#3C399B
Closest named color: Blueberry (#464196). oklch(41% 0.155 278.4), rgb(60, 57, 155).
Aa
White text reads best on this color (9.33:1).
About this color
#3C399B is a dark, vivid blue. In OKLCH its lightness is 41%, its chroma 0.155 and its hue 278°. Its hue sits on the cool side of the wheel. The nearest named color is Blueberry (#464196), ΔE 0.028 away. White text reads best on it, at 9.33:1.
| Hue family | Blues |
| Lightness | dark (41%) |
| Chroma | vivid (0.155) |
| Temperature | cool |
| Nearest name | Blueberry (#464196) |
| Black text | 2.25:1 |
| White text | 9.33:1 |
Values
| HEX | #3C399B |
| RGB | rgb(60, 57, 155) |
| HSL | hsl(242, 46%, 42%) |
| OKLCH | oklch(41% 0.155 278.4) |
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 #3C399B | 9.33:1 | AAA | Lc -95.4 | Preferred for body text |
| Black text on #3C399B | 2.25:1 | Fails | Lc 12.9 | Not readable |
| #3C399B text on white | 9.33:1 | AAA | Lc 91.1 | Preferred for body text |
| #3C399B text on black | 2.25:1 | 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
#F3F5FE
oklch(97.1% 0.012 276.1)
-
Step 100
100
#E5E9FC
oklch(93.7% 0.026 276.4)
-
Step 200
200
#D1D7FB
oklch(88.6% 0.05 277.9)
-
Step 300
300
#B3BBFB
oklch(80.9% 0.091 278.6)
-
Step 400
400
#8D95F9
oklch(70.6% 0.145 278.5)
-
Step 500
500
#7477F6
oklch(63.1% 0.186 278.6)
-
Step 600
600
#5F5CE5
oklch(55.6% 0.202 278.6)
-
Step 700
700
#4F4BC7
oklch(49.2% 0.187 278.4)
-
Step 800
800 (this color)
#3C399B
oklch(41% 0.155 278.4)
-
Step 900
900
#36367F
oklch(37.6% 0.12 278.9)
-
Step 950
950
#1F214B
oklch(27.1% 0.076 278)
#3C399B 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) | #004B9E | 0.060 |
| Deuteranopia (no green cones) | #004399 | 0.054 |
| Tritanopia (no blue cones) | #005164 | 0.132 |
| Achromatopsia (no color) | #474747 | 0.155 |
Harmonies
Hue rotations in OKLCH that keep this color's lightness and chroma.
Complementary
The opposite hue (180°).
- #3C399B
#3C399B
oklch(41% 0.155 278.4)
- #564A00
#564A00
oklch(40.9% 0.085 98.6)
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 #3C399B, closest first.
Similar named colors
The eight closest entries in our named color list, with their ΔE distance.
- Blueberry #464196 ΔE 0.028
- Dark Slate Blue #483D8B ΔE 0.035
- Sapphire #2138AB ΔE 0.043
- Cobalt #1E488F ΔE 0.053
- Indigo Blue #3A18B1 ΔE 0.064
- Imperial Purple #480CA8 ΔE 0.069
- Majorelle Blue #3F37C9 ΔE 0.074
- Rebecca Purple #663399 ΔE 0.075
Use #3C399B 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.