#21428C
Closest named color: Cobalt (#1E488F). oklch(39.9% 0.129 263.5), rgb(33, 66, 140).
Aa
White text reads best on this color (9.44:1).
About this color
#21428C is a dark, moderately saturated blue. In OKLCH its lightness is 40%, its chroma 0.129 and its hue 264°. Its hue sits on the cool side of the wheel. The nearest named color is Cobalt (#1E488F), ΔE 0.017 away. White text reads best on it, at 9.44:1.
| Hue family | Blues |
| Lightness | dark (40%) |
| Chroma | moderately saturated (0.129) |
| Temperature | cool |
| Nearest name | Cobalt (#1E488F) |
| Black text | 2.22:1 |
| White text | 9.44:1 |
Values
| HEX | #21428C |
| RGB | rgb(33, 66, 140) |
| HSL | hsl(221, 62%, 34%) |
| OKLCH | oklch(39.9% 0.129 263.5) |
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 #21428C | 9.44:1 | AAA | Lc -95.8 | Preferred for body text |
| Black text on #21428C | 2.22:1 | Fails | Lc 12.5 | Not readable |
| #21428C text on white | 9.44:1 | AAA | Lc 91.4 | Preferred for body text |
| #21428C text on black | 2.22:1 | Fails | Lc -10.9 | 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 900.
-
Step 50
50
#F1F6FF
oklch(97.2% 0.013 262.4)
-
Step 100
100
#E0EAFD
oklch(93.5% 0.028 263.4)
-
Step 200
200
#C7DAFE
oklch(88.6% 0.054 263.2)
-
Step 300
300
#A1C1FF
oklch(81% 0.095 263.3)
-
Step 400
400
#6E9DFF
oklch(70.6% 0.153 263.6)
-
Step 500
500
#4881FF
oklch(63.2% 0.197 263.5)
-
Step 600
600
#2C66EF
oklch(55.7% 0.215 263.6)
-
Step 700
700
#1F53D0
oklch(49.1% 0.201 263.5)
-
Step 800
800
#1B45A8
oklch(42.7% 0.166 263.5)
-
Step 900
900 (this color)
#21428C
oklch(39.9% 0.129 263.5)
-
Step 950
950
#10244E
oklch(27.1% 0.082 263)
#21428C 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) | #124B8F | 0.025 |
| Deuteranopia (no green cones) | #00418B | 0.021 |
| Tritanopia (no blue cones) | #005460 | 0.103 |
| Achromatopsia (no color) | #464646 | 0.129 |
Harmonies
Hue rotations in OKLCH that keep this color's lightness and chroma.
Complementary
The opposite hue (180°).
- #21428C
#21428C
oklch(39.9% 0.129 263.5)
- #5C4300
#5C4300
oklch(39.9% 0.082 84.4)
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 #21428C, closest first.
Similar named colors
The eight closest entries in our named color list, with their ΔE distance.
- Cobalt #1E488F ΔE 0.017
- Twilight Blue #0A437A ΔE 0.036
- Light Navy #155084 ΔE 0.044
- Dusk Blue #26538D ΔE 0.050
- Blueberry #464196 ΔE 0.051
- Dark Slate Blue #483D8B ΔE 0.052
- Sapphire #2138AB ΔE 0.057
- Deep Sea Blue #015482 ΔE 0.057
Use #21428C 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.