#40287F
Closest named color: Indigo (#4B0082). oklch(36% 0.139 290.4), rgb(64, 40, 127).
Aa
White text reads best on this color (11.48:1).
About this color
#40287F is a dark, moderately saturated purple. In OKLCH its lightness is 36%, its chroma 0.139 and its hue 290°. Its hue sits between the warm and cool halves of the wheel. The nearest named color is Indigo (#4B0082), ΔE 0.055 away. White text reads best on it, at 11.48:1.
| Hue family | Purples |
| Lightness | dark (36%) |
| Chroma | moderately saturated (0.139) |
| Temperature | in between |
| Nearest name | Indigo (#4B0082) |
| Black text | 1.82:1 |
| White text | 11.48:1 |
Values
| HEX | #40287F |
| RGB | rgb(64, 40, 127) |
| HSL | hsl(257, 52%, 33%) |
| OKLCH | oklch(36% 0.139 290.4) |
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 #40287F | 11.48:1 | AAA | Lc -99.7 | Preferred for body text |
| Black text on #40287F | 1.82:1 | Fails | Lc 7.9 | Not readable |
| #40287F text on white | 11.48:1 | AAA | Lc 96.0 | Preferred for body text |
| #40287F text on black | 1.82:1 | Fails | Lc 0.0 | 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
#F5F4FE
oklch(97.1% 0.013 290.8)
-
Step 100
100
#E9E7FD
oklch(93.6% 0.03 290)
-
Step 200
200
#D8D3FE
oklch(88.5% 0.059 290.5)
-
Step 300
300
#C0B5FF
oklch(80.9% 0.104 290.7)
-
Step 400
400
#A18BFF
oklch(70.7% 0.166 290.2)
-
Step 500
500
#8D68FE
oklch(63.1% 0.213 290.3)
-
Step 600
600
#7949ED
oklch(55.6% 0.231 290.2)
-
Step 700
700
#6738CE
oklch(49.1% 0.215 290.6)
-
Step 800
800
#5330A7
oklch(42.7% 0.179 290.2)
-
Step 900
900 (this color)
#40287F
oklch(36% 0.139 290.4)
-
Step 950
950
#281B4D
oklch(26.9% 0.088 291.3)
#40287F 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) | #003B82 | 0.077 |
| Deuteranopia (no green cones) | #00377D | 0.076 |
| Tritanopia (no blue cones) | #2C3D50 | 0.111 |
| Achromatopsia (no color) | #393939 | 0.140 |
Harmonies
Hue rotations in OKLCH that keep this color's lightness and chroma.
Complementary
The opposite hue (180°).
- #40287F
#40287F
oklch(36% 0.139 290.4)
- #404000
#404000
oklch(36% 0.078 109.8)
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 #40287F, closest first.
Similar named colors
The eight closest entries in our named color list, with their ΔE distance.
- Indigo #4B0082 ΔE 0.055
- Dark Slate Blue #483D8B ΔE 0.057
- Royal Purple #4B006E ΔE 0.069
- Blueberry #464196 ΔE 0.071
- Imperial Purple #480CA8 ΔE 0.074
- Midnight Blue #191970 ΔE 0.084
- Indigo Blue #3A18B1 ΔE 0.086
- Twilight Blue #0A437A ΔE 0.087
Use #40287F 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.