#3C437B
Closest named color: Dark Slate Blue (#483D8B). oklch(40.5% 0.094 276), rgb(60, 67, 123).
Aa
White text reads best on this color (9.20:1).
About this color
#3C437B is a dark, moderately saturated blue. In OKLCH its lightness is 41%, its chroma 0.094 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 9.20:1.
| Hue family | Blues |
| Lightness | dark (41%) |
| Chroma | moderately saturated (0.094) |
| Temperature | cool |
| Nearest name | Dark Slate Blue (#483D8B) |
| Black text | 2.28:1 |
| White text | 9.20:1 |
Values
| HEX | #3C437B |
| RGB | rgb(60, 67, 123) |
| HSL | hsl(233, 34%, 36%) |
| OKLCH | oklch(40.5% 0.094 276) |
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 #3C437B | 9.20:1 | AAA | Lc -95.4 | Preferred for body text |
| Black text on #3C437B | 2.28:1 | Fails | Lc 12.9 | Not readable |
| #3C437B text on white | 9.20:1 | AAA | Lc 91.1 | Preferred for body text |
| #3C437B text on black | 2.28:1 | Fails | Lc -11.2 | 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 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
#B6BEE5
oklch(80.8% 0.056 276)
-
Step 400
400
#919CD7
oklch(70.6% 0.087 275.8)
-
Step 500
500
#7783CD
oklch(63.2% 0.112 275.7)
-
Step 600
600
#616BBA
oklch(55.6% 0.122 276.2)
-
Step 700
700
#5059A0
oklch(49.1% 0.113 276)
-
Step 800
800 (this color)
#3C437B
oklch(40.5% 0.094 276)
-
Step 900
900
#373D68
oklch(37.6% 0.074 276.2)
-
Step 950
950
#20243D
oklch(26.9% 0.047 275.9)
#3C437B 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 | 0.026 |
| Deuteranopia (no green cones) | #26457A | 0.028 |
| Tritanopia (no blue cones) | #234F59 | 0.083 |
| Achromatopsia (no color) | #484848 | 0.094 |
Harmonies
Hue rotations in OKLCH that keep this color's lightness and chroma.
Complementary
The opposite hue (180°).
- #3C437B
#3C437B
oklch(40.5% 0.094 276)
- #574800
#574800
oklch(40.5% 0.083 95.4)
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 #3C437B, 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 0.045
- Blueberry #464196 ΔE 0.049
- Light Navy #155084 ΔE 0.049
- Twilight Blue #0A437A ΔE 0.050
- Dusk Blue #26538D ΔE 0.052
- Twilight #4E518B ΔE 0.055
- Dusk #4E5481 ΔE 0.059
Use #3C437B 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.