#21406D
Closest named color: Twilight Blue (#0A437A). oklch(37.2% 0.086 257.8), rgb(33, 64, 109).
Aa
White text reads best on this color (10.40:1).
About this color
#21406D is a dark, moderately saturated blue. In OKLCH its lightness is 37%, its chroma 0.086 and its hue 258°. Its hue sits on the cool side of the wheel. The nearest named color is Twilight Blue (#0A437A), ΔE 0.026 away. White text reads best on it, at 10.40:1.
| Hue family | Blues |
| Lightness | dark (37%) |
| Chroma | moderately saturated (0.086) |
| Temperature | cool |
| Nearest name | Twilight Blue (#0A437A) |
| Black text | 2.01:1 |
| White text | 10.40:1 |
Values
| HEX | #21406D |
| RGB | rgb(33, 64, 109) |
| HSL | hsl(216, 54%, 28%) |
| OKLCH | oklch(37.2% 0.086 257.8) |
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 #21406D | 10.40:1 | AAA | Lc -98.0 | Preferred for body text |
| Black text on #21406D | 2.01:1 | Fails | Lc 10.0 | Not readable |
| #21406D text on white | 10.40:1 | AAA | Lc 93.9 | Preferred for body text |
| #21406D text on black | 2.01:1 | Fails | Lc -8.6 | 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
#F2F6FB
oklch(97.2% 0.008 253.9)
-
Step 100
100
#E2EBF7
oklch(93.7% 0.019 255.5)
-
Step 200
200
#CBDAF1
oklch(88.4% 0.036 258.9)
-
Step 300
300
#A7C3EB
oklch(81% 0.064 257.3)
-
Step 400
400
#78A2E1
oklch(70.7% 0.104 258.3)
-
Step 500
500
#548AD8
oklch(63.2% 0.132 257.6)
-
Step 600
600
#3872C6
oklch(55.6% 0.144 257.9)
-
Step 700
700
#2A5FAB
oklch(49.1% 0.134 257.9)
-
Step 800
800
#244E8A
oklch(42.7% 0.11 257.7)
-
Step 900
900 (this color)
#21406D
oklch(37.2% 0.086 257.8)
-
Step 950
950
#152741
oklch(27.2% 0.054 257.6)
#21406D 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) | #2C446F | 0.019 |
| Deuteranopia (no green cones) | #213D6C | 0.009 |
| Tritanopia (no blue cones) | #004A51 | 0.069 |
| Achromatopsia (no color) | #404040 | 0.086 |
Harmonies
Hue rotations in OKLCH that keep this color's lightness and chroma.
Complementary
The opposite hue (180°).
- #21406D
#21406D
oklch(37.2% 0.086 257.8)
- #573A00
#573A00
oklch(37.3% 0.078 77.3)
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 #21406D, closest first.
Similar named colors
The eight closest entries in our named color list, with their ΔE distance.
- Twilight Blue #0A437A ΔE 0.026
- Marine Blue #01386A ΔE 0.037
- Dark Grey Blue #29465B ΔE 0.042
- Prussian Blue #1D3557 ΔE 0.048
- Charcoal #264653 ΔE 0.054
- Light Navy #155084 ΔE 0.055
- Dark Blue Grey #1F3B4D ΔE 0.056
- Cobalt #1E488F ΔE 0.059
Use #21406D 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.