#21395D
Closest named color: Prussian Blue (#1D3557). oklch(34.4% 0.07 258.3), rgb(33, 57, 93).
Aa
White text reads best on this color (11.61:1).
About this color
#21395D is a dark, moderately saturated blue. In OKLCH its lightness is 34%, its chroma 0.070 and its hue 258°. Its hue sits on the cool side of the wheel. The nearest named color is Prussian Blue (#1D3557), ΔE 0.017 away. White text reads best on it, at 11.61:1.
| Hue family | Blues |
| Lightness | dark (34%) |
| Chroma | moderately saturated (0.070) |
| Temperature | cool |
| Nearest name | Prussian Blue (#1D3557) |
| Black text | 1.80:1 |
| White text | 11.61:1 |
Values
| HEX | #21395D |
| RGB | rgb(33, 57, 93) |
| HSL | hsl(216, 48%, 25%) |
| OKLCH | oklch(34.4% 0.07 258.3) |
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 #21395D | 11.61:1 | AAA | Lc -100.2 | Preferred for body text |
| Black text on #21395D | 1.80:1 | Fails | Lc 7.3 | Not readable |
| #21395D text on white | 11.61:1 | AAA | Lc 96.6 | Preferred for body text |
| #21395D text on black | 1.80:1 | Fails | Lc 0.0 | 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
#F3F6FA
oklch(97.2% 0.006 255.5)
-
Step 100
100
#E4EAF4
oklch(93.5% 0.015 260.7)
-
Step 200
200
#CEDAED
oklch(88.5% 0.029 259.6)
-
Step 300
300
#ACC2E3
oklch(80.8% 0.053 258.4)
-
Step 400
400
#80A2D5
oklch(70.6% 0.084 258.3)
-
Step 500
500
#608ACA
oklch(63% 0.108 258.6)
-
Step 600
600
#4673B7
oklch(55.5% 0.117 258.4)
-
Step 700
700
#38609E
oklch(49.1% 0.11 258.9)
-
Step 800
800
#2E4F80
oklch(42.7% 0.091 258.1)
-
Step 900
900 (this color)
#21395D
oklch(34.4% 0.07 258.3)
-
Step 950
950
#19273C
oklch(27.1% 0.044 258.3)
#21395D 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) | #2A3C5E | 0.016 |
| Deuteranopia (no green cones) | #22365C | 0.009 |
| Tritanopia (no blue cones) | #004146 | 0.060 |
| Achromatopsia (no color) | #393939 | 0.070 |
Harmonies
Hue rotations in OKLCH that keep this color's lightness and chroma.
Complementary
The opposite hue (180°).
- #21395D
#21395D
oklch(34.4% 0.07 258.3)
- #4D3402
#4D3402
oklch(34.6% 0.07 78.3)
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 #21395D, closest first.
Similar named colors
The eight closest entries in our named color list, with their ΔE distance.
- Prussian Blue #1D3557 ΔE 0.017
- Dark Blue Grey #1F3B4D ΔE 0.031
- Marine Blue #01386A ΔE 0.033
- Midnight Green #073B4C ΔE 0.041
- Dark Grey Blue #29465B ΔE 0.046
- Marine #042E60 ΔE 0.047
- Gunmetal #293241 ΔE 0.050
- Charcoal #264653 ΔE 0.051
Use #21395D 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.