#21477D
Closest named color: Twilight Blue (#0A437A). oklch(40% 0.101 257.6), rgb(33, 71, 125).
Aa
White text reads best on this color (9.28:1).
About this color
#21477D is a dark, moderately saturated blue. In OKLCH its lightness is 40%, its chroma 0.101 and its hue 258°. Its hue sits on the cool side of the wheel. The nearest named color is Twilight Blue (#0A437A), ΔE 0.022 away. White text reads best on it, at 9.28:1.
| Hue family | Blues |
| Lightness | dark (40%) |
| Chroma | moderately saturated (0.101) |
| Temperature | cool |
| Nearest name | Twilight Blue (#0A437A) |
| Black text | 2.26:1 |
| White text | 9.28:1 |
Values
| HEX | #21477D |
| RGB | rgb(33, 71, 125) |
| HSL | hsl(215, 58%, 31%) |
| OKLCH | oklch(40% 0.101 257.6) |
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 #21477D | 9.28:1 | AAA | Lc -95.5 | Preferred for body text |
| Black text on #21477D | 2.26:1 | Fails | Lc 12.8 | Not readable |
| #21477D text on white | 9.28:1 | AAA | Lc 91.1 | Preferred for body text |
| #21477D text on black | 2.26:1 | Fails | Lc -11.2 | 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
#F1F6FC
oklch(97.1% 0.01 252.8)
-
Step 100
100
#E1EBF9
oklch(93.7% 0.022 256.7)
-
Step 200
200
#C8DBF5
oklch(88.5% 0.041 256.2)
-
Step 300
300
#A2C3F2
oklch(81% 0.076 257.2)
-
Step 400
400
#6FA2EB
oklch(70.7% 0.121 257.4)
-
Step 500
500
#4889E5
oklch(63.2% 0.154 257.4)
-
Step 600
600
#2870D3
oklch(55.5% 0.168 257.6)
-
Step 700
700
#1A5DB7
oklch(49% 0.157 257.7)
-
Step 800
800
#184D94
oklch(42.7% 0.129 257.3)
-
Step 900
900 (this color)
#21477D
oklch(40% 0.101 257.6)
-
Step 950
950
#112645
oklch(27% 0.064 258.1)
#21477D 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) | #2D4C7F | 0.021 |
| Deuteranopia (no green cones) | #1E437C | 0.013 |
| Tritanopia (no blue cones) | #00545C | 0.080 |
| Achromatopsia (no color) | #474747 | 0.101 |
Harmonies
Hue rotations in OKLCH that keep this color's lightness and chroma.
Complementary
The opposite hue (180°).
- #21477D
#21477D
oklch(40% 0.101 257.6)
- #604100
#604100
oklch(40% 0.083 78.1)
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 #21477D, closest first.
Similar named colors
The eight closest entries in our named color list, with their ΔE distance.
- Twilight Blue #0A437A ΔE 0.022
- Light Navy #155084 ΔE 0.027
- Cobalt #1E488F ΔE 0.030
- Deep Sea Blue #015482 ΔE 0.039
- Dusk Blue #26538D ΔE 0.042
- Dark Grey Blue #29465B ΔE 0.058
- Light Navy Blue #2E5A88 ΔE 0.061
- Marine Blue #01386A ΔE 0.061
Use #21477D 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.