#21428D
Closest named color: Cobalt (#1E488F). oklch(40% 0.131 263.7), rgb(33, 66, 141).
Aa
White text reads best on this color (9.42:1).
About this color
#21428D is a dark, moderately saturated blue. In OKLCH its lightness is 40%, its chroma 0.131 and its hue 264°. Its hue sits on the cool side of the wheel. The nearest named color is Cobalt (#1E488F), ΔE 0.016 away. White text reads best on it, at 9.42:1.
| Hue family | Blues |
| Lightness | dark (40%) |
| Chroma | moderately saturated (0.131) |
| Temperature | cool |
| Nearest name | Cobalt (#1E488F) |
| Black text | 2.22:1 |
| White text | 9.42:1 |
Values
| HEX | #21428D |
| RGB | rgb(33, 66, 141) |
| HSL | hsl(222, 62%, 34%) |
| OKLCH | oklch(40% 0.131 263.7) |
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 #21428D | 9.42:1 | AAA | Lc -95.7 | Preferred for body text |
| Black text on #21428D | 2.22:1 | Fails | Lc 12.6 | Not readable |
| #21428D text on white | 9.42:1 | AAA | Lc 91.4 | Preferred for body text |
| #21428D text on black | 2.22:1 | Fails | Lc -11.0 | 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 900.
-
Step 50
50
#F1F6FF
oklch(97.2% 0.013 262.4)
-
Step 100
100
#E0EAFE
oklch(93.6% 0.029 264.4)
-
Step 200
200
#C7DAFE
oklch(88.6% 0.054 263.2)
-
Step 300
300
#A1C0FF
oklch(80.8% 0.096 264.1)
-
Step 400
400
#6E9DFF
oklch(70.6% 0.153 263.6)
-
Step 500
500
#4880FF
oklch(63% 0.198 263.8)
-
Step 600
600
#2B65F0
oklch(55.6% 0.218 263.6)
-
Step 700
700
#1F53D1
oklch(49.2% 0.202 263.6)
-
Step 800
800
#1B45A9
oklch(42.8% 0.167 263.6)
-
Step 900
900 (this color)
#21428D
oklch(40% 0.131 263.7)
-
Step 950
950
#10234E
oklch(26.8% 0.083 263.8)
#21428D 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) | #104B90 | 0.025 |
| Deuteranopia (no green cones) | #00418C | 0.021 |
| Tritanopia (no blue cones) | #005461 | 0.103 |
| Achromatopsia (no color) | #464646 | 0.131 |
Harmonies
Hue rotations in OKLCH that keep this color's lightness and chroma.
Complementary
The opposite hue (180°).
- #21428D
#21428D
oklch(40% 0.131 263.7)
- #5D4300
#5D4300
oklch(40.1% 0.082 83.4)
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 #21428D, closest first.
Similar named colors
The eight closest entries in our named color list, with their ΔE distance.
- Cobalt #1E488F ΔE 0.016
- Twilight Blue #0A437A ΔE 0.037
- Light Navy #155084 ΔE 0.045
- Dusk Blue #26538D ΔE 0.050
- Blueberry #464196 ΔE 0.051
- Dark Slate Blue #483D8B ΔE 0.052
- Sapphire #2138AB ΔE 0.055
- Deep Sea Blue #015482 ΔE 0.058
Use #21428D 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.