#21427E
Closest named color: Twilight Blue (#0A437A). oklch(38.9% 0.109 261.2), rgb(33, 66, 126).
Aa
White text reads best on this color (9.78:1).
About this color
#21427E is a dark, moderately saturated blue. In OKLCH its lightness is 39%, its chroma 0.109 and its hue 261°. Its hue sits on the cool side of the wheel. The nearest named color is Twilight Blue (#0A437A), ΔE 0.018 away. White text reads best on it, at 9.78:1.
| Hue family | Blues |
| Lightness | dark (39%) |
| Chroma | moderately saturated (0.109) |
| Temperature | cool |
| Nearest name | Twilight Blue (#0A437A) |
| Black text | 2.14:1 |
| White text | 9.78:1 |
Values
| HEX | #21427E |
| RGB | rgb(33, 66, 126) |
| HSL | hsl(219, 58%, 31%) |
| OKLCH | oklch(38.9% 0.109 261.2) |
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 #21427E | 9.78:1 | AAA | Lc -96.6 | Preferred for body text |
| Black text on #21427E | 2.14:1 | Fails | Lc 11.6 | Not readable |
| #21427E text on white | 9.78:1 | AAA | Lc 92.4 | Preferred for body text |
| #21427E text on black | 2.14:1 | Fails | Lc -10.0 | 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
#F1F6FD
oklch(97.1% 0.011 256.7)
-
Step 100
100
#E1EAFA
oklch(93.5% 0.024 262.1)
-
Step 200
200
#C9DAF8
oklch(88.5% 0.045 261.9)
-
Step 300
300
#A3C2F6
oklch(81% 0.081 260.6)
-
Step 400
400
#72A0F2
oklch(70.8% 0.131 261.3)
-
Step 500
500
#4C86ED
oklch(63.2% 0.167 260.9)
-
Step 600
600
#306CDB
oklch(55.5% 0.181 261.4)
-
Step 700
700
#235ABE
oklch(49.1% 0.168 261.2)
-
Step 800
800
#1E4A9A
oklch(42.7% 0.14 261.2)
-
Step 900
900 (this color)
#21427E
oklch(38.9% 0.109 261.2)
-
Step 950
950
#122548
oklch(27% 0.07 261.5)
#21427E 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) | #234880 | 0.018 |
| Deuteranopia (no green cones) | #0F407D | 0.016 |
| Tritanopia (no blue cones) | #00505A | 0.086 |
| Achromatopsia (no color) | #444444 | 0.109 |
Harmonies
Hue rotations in OKLCH that keep this color's lightness and chroma.
Complementary
The opposite hue (180°).
- #21427E
#21427E
oklch(38.9% 0.109 261.2)
- #5A3F00
#5A3F00
oklch(38.8% 0.08 81.1)
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 #21427E, closest first.
Similar named colors
The eight closest entries in our named color list, with their ΔE distance.
- Twilight Blue #0A437A ΔE 0.018
- Cobalt #1E488F ΔE 0.031
- Light Navy #155084 ΔE 0.040
- Marine Blue #01386A ΔE 0.052
- Deep Sea Blue #015482 ΔE 0.052
- Dusk Blue #26538D ΔE 0.054
- Dark Slate Blue #483D8B ΔE 0.059
- Blueberry #464196 ΔE 0.064
Use #21427E 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.