#334573
Closest named color: Twilight Blue (#0A437A). oklch(39.8% 0.081 266.6), rgb(51, 69, 115).
Aa
White text reads best on this color (9.37:1).
About this color
#334573 is a dark, moderately saturated blue. In OKLCH its lightness is 40%, its chroma 0.081 and its hue 267°. Its hue sits on the cool side of the wheel. The nearest named color is Twilight Blue (#0A437A), ΔE 0.039 away. White text reads best on it, at 9.37:1.
| Hue family | Blues |
| Lightness | dark (40%) |
| Chroma | moderately saturated (0.081) |
| Temperature | cool |
| Nearest name | Twilight Blue (#0A437A) |
| Black text | 2.23:1 |
| White text | 9.37:1 |
Values
| HEX | #334573 |
| RGB | rgb(51, 69, 115) |
| HSL | hsl(223, 39%, 33%) |
| OKLCH | oklch(39.8% 0.081 266.6) |
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 #334573 | 9.37:1 | AAA | Lc -95.9 | Preferred for body text |
| Black text on #334573 | 2.23:1 | Fails | Lc 12.4 | Not readable |
| #334573 text on white | 9.37:1 | AAA | Lc 91.5 | Preferred for body text |
| #334573 text on black | 2.23:1 | Fails | Lc -10.8 | 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
#F3F5FB
oklch(97% 0.008 271.3)
-
Step 100
100
#E4EAF6
oklch(93.6% 0.017 264.5)
-
Step 200
200
#CFD9F0
oklch(88.5% 0.033 266.9)
-
Step 300
300
#AFC0E9
oklch(80.9% 0.061 267.4)
-
Step 400
400
#859FDE
oklch(70.7% 0.097 266.7)
-
Step 500
500
#6786D5
oklch(63.2% 0.125 266.7)
-
Step 600
600
#4F6EC2
oklch(55.6% 0.135 266.8)
-
Step 700
700
#405CA8
oklch(49.2% 0.126 266.6)
-
Step 800
800
#354B88
oklch(42.7% 0.105 267)
-
Step 900
900 (this color)
#334573
oklch(39.8% 0.081 266.6)
-
Step 950
950
#1B2540
oklch(27% 0.052 267.5)
#334573 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) | #334A75 | 0.015 |
| Deuteranopia (no green cones) | #2B4472 | 0.011 |
| Tritanopia (no blue cones) | #134F56 | 0.073 |
| Achromatopsia (no color) | #464646 | 0.081 |
Harmonies
Hue rotations in OKLCH that keep this color's lightness and chroma.
Complementary
The opposite hue (180°).
- #334573
#334573
oklch(39.8% 0.081 266.6)
- #5A4300
#5A4300
oklch(39.7% 0.081 86.3)
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 #334573, closest first.
Similar named colors
The eight closest entries in our named color list, with their ΔE distance.
- Twilight Blue #0A437A ΔE 0.039
- Light Navy #155084 ΔE 0.043
- Dark Grey Blue #29465B ΔE 0.045
- Cobalt #1E488F ΔE 0.049
- Deep Sea Blue #015482 ΔE 0.052
- Dusk Blue #26538D ΔE 0.053
- Dark Slate Blue #483D8B ΔE 0.058
- Charcoal #264653 ΔE 0.060
Use #334573 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.