#3A397C
Closest named color: Dark Slate Blue (#483D8B). oklch(38.3% 0.111 280.5), rgb(58, 57, 124).
Aa
White text reads best on this color (10.21:1).
About this color
#3A397C is a dark, moderately saturated purple. In OKLCH its lightness is 38%, its chroma 0.111 and its hue 280°. Its hue sits on the cool side of the wheel. The nearest named color is Dark Slate Blue (#483D8B), ΔE 0.036 away. White text reads best on it, at 10.21:1.
| Hue family | Purples |
| Lightness | dark (38%) |
| Chroma | moderately saturated (0.111) |
| Temperature | cool |
| Nearest name | Dark Slate Blue (#483D8B) |
| Black text | 2.05:1 |
| White text | 10.21:1 |
Values
| HEX | #3A397C |
| RGB | rgb(58, 57, 124) |
| HSL | hsl(241, 37%, 35%) |
| OKLCH | oklch(38.3% 0.111 280.5) |
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 #3A397C | 10.21:1 | AAA | Lc -97.6 | Preferred for body text |
| Black text on #3A397C | 2.05:1 | Fails | Lc 10.4 | Not readable |
| #3A397C text on white | 10.21:1 | AAA | Lc 93.5 | Preferred for body text |
| #3A397C text on black | 2.05:1 | Fails | Lc -9.0 | 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
#F4F5FD
oklch(97.2% 0.011 280.5)
-
Step 100
100
#E6E8FA
oklch(93.5% 0.024 280.9)
-
Step 200
200
#D3D6F8
oklch(88.5% 0.047 281.4)
-
Step 300
300
#B6BBF6
oklch(80.9% 0.083 280.6)
-
Step 400
400
#9296F1
oklch(70.8% 0.132 280.5)
-
Step 500
500
#7979EC
oklch(63.1% 0.169 280.4)
-
Step 600
600
#645EDB
oklch(55.6% 0.185 280.7)
-
Step 700
700
#534DBE
oklch(49.1% 0.172 280.4)
-
Step 800
800
#444099
oklch(42.7% 0.141 280.6)
-
Step 900
900 (this color)
#3A397C
oklch(38.3% 0.111 280.5)
-
Step 950
950
#212147
oklch(27% 0.069 280.7)
#3A397C 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) | #16447E | 0.047 |
| Deuteranopia (no green cones) | #0F3E7B | 0.048 |
| Tritanopia (no blue cones) | #1F4854 | 0.097 |
| Achromatopsia (no color) | #414141 | 0.111 |
Harmonies
Hue rotations in OKLCH that keep this color's lightness and chroma.
Complementary
The opposite hue (180°).
- #3A397C
#3A397C
oklch(38.3% 0.111 280.5)
- #4D4400
#4D4400
oklch(38.4% 0.08 100.8)
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 #3A397C, closest first.
Similar named colors
The eight closest entries in our named color list, with their ΔE distance.
- Dark Slate Blue #483D8B ΔE 0.036
- Blueberry #464196 ΔE 0.051
- Twilight Blue #0A437A ΔE 0.053
- Cobalt #1E488F ΔE 0.054
- Marine Blue #01386A ΔE 0.068
- Light Navy #155084 ΔE 0.069
- Dusk Blue #26538D ΔE 0.074
- Twilight #4E518B ΔE 0.078
Use #3A397C 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.