#343C7C
Closest named color: Dark Slate Blue (#483D8B). oklch(38.5% 0.108 274.8), rgb(52, 60, 124).
Aa
White text reads best on this color (10.07:1).
About this color
#343C7C is a dark, moderately saturated blue. In OKLCH its lightness is 38%, its chroma 0.108 and its hue 275°. Its hue sits on the cool side of the wheel. The nearest named color is Dark Slate Blue (#483D8B), ΔE 0.041 away. White text reads best on it, at 10.07:1.
| Hue family | Blues |
| Lightness | dark (38%) |
| Chroma | moderately saturated (0.108) |
| Temperature | cool |
| Nearest name | Dark Slate Blue (#483D8B) |
| Black text | 2.08:1 |
| White text | 10.07:1 |
Values
| HEX | #343C7C |
| RGB | rgb(52, 60, 124) |
| HSL | hsl(233, 41%, 35%) |
| OKLCH | oklch(38.5% 0.108 274.8) |
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 #343C7C | 10.07:1 | AAA | Lc -97.3 | Preferred for body text |
| Black text on #343C7C | 2.08:1 | Fails | Lc 10.7 | Not readable |
| #343C7C text on white | 10.07:1 | AAA | Lc 93.2 | Preferred for body text |
| #343C7C text on black | 2.08:1 | 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
#F3F5FD
oklch(97.1% 0.011 274.9)
-
Step 100
100
#E5E9FA
oklch(93.6% 0.023 275.4)
-
Step 200
200
#D0D8F8
oklch(88.6% 0.045 274.4)
-
Step 300
300
#B1BDF5
oklch(80.9% 0.08 275.1)
-
Step 400
400
#8999F1
oklch(70.7% 0.13 274.8)
-
Step 500
500
#6E7DEB
oklch(63.1% 0.164 274.8)
-
Step 600
600
#5863DA
oklch(55.6% 0.18 274.9)
-
Step 700
700
#4851BD
oklch(49% 0.168 274.8)
-
Step 800
800
#3B4399
oklch(42.6% 0.139 274.9)
-
Step 900
900 (this color)
#343C7C
oklch(38.5% 0.108 274.8)
-
Step 950
950
#1D2247
oklch(26.9% 0.068 275)
#343C7C 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) | #1C457E | 0.034 |
| Deuteranopia (no green cones) | #113F7B | 0.037 |
| Tritanopia (no blue cones) | #0C4A56 | 0.094 |
| Achromatopsia (no color) | #424242 | 0.108 |
Harmonies
Hue rotations in OKLCH that keep this color's lightness and chroma.
Complementary
The opposite hue (180°).
- #343C7C
#343C7C
oklch(38.5% 0.108 274.8)
- #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 #343C7C, closest first.
Similar named colors
The eight closest entries in our named color list, with their ΔE distance.
- Dark Slate Blue #483D8B ΔE 0.041
- Twilight Blue #0A437A ΔE 0.042
- Cobalt #1E488F ΔE 0.046
- Blueberry #464196 ΔE 0.053
- Light Navy #155084 ΔE 0.060
- Marine Blue #01386A ΔE 0.061
- Dusk Blue #26538D ΔE 0.067
- Dark Grey Blue #29465B ΔE 0.072
Use #343C7C 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.