#34377B
Closest named color: Dark Slate Blue (#483D8B). oklch(37.4% 0.113 277.5), rgb(52, 55, 123).
Aa
White text reads best on this color (10.61:1).
About this color
#34377B is a dark, moderately saturated blue. In OKLCH its lightness is 37%, its chroma 0.113 and its hue 277°. Its hue sits on the cool side of the wheel. The nearest named color is Dark Slate Blue (#483D8B), ΔE 0.046 away. White text reads best on it, at 10.61:1.
| Hue family | Blues |
| Lightness | dark (37%) |
| Chroma | moderately saturated (0.113) |
| Temperature | cool |
| Nearest name | Dark Slate Blue (#483D8B) |
| Black text | 1.97:1 |
| White text | 10.61:1 |
Values
| HEX | #34377B |
| RGB | rgb(52, 55, 123) |
| HSL | hsl(237, 41%, 34%) |
| OKLCH | oklch(37.4% 0.113 277.5) |
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 #34377B | 10.61:1 | AAA | Lc -98.3 | Preferred for body text |
| Black text on #34377B | 1.97:1 | Fails | Lc 9.5 | Not readable |
| #34377B text on white | 10.61:1 | AAA | Lc 94.4 | Preferred for body text |
| #34377B text on black | 1.97:1 | Fails | Lc -8.2 | 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
#F3F5FD
oklch(97.1% 0.011 274.9)
-
Step 100
100
#E5E9FB
oklch(93.6% 0.025 275.9)
-
Step 200
200
#D1D7F9
oklch(88.5% 0.047 277.5)
-
Step 300
300
#B3BCF8
oklch(80.9% 0.085 277.7)
-
Step 400
400
#8D97F4
oklch(70.7% 0.136 277.7)
-
Step 500
500
#737AF0
oklch(63.2% 0.174 277.6)
-
Step 600
600
#5D60DE
oklch(55.7% 0.188 277.4)
-
Step 700
700
#4D4EC1
oklch(49.1% 0.176 277.4)
-
Step 800
800
#3F419C
oklch(42.8% 0.145 277.4)
-
Step 900
900 (this color)
#34377B
oklch(37.4% 0.113 277.5)
-
Step 950
950
#1F2149
oklch(27% 0.073 278.2)
#34377B 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) | #0F417D | 0.043 |
| Deuteranopia (no green cones) | #013C7A | 0.047 |
| Tritanopia (no blue cones) | #0F4653 | 0.098 |
| Achromatopsia (no color) | #3E3E3E | 0.114 |
Harmonies
Hue rotations in OKLCH that keep this color's lightness and chroma.
Complementary
The opposite hue (180°).
- #34377B
#34377B
oklch(37.4% 0.113 277.5)
- #4C4000
#4C4000
oklch(37.3% 0.077 97.1)
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 #34377B, closest first.
Similar named colors
The eight closest entries in our named color list, with their ΔE distance.
- Dark Slate Blue #483D8B ΔE 0.046
- Twilight Blue #0A437A ΔE 0.048
- Cobalt #1E488F ΔE 0.056
- Marine Blue #01386A ΔE 0.059
- Blueberry #464196 ΔE 0.060
- Prussian Blue #1D3557 ΔE 0.072
- Light Navy #155084 ΔE 0.072
- Marine #042E60 ΔE 0.079
Use #34377B 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.