#312C85
Closest named color: Dark Slate Blue (#483D8B). oklch(35.9% 0.144 278.8), rgb(49, 44, 133).
Aa
White text reads best on this color (11.47:1).
About this color
#312C85 is a dark, vivid blue. In OKLCH its lightness is 36%, its chroma 0.144 and its hue 279°. Its hue sits on the cool side of the wheel. The nearest named color is Dark Slate Blue (#483D8B), ΔE 0.061 away. White text reads best on it, at 11.47:1.
| Hue family | Blues |
| Lightness | dark (36%) |
| Chroma | vivid (0.144) |
| Temperature | cool |
| Nearest name | Dark Slate Blue (#483D8B) |
| Black text | 1.82:1 |
| White text | 11.47:1 |
Values
| HEX | #312C85 |
| RGB | rgb(49, 44, 133) |
| HSL | hsl(243, 50%, 35%) |
| OKLCH | oklch(35.9% 0.144 278.8) |
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 #312C85 | 11.47:1 | AAA | Lc -99.7 | Preferred for body text |
| Black text on #312C85 | 1.82:1 | Fails | Lc 8.0 | Not readable |
| #312C85 text on white | 11.47:1 | AAA | Lc 95.9 | Preferred for body text |
| #312C85 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
#F3F5FF
oklch(97.2% 0.013 277.1)
-
Step 100
100
#E5E8FF
oklch(93.6% 0.031 279.9)
-
Step 200
200
#D0D6FF
oklch(88.5% 0.057 278.6)
-
Step 300
300
#B2BAFF
oklch(80.8% 0.098 278.8)
-
Step 400
400
#8D94FF
oklch(70.8% 0.155 278.8)
-
Step 500
500
#7474FF
oklch(63.2% 0.201 278.9)
-
Step 600
600
#5F51F9
oklch(55.6% 0.239 278.9)
-
Step 700
700
#4F40D9
oklch(49.1% 0.222 278.8)
-
Step 800
800
#4036B0
oklch(42.7% 0.185 278.7)
-
Step 900
900 (this color)
#312C85
oklch(35.9% 0.144 278.8)
-
Step 950
950
#1F1E51
oklch(27% 0.091 279.3)
#312C85 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) | #003D88 | 0.055 |
| Deuteranopia (no green cones) | #003683 | 0.048 |
| Tritanopia (no blue cones) | #004354 | 0.121 |
| Achromatopsia (no color) | #393939 | 0.144 |
Harmonies
Hue rotations in OKLCH that keep this color's lightness and chroma.
Complementary
The opposite hue (180°).
- #312C85
#312C85
oklch(35.9% 0.144 278.8)
- #473D00
#473D00
oklch(35.9% 0.074 98.8)
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 #312C85, closest first.
No curated palette has a color within ΔE 0.04 of #312C85.
Similar named colors
The eight closest entries in our named color list, with their ΔE distance.
- Dark Slate Blue #483D8B ΔE 0.061
- Twilight Blue #0A437A ΔE 0.070
- Royal #0C1793 ΔE 0.070
- Sapphire #2138AB ΔE 0.070
- Blueberry #464196 ΔE 0.070
- Marine Blue #01386A ΔE 0.072
- Cobalt #1E488F ΔE 0.072
- Midnight Blue #191970 ΔE 0.072
Use #312C85 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.