#342F8F
Closest named color: Dark Slate Blue (#483D8B). oklch(37.6% 0.153 278.4), rgb(52, 47, 143).
Aa
White text reads best on this color (10.77:1).
About this color
#342F8F is a dark, vivid blue. In OKLCH its lightness is 38%, its chroma 0.153 and its hue 278°. Its hue sits on the cool side of the wheel. The nearest named color is Dark Slate Blue (#483D8B), ΔE 0.051 away. White text reads best on it, at 10.77:1.
| Hue family | Blues |
| Lightness | dark (38%) |
| Chroma | vivid (0.153) |
| Temperature | cool |
| Nearest name | Dark Slate Blue (#483D8B) |
| Black text | 1.94:1 |
| White text | 10.77:1 |
Values
| HEX | #342F8F |
| RGB | rgb(52, 47, 143) |
| HSL | hsl(243, 51%, 37%) |
| OKLCH | oklch(37.6% 0.153 278.4) |
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 #342F8F | 10.77:1 | AAA | Lc -98.4 | Preferred for body text |
| Black text on #342F8F | 1.94:1 | Fails | Lc 9.5 | Not readable |
| #342F8F text on white | 10.77:1 | AAA | Lc 94.4 | Preferred for body text |
| #342F8F text on black | 1.94:1 | 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
#F3F5FF
oklch(97.2% 0.013 277.1)
-
Step 100
100
#E5E8FF
oklch(93.6% 0.031 279.9)
-
Step 200
200
#D0D6FF
oklch(88.5% 0.057 278.6)
-
Step 300
300
#B2BBFF
oklch(81% 0.097 278.2)
-
Step 400
400
#8C94FF
oklch(70.7% 0.155 278.4)
-
Step 500
500
#7374FF
oklch(63.1% 0.202 278.6)
-
Step 600
600
#5E4EFF
oklch(55.6% 0.25 278.5)
-
Step 700
700
#4E3BE1
oklch(49.1% 0.236 278.3)
-
Step 800
800
#3F33B6
oklch(42.7% 0.196 278.2)
-
Step 900
900 (this color)
#342F8F
oklch(37.6% 0.153 278.4)
-
Step 950
950
#1E1D54
oklch(27% 0.097 278.5)
#342F8F 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) | #004192 | 0.056 |
| Deuteranopia (no green cones) | #003A8D | 0.050 |
| Tritanopia (no blue cones) | #00485A | 0.129 |
| Achromatopsia (no color) | #3E3E3E | 0.153 |
Harmonies
Hue rotations in OKLCH that keep this color's lightness and chroma.
Complementary
The opposite hue (180°).
- #342F8F
#342F8F
oklch(37.6% 0.153 278.4)
- #4C4100
#4C4100
oklch(37.5% 0.078 98.3)
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 #342F8F, closest first.
Similar named colors
The eight closest entries in our named color list, with their ΔE distance.
- Dark Slate Blue #483D8B ΔE 0.051
- Sapphire #2138AB ΔE 0.054
- Blueberry #464196 ΔE 0.056
- Indigo Blue #3A18B1 ΔE 0.063
- Cobalt #1E488F ΔE 0.064
- Imperial Purple #480CA8 ΔE 0.065
- Twilight Blue #0A437A ΔE 0.073
- Royal #0C1793 ΔE 0.075
Use #342F8F 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.