#333873
Closest named color: Twilight Blue (#0A437A). oklch(36.9% 0.1 276.7), rgb(51, 56, 115).
Aa
White text reads best on this color (10.74:1).
About this color
#333873 is a dark, moderately saturated blue. In OKLCH its lightness is 37%, its chroma 0.100 and its hue 277°. Its hue sits on the cool side of the wheel. The nearest named color is Twilight Blue (#0A437A), ΔE 0.046 away. White text reads best on it, at 10.74:1.
| Hue family | Blues |
| Lightness | dark (37%) |
| Chroma | moderately saturated (0.100) |
| Temperature | cool |
| Nearest name | Twilight Blue (#0A437A) |
| Black text | 1.95:1 |
| White text | 10.74:1 |
Values
| HEX | #333873 |
| RGB | rgb(51, 56, 115) |
| HSL | hsl(235, 39%, 33%) |
| OKLCH | oklch(36.9% 0.1 276.7) |
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 #333873 | 10.74:1 | AAA | Lc -98.7 | Preferred for body text |
| Black text on #333873 | 1.95:1 | Fails | Lc 9.2 | Not readable |
| #333873 text on white | 10.74:1 | AAA | Lc 94.7 | Preferred for body text |
| #333873 text on black | 1.95:1 | Fails | Lc -7.9 | 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
#F3F5FC
oklch(97.1% 0.01 273.4)
-
Step 100
100
#E6E9F9
oklch(93.6% 0.022 277.5)
-
Step 200
200
#D1D7F5
oklch(88.4% 0.042 276.6)
-
Step 300
300
#B4BDF1
oklch(80.9% 0.074 277)
-
Step 400
400
#8D99EB
oklch(70.7% 0.121 276.5)
-
Step 500
500
#737EE4
oklch(63.2% 0.152 276.5)
-
Step 600
600
#5D64D2
oklch(55.5% 0.167 276.8)
-
Step 700
700
#4D53B6
oklch(49.2% 0.154 276.5)
-
Step 800
800
#3F4493
oklch(42.7% 0.128 276.8)
-
Step 900
900 (this color)
#333873
oklch(36.9% 0.1 276.7)
-
Step 950
950
#1F2345
oklch(27.1% 0.063 276.3)
#333873 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) | #1C4075 | 0.033 |
| Deuteranopia (no green cones) | #143B72 | 0.036 |
| Tritanopia (no blue cones) | #164550 | 0.087 |
| Achromatopsia (no color) | #3E3E3E | 0.100 |
Harmonies
Hue rotations in OKLCH that keep this color's lightness and chroma.
Complementary
The opposite hue (180°).
- #333873
#333873
oklch(36.9% 0.1 276.7)
- #4B3F00
#4B3F00
oklch(36.9% 0.076 96.9)
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 #333873, closest first.
Similar named colors
The eight closest entries in our named color list, with their ΔE distance.
- Twilight Blue #0A437A ΔE 0.046
- Marine Blue #01386A ΔE 0.052
- Dark Slate Blue #483D8B ΔE 0.055
- Prussian Blue #1D3557 ΔE 0.059
- Cobalt #1E488F ΔE 0.062
- Dark Grey Blue #29465B ΔE 0.067
- Blueberry #464196 ΔE 0.070
- Marine #042E60 ΔE 0.072
Use #333873 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.