#34378A
Closest named color: Dark Slate Blue (#483D8B). oklch(38.6% 0.135 276.4), rgb(52, 55, 138).
Aa
White text reads best on this color (10.19:1).
About this color
#34378A is a dark, moderately saturated blue. In OKLCH its lightness is 39%, its chroma 0.135 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 10.19:1.
| Hue family | Blues |
| Lightness | dark (39%) |
| Chroma | moderately saturated (0.135) |
| Temperature | cool |
| Nearest name | Dark Slate Blue (#483D8B) |
| Black text | 2.05:1 |
| White text | 10.19:1 |
Values
| HEX | #34378A |
| RGB | rgb(52, 55, 138) |
| HSL | hsl(238, 45%, 37%) |
| OKLCH | oklch(38.6% 0.135 276.4) |
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 #34378A | 10.19:1 | AAA | Lc -97.4 | Preferred for body text |
| Black text on #34378A | 2.05:1 | Fails | Lc 10.6 | Not readable |
| #34378A text on white | 10.19:1 | AAA | Lc 93.3 | Preferred for body text |
| #34378A text on black | 2.05:1 | Fails | Lc -9.2 | 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
#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
#B0BBFF
oklch(80.8% 0.097 276.9)
-
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
#5958F3
oklch(55.7% 0.225 276.5)
-
Step 700
700
#4946D4
oklch(49.1% 0.211 276.3)
-
Step 800
800
#3C3BAB
oklch(42.7% 0.174 276.5)
-
Step 900
900 (this color)
#34378A
oklch(38.6% 0.135 276.4)
-
Step 950
950
#1D204F
oklch(27.1% 0.085 276.4)
#34378A 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) | #00458D | 0.050 |
| Deuteranopia (no green cones) | #003D88 | 0.045 |
| Tritanopia (no blue cones) | #004B5B | 0.115 |
| Achromatopsia (no color) | #414141 | 0.136 |
Harmonies
Hue rotations in OKLCH that keep this color's lightness and chroma.
Complementary
The opposite hue (180°).
- #34378A
#34378A
oklch(38.6% 0.135 276.4)
- #504300
#504300
oklch(38.5% 0.079 96.5)
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 #34378A, 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
- Twilight Blue #0A437A ΔE 0.057
- Sapphire #2138AB ΔE 0.058
- Light Navy #155084 ΔE 0.073
- Marine Blue #01386A ΔE 0.075
- Dusk Blue #26538D ΔE 0.076
Use #34378A 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.