#31289F
Closest named color: Indigo Blue (#3A18B1). oklch(37.8% 0.182 276.5), rgb(49, 40, 159).
Aa
White text reads best on this color (10.85:1).
About this color
#31289F is a dark, vivid blue. In OKLCH its lightness is 38%, its chroma 0.182 and its hue 277°. Its hue sits on the cool side of the wheel. The nearest named color is Indigo Blue (#3A18B1), ΔE 0.035 away. White text reads best on it, at 10.85:1.
| Hue family | Blues |
| Lightness | dark (38%) |
| Chroma | vivid (0.182) |
| Temperature | cool |
| Nearest name | Indigo Blue (#3A18B1) |
| Black text | 1.93:1 |
| White text | 10.85:1 |
Values
| HEX | #31289F |
| RGB | rgb(49, 40, 159) |
| HSL | hsl(245, 60%, 39%) |
| OKLCH | oklch(37.8% 0.182 276.5) |
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 #31289F | 10.85:1 | AAA | Lc -98.2 | Preferred for body text |
| Black text on #31289F | 1.93:1 | Fails | Lc 9.7 | Not readable |
| #31289F text on white | 10.85:1 | AAA | Lc 94.2 | Preferred for body text |
| #31289F text on black | 1.93:1 | Fails | Lc -8.3 | 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 900.
-
Step 50
50
#F3F5FF
oklch(97.2% 0.013 277.1)
-
Step 100
100
#E4E9FF
oklch(93.7% 0.03 275.6)
-
Step 200
200
#CFD7FF
oklch(88.6% 0.056 276.3)
-
Step 300
300
#B0BBFF
oklch(80.8% 0.097 276.9)
-
Step 400
400
#8995FF
oklch(70.7% 0.154 276.8)
-
Step 500
500
#6E76FF
oklch(63.1% 0.2 276.5)
-
Step 600
600
#5851FF
oklch(55.6% 0.248 276.5)
-
Step 700
700
#4B23FA
oklch(49.1% 0.282 276.7)
-
Step 800
800
#3C23CA
oklch(42.7% 0.234 276.6)
-
Step 900
900 (this color)
#31289F
oklch(37.8% 0.182 276.5)
-
Step 950
950
#1C1A5D
oklch(27.1% 0.115 276.8)
#31289F 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) | #0042A2 | 0.062 |
| Deuteranopia (no green cones) | #00389D | 0.048 |
| Tritanopia (no blue cones) | #004A61 | 0.146 |
| Achromatopsia (no color) | #3D3D3D | 0.183 |
Harmonies
Hue rotations in OKLCH that keep this color's lightness and chroma.
Complementary
The opposite hue (180°).
- #31289F
#31289F
oklch(37.8% 0.182 276.5)
- #4E4100
#4E4100
oklch(37.8% 0.078 96.2)
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 #31289F, closest first.
Similar named colors
The eight closest entries in our named color list, with their ΔE distance.
- Indigo Blue #3A18B1 ΔE 0.035
- Sapphire #2138AB ΔE 0.040
- Imperial Purple #480CA8 ΔE 0.049
- Ultramarine #2000B1 ΔE 0.058
- Royal #0C1793 ΔE 0.065
- Blueberry #464196 ΔE 0.070
- Cobalt Blue #030AA7 ΔE 0.072
- Dark Slate Blue #483D8B ΔE 0.072
Use #31289F 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.