#3F2987
Closest named color: Dark Slate Blue (#483D8B). oklch(36.8% 0.148 287.5), rgb(63, 41, 135).
Aa
White text reads best on this color (11.17:1).
About this color
#3F2987 is a dark, vivid purple. In OKLCH its lightness is 37%, its chroma 0.148 and its hue 288°. Its hue sits on the cool side of the wheel. The nearest named color is Dark Slate Blue (#483D8B), ΔE 0.052 away. White text reads best on it, at 11.17:1.
| Hue family | Purples |
| Lightness | dark (37%) |
| Chroma | vivid (0.148) |
| Temperature | cool |
| Nearest name | Dark Slate Blue (#483D8B) |
| Black text | 1.87:1 |
| White text | 11.17:1 |
Values
| HEX | #3F2987 |
| RGB | rgb(63, 41, 135) |
| HSL | hsl(254, 53%, 35%) |
| OKLCH | oklch(36.8% 0.148 287.5) |
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 #3F2987 | 11.17:1 | AAA | Lc -99.1 | Preferred for body text |
| Black text on #3F2987 | 1.87:1 | Fails | Lc 8.6 | Not readable |
| #3F2987 text on white | 11.17:1 | AAA | Lc 95.3 | Preferred for body text |
| #3F2987 text on black | 1.87:1 | Fails | Lc -7.4 | 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
#F4F4FF
oklch(97% 0.015 286.1)
-
Step 100
100
#E8E7FF
oklch(93.6% 0.032 287.7)
-
Step 200
200
#D6D4FF
oklch(88.5% 0.059 287.3)
-
Step 300
300
#BCB7FF
oklch(80.9% 0.101 287.1)
-
Step 400
400
#9C8DFF
oklch(70.6% 0.163 287.5)
-
Step 500
500
#876BFF
oklch(63.1% 0.211 287.5)
-
Step 600
600
#7445F8
oklch(55.6% 0.248 287.4)
-
Step 700
700
#6234D8
oklch(49.1% 0.23 287.4)
-
Step 800
800
#502EAE
oklch(42.7% 0.189 287.7)
-
Step 900
900 (this color)
#3F2987
oklch(36.8% 0.148 287.5)
-
Step 950
950
#261B51
oklch(27.1% 0.094 287.7)
#3F2987 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) | #003D8A | 0.074 |
| Deuteranopia (no green cones) | #003985 | 0.072 |
| Tritanopia (no blue cones) | #244154 | 0.122 |
| Achromatopsia (no color) | #3B3B3B | 0.149 |
Harmonies
Hue rotations in OKLCH that keep this color's lightness and chroma.
Complementary
The opposite hue (180°).
- #3F2987
#3F2987
oklch(36.8% 0.148 287.5)
- #444200
#444200
oklch(36.9% 0.079 107.8)
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 #3F2987, closest first.
Similar named colors
The eight closest entries in our named color list, with their ΔE distance.
- Dark Slate Blue #483D8B ΔE 0.052
- Indigo #4B0082 ΔE 0.059
- Imperial Purple #480CA8 ΔE 0.063
- Blueberry #464196 ΔE 0.063
- Indigo Blue #3A18B1 ΔE 0.073
- Sapphire #2138AB ΔE 0.078
- Chrysanthemum #560BAD ΔE 0.078
- Royal Purple #4B006E ΔE 0.078
Use #3F2987 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.