#334D99
Closest named color: Dusk Blue (#26538D). oklch(44.2% 0.128 266.9), rgb(51, 77, 153).
Aa
White text reads best on this color (7.88:1).
About this color
#334D99 is a dark, moderately saturated blue. In OKLCH its lightness is 44%, its chroma 0.128 and its hue 267°. Its hue sits on the cool side of the wheel. The nearest named color is Dusk Blue (#26538D), ΔE 0.030 away. White text reads best on it, at 7.88:1.
| Hue family | Blues |
| Lightness | dark (44%) |
| Chroma | moderately saturated (0.128) |
| Temperature | cool |
| Nearest name | Dusk Blue (#26538D) |
| Black text | 2.66:1 |
| White text | 7.88:1 |
Values
| HEX | #334D99 |
| RGB | rgb(51, 77, 153) |
| HSL | hsl(225, 50%, 40%) |
| OKLCH | oklch(44.2% 0.128 266.9) |
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 #334D99 | 7.88:1 | AAA | Lc -91.8 | Preferred for body text |
| Black text on #334D99 | 2.66:1 | Fails | Lc 16.9 | Dividers and decoration only |
| #334D99 text on white | 7.88:1 | AAA | Lc 87.1 | Fine for body text |
| #334D99 text on black | 2.66:1 | Fails | Lc -15.0 | Dividers and decoration only |
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 800.
-
Step 50
50
#F2F5FC
oklch(97% 0.01 267.4)
-
Step 100
100
#E3EAF9
oklch(93.6% 0.022 265.8)
-
Step 200
200
#CDD9F6
oklch(88.5% 0.042 267.7)
-
Step 300
300
#ABC0F2
oklch(80.9% 0.075 267)
-
Step 400
400
#7F9EEB
oklch(70.8% 0.119 266.7)
-
Step 500
500
#5F83E5
oklch(63% 0.153 266.8)
-
Step 600
600
#476BD3
oklch(55.7% 0.165 266.7)
-
Step 700
700
#3958B7
oklch(49.1% 0.155 267)
-
Step 800
800 (this color)
#334D99
oklch(44.2% 0.128 266.9)
-
Step 900
900
#293E76
oklch(37.8% 0.099 266.3)
-
Step 950
950
#182445
oklch(26.9% 0.064 267)
#334D99 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) | #24569C | 0.026 |
| Deuteranopia (no green cones) | #0B4D97 | 0.031 |
| Tritanopia (no blue cones) | #005F6B | 0.108 |
| Achromatopsia (no color) | #515151 | 0.128 |
Harmonies
Hue rotations in OKLCH that keep this color's lightness and chroma.
Complementary
The opposite hue (180°).
- #334D99
#334D99
oklch(44.2% 0.128 266.9)
- #694F00
#694F00
oklch(44.3% 0.091 86.7)
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 #334D99, closest first.
Similar named colors
The eight closest entries in our named color list, with their ΔE distance.
- Dusk Blue #26538D ΔE 0.030
- Cobalt #1E488F ΔE 0.032
- Blueberry #464196 ΔE 0.037
- Denim Blue #3B5B92 ΔE 0.045
- Twilight #4E518B ΔE 0.046
- Light Navy #155084 ΔE 0.046
- Dark Slate Blue #483D8B ΔE 0.050
- Light Navy Blue #2E5A88 ΔE 0.051
Use #334D99 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.