#34378B
Closest named color: Dark Slate Blue (#483D8B). oklch(38.7% 0.137 276.4), rgb(52, 55, 139).
Aa
White text reads best on this color (10.16:1).
About this color
#34378B is a dark, moderately saturated blue. In OKLCH its lightness is 39%, its chroma 0.137 and its hue 276°. Its hue sits on the cool side of the wheel. The nearest named color is Dark Slate Blue (#483D8B), ΔE 0.037 away. White text reads best on it, at 10.16:1.
| Hue family | Blues |
| Lightness | dark (39%) |
| Chroma | moderately saturated (0.137) |
| Temperature | cool |
| Nearest name | Dark Slate Blue (#483D8B) |
| Black text | 2.06:1 |
| White text | 10.16:1 |
Values
| HEX | #34378B |
| RGB | rgb(52, 55, 139) |
| HSL | hsl(238, 46%, 37%) |
| OKLCH | oklch(38.7% 0.137 276.4) |
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 #34378B | 10.16:1 | AAA | Lc -97.3 | Preferred for body text |
| Black text on #34378B | 2.06:1 | Fails | Lc 10.7 | Not readable |
| #34378B text on white | 10.16:1 | AAA | Lc 93.2 | Preferred for body text |
| #34378B text on black | 2.06:1 | Fails | Lc -9.3 | 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
#F3F5FF
oklch(97.2% 0.013 277.1)
-
Step 100
100
#E4E9FE
oklch(93.7% 0.029 275.2)
-
Step 200
200
#CFD7FF
oklch(88.6% 0.056 276.3)
-
Step 300
300
#B0BCFF
oklch(81% 0.096 276.2)
-
Step 400
400
#8895FF
oklch(70.6% 0.155 276.4)
-
Step 500
500
#6E76FF
oklch(63.1% 0.2 276.5)
-
Step 600
600
#5857F4
oklch(55.6% 0.228 276.3)
-
Step 700
700
#4945D5
oklch(49% 0.213 276.3)
-
Step 800
800
#3C3AAC
oklch(42.7% 0.176 276.7)
-
Step 900
900 (this color)
#34378B
oklch(38.7% 0.137 276.4)
-
Step 950
950
#1D2050
oklch(27.2% 0.087 276.3)
#34378B 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) | #00458E | 0.050 |
| Deuteranopia (no green cones) | #003E89 | 0.045 |
| Tritanopia (no blue cones) | #004B5B | 0.116 |
| Achromatopsia (no color) | #414141 | 0.137 |
Harmonies
Hue rotations in OKLCH that keep this color's lightness and chroma.
Complementary
The opposite hue (180°).
- #34378B
#34378B
oklch(38.7% 0.137 276.4)
- #514300
#514300
oklch(38.6% 0.079 95.5)
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 #34378B, closest first.
Similar named colors
The eight closest entries in our named color list, with their ΔE distance.
- Dark Slate Blue #483D8B ΔE 0.037
- Blueberry #464196 ΔE 0.044
- Cobalt #1E488F ΔE 0.047
- Sapphire #2138AB ΔE 0.057
- Twilight Blue #0A437A ΔE 0.058
- Light Navy #155084 ΔE 0.073
- Dusk Blue #26538D ΔE 0.075
- Marine Blue #01386A ΔE 0.077
Use #34378B 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.