#30109B
Closest named color: Indigo Blue (#3A18B1). oklch(34.7% 0.197 279.1), rgb(48, 16, 155).
Aa
White text reads best on this color (12.55:1).
About this color
#30109B is a dark, vivid blue. In OKLCH its lightness is 35%, its chroma 0.197 and its hue 279°. Its hue sits on the cool side of the wheel. The nearest named color is Indigo Blue (#3A18B1), ΔE 0.044 away. White text reads best on it, at 12.55:1.
| Hue family | Blues |
| Lightness | dark (35%) |
| Chroma | vivid (0.197) |
| Temperature | cool |
| Nearest name | Indigo Blue (#3A18B1) |
| Black text | 1.67:1 |
| White text | 12.55:1 |
Values
| HEX | #30109B |
| RGB | rgb(48, 16, 155) |
| HSL | hsl(254, 81%, 34%) |
| OKLCH | oklch(34.7% 0.197 279.1) |
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 #30109B | 12.55:1 | AAA | Lc -100.5 | Preferred for body text |
| Black text on #30109B | 1.67:1 | Fails | Lc 0.0 | Not readable |
| #30109B text on white | 12.55:1 | AAA | Lc 96.9 | Preferred for body text |
| #30109B text on black | 1.67:1 | 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
#B3BAFF
oklch(80.8% 0.098 279.5)
-
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
#604DFF
oklch(55.6% 0.25 279.3)
-
Step 700
700
#530DFF
oklch(49.1% 0.294 279.1)
-
Step 800
800
#430DD3
oklch(42.7% 0.253 279)
-
Step 900
900 (this color)
#30109B
oklch(34.7% 0.197 279.1)
-
Step 950
950
#1E1661
oklch(27% 0.125 278.7)
#30109B 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) | #00389F | 0.072 |
| Deuteranopia (no green cones) | #002E99 | 0.058 |
| Tritanopia (no blue cones) | #00405A | 0.155 |
| Achromatopsia (no color) | #333333 | 0.199 |
Harmonies
Hue rotations in OKLCH that keep this color's lightness and chroma.
Complementary
The opposite hue (180°).
- #30109B
#30109B
oklch(34.7% 0.197 279.1)
- #433A00
#433A00
oklch(34.7% 0.072 99.5)
Analogous
Neighbouring hues, 30° either side.
Split complementary
The two hues beside the complement (150° and 210°).
Triadic
Three hues spaced 120° apart.
Palettes and gradients that use #30109B
These curated palettes and gradients contain exactly #30109B. Open one to see the full color scheme around it.
Gradients
Similar named colors
The eight closest entries in our named color list, with their ΔE distance.
- Indigo Blue #3A18B1 ΔE 0.044
- Ultramarine #2000B1 ΔE 0.047
- Royal #0C1793 ΔE 0.049
- Imperial Purple #480CA8 ΔE 0.050
- Cobalt Blue #030AA7 ΔE 0.060
- Sapphire #2138AB ΔE 0.072
- Indigo #4B0082 ΔE 0.076
- Dark Blue #00008B ΔE 0.078
Use #30109B 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.