#3D437B
Closest named color: Dark Slate Blue (#483D8B). oklch(40.6% 0.093 276.8), rgb(61, 67, 123).
Aa
White text reads best on this color (9.18:1).
About this color
#3D437B is a dark, moderately saturated blue. In OKLCH its lightness is 41%, its chroma 0.093 and its hue 277°. Its hue sits on the cool side of the wheel. The nearest named color is Dark Slate Blue (#483D8B), ΔE 0.037 away. White text reads best on it, at 9.18:1.
| Hue family | Blues |
| Lightness | dark (41%) |
| Chroma | moderately saturated (0.093) |
| Temperature | cool |
| Nearest name | Dark Slate Blue (#483D8B) |
| Black text | 2.28:1 |
| White text | 9.18:1 |
Values
| HEX | #3D437B |
| RGB | rgb(61, 67, 123) |
| HSL | hsl(234, 34%, 36%) |
| OKLCH | oklch(40.6% 0.093 276.8) |
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 #3D437B | 9.18:1 | AAA | Lc -95.4 | Preferred for body text |
| Black text on #3D437B | 2.28:1 | Fails | Lc 12.9 | Not readable |
| #3D437B text on white | 9.18:1 | AAA | Lc 91.0 | Preferred for body text |
| #3D437B text on black | 2.28:1 | Fails | Lc -11.3 | 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 800.
-
Step 50
50
#F4F5FA
oklch(97.1% 0.007 277.2)
-
Step 100
100
#E7E9F5
oklch(93.6% 0.016 278.5)
-
Step 200
200
#D3D8EE
oklch(88.5% 0.031 275.6)
-
Step 300
300
#B7BEE4
oklch(80.9% 0.054 276.9)
-
Step 400
400
#929CD7
oklch(70.7% 0.087 276.5)
-
Step 500
500
#7882CC
oklch(63% 0.112 276.8)
-
Step 600
600
#626BB9
oklch(55.6% 0.121 276.8)
-
Step 700
700
#5159A0
oklch(49.2% 0.113 276.6)
-
Step 800
800 (this color)
#3D437B
oklch(40.6% 0.093 276.8)
-
Step 900
900
#383D68
oklch(37.7% 0.074 277.2)
-
Step 950
950
#21243D
oklch(27% 0.047 277.6)
#3D437B 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) | #2C4A7D | 0.027 |
| Deuteranopia (no green cones) | #27457A | 0.028 |
| Tritanopia (no blue cones) | #254F59 | 0.082 |
| Achromatopsia (no color) | #484848 | 0.094 |
Harmonies
Hue rotations in OKLCH that keep this color's lightness and chroma.
Complementary
The opposite hue (180°).
- #3D437B
#3D437B
oklch(40.6% 0.093 276.8)
- #564900
#564900
oklch(40.6% 0.084 97.5)
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 #3D437B, 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
- Cobalt #1E488F ΔE 0.046
- Blueberry #464196 ΔE 0.048
- Light Navy #155084 ΔE 0.050
- Twilight Blue #0A437A ΔE 0.051
- Dusk Blue #26538D ΔE 0.053
- Twilight #4E518B ΔE 0.054
- Dusk #4E5481 ΔE 0.058
Use #3D437B 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.