#021728
Closest named color: Rich Black (#0D1B2A). oklch(19.7% 0.045 244.5), rgb(2, 23, 40).
Aa
White text reads best on this color (18.16:1).
About this color
#021728 is a very dark, muted blue. In OKLCH its lightness is 20%, its chroma 0.045 and its hue 245°. Its hue sits on the cool side of the wheel. The nearest named color is Rich Black (#0D1B2A), ΔE 0.023 away. White text reads best on it, at 18.16:1.
| Hue family | Blues |
| Lightness | very dark (20%) |
| Chroma | muted (0.045) |
| Temperature | cool |
| Nearest name | Rich Black (#0D1B2A) |
| Black text | 1.15:1 |
| White text | 18.16:1 |
Values
| HEX | #021728 |
| RGB | rgb(2, 23, 40) |
| HSL | hsl(207, 90%, 8%) |
| OKLCH | oklch(19.7% 0.045 244.5) |
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 #021728 | 18.16:1 | AAA | Lc -106.9 | Preferred for body text |
| Black text on #021728 | 1.15:1 | Fails | Lc 0.0 | Not readable |
| #021728 text on white | 18.16:1 | AAA | Lc 104.7 | Preferred for body text |
| #021728 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
#F2F6FA
oklch(97.1% 0.007 247.9)
-
Step 100
100
#E2EBF4
oklch(93.6% 0.016 248)
-
Step 200
200
#CADCEC
oklch(88.6% 0.029 244.9)
-
Step 300
300
#A5C5E1
oklch(80.9% 0.053 244.9)
-
Step 400
400
#72A7D2
oklch(70.8% 0.085 243.9)
-
Step 500
500
#4B90C6
oklch(63.2% 0.108 244.3)
-
Step 600
600
#2979B3
oklch(55.6% 0.118 244.5)
-
Step 700
700
#1B669A
oklch(49.2% 0.109 244.3)
-
Step 800
800
#1A537D
oklch(42.7% 0.091 244.9)
-
Step 900
900
#1C4564
oklch(37.7% 0.07 244.2)
-
Step 950
950 (this color)
#021728
oklch(19.7% 0.045 244.5)
#021728 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) | #0F1829 | 0.019 |
| Deuteranopia (no green cones) | #091428 | 0.014 |
| Tritanopia (no blue cones) | #001B1D | 0.031 |
| Achromatopsia (no color) | #161616 | 0.045 |
Harmonies
Hue rotations in OKLCH that keep this color's lightness and chroma.
Complementary
The opposite hue (180°).
- #021728
#021728
oklch(19.7% 0.045 244.5)
- #231000
#231000
oklch(19.7% 0.045 63.4)
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 #021728, closest first.
Similar named colors
The eight closest entries in our named color list, with their ΔE distance.
- Rich Black #0D1B2A ΔE 0.023
- Rich Navy #001219 ΔE 0.034
- Almost Black #070D0D ΔE 0.059
- Navy Blue #001146 ΔE 0.063
- Dark #1B2431 ΔE 0.063
- Dark Navy #000435 ΔE 0.067
- Oxford Blue #1B263B ΔE 0.073
- Jet #212529 ΔE 0.074
Use #021728 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.