AAA | Lc 104.7 | Preferred for body text |
| #021531 text on black | 1.15:1 | 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
#F1F6FC
oklch(97.1% 0.01 252.8)
-
Step 100
100
#E1EBF8
oklch(93.6% 0.021 254.9)
-
Step 200
200
#C8DBF5
oklch(88.5% 0.041 256.2)
-
Step 300
300
#A2C3F0
oklch(80.9% 0.073 256.2)
-
Step 400
400
#6FA3E9
oklch(70.8% 0.117 256.1)
-
Step 500
500
#478AE2
oklch(63.2% 0.15 256.1)
-
Step 600
600
#2771D0
oklch(55.5% 0.163 256.6)
-
Step 700
700
#195EB4
oklch(49% 0.152 256.6)
-
Step 800
800
#184E92
oklch(42.8% 0.125 256.3)
-
Step 900
900
#1B4174
oklch(37.7% 0.098 256.7)
-
Step 950
950 (this color)
#021531
oklch(19.9% 0.062 256.5)
#021531 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) | #061832 | 0.013 |
| Deuteranopia (no green cones) | #001330 | 0.008 |
| Tritanopia (no blue cones) | #001C20 | 0.048 |
| Achromatopsia (no color) | #151515 | 0.062 |
Harmonies
Hue rotations in OKLCH that keep this color's lightness and chroma.
Complementary
The opposite hue (180°).
- #021531
#021531
oklch(19.9% 0.062 256.5)
- #201300
#201300
oklch(19.9% 0.042 78)
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 #021531, closest first.
Similar named colors
The eight closest entries in our named color list, with their ΔE distance.
- Rich Black #0D1B2A ΔE 0.033
- Navy Blue #001146 ΔE 0.043
- Rich Navy #001219 ΔE 0.050
- Dark Navy #000435 ΔE 0.053
- Night Blue #040348 ΔE 0.061
- Dark Navy Blue #00022E ΔE 0.063
- Very Dark Blue #000133 ΔE 0.063
- Midnight #03012D ΔE 0.065
Use #021531 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.