#303191
Closest named color: Sapphire (#2138AB). oklch(37.8% 0.154 275.7), rgb(48, 49, 145).
Aa
White text reads best on this color (10.63:1).
About this color
#303191 is a dark, vivid blue. In OKLCH its lightness is 38%, its chroma 0.154 and its hue 276°. Its hue sits on the cool side of the wheel. The nearest named color is Sapphire (#2138AB), ΔE 0.048 away. White text reads best on it, at 10.63:1.
| Hue family | Blues |
| Lightness | dark (38%) |
| Chroma | vivid (0.154) |
| Temperature | cool |
| Nearest name | Sapphire (#2138AB) |
| Black text | 1.97:1 |
| White text | 10.63:1 |
Values
| HEX | #303191 |
| RGB | rgb(48, 49, 145) |
| HSL | hsl(239, 50%, 38%) |
| OKLCH | oklch(37.8% 0.154 275.7) |
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 #303191 | 10.63:1 | AAA | Lc -98.1 | Preferred for body text |
| Black text on #303191 | 1.97:1 | Fails | Lc 9.8 | Not readable |
| #303191 text on white | 10.63:1 | AAA | Lc 94.1 | Preferred for body text |
| #303191 text on black | 1.97:1 | Fails | Lc -8.4 | 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
#F3F5FF
oklch(97.2% 0.013 277.1)
-
Step 100
100
#E4E9FF
oklch(93.7% 0.03 275.6)
-
Step 200
200
#CED7FF
oklch(88.5% 0.056 275.2)
-
Step 300
300
#AFBCFF
oklch(80.9% 0.096 275.6)
-
Step 400
400
#8796FF
oklch(70.7% 0.154 275.6)
-
Step 500
500
#6C77FF
oklch(63.2% 0.199 275.6)
-
Step 600
600
#5652FF
oklch(55.6% 0.247 275.8)
-
Step 700
700
#473DE3
oklch(49.1% 0.238 275.7)
-
Step 800
800
#3935B7
oklch(42.7% 0.197 275.5)
-
Step 900
900 (this color)
#303191
oklch(37.8% 0.154 275.7)
-
Step 950
950
#1B1E55
oklch(27% 0.098 275.3)
#303191 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) | #004394 | 0.052 |
| Deuteranopia (no green cones) | #003A8F | 0.042 |
| Tritanopia (no blue cones) | #004A5C | 0.127 |
| Achromatopsia (no color) | #3E3E3E | 0.155 |
Harmonies
Hue rotations in OKLCH that keep this color's lightness and chroma.
Complementary
The opposite hue (180°).
- #303191
#303191
oklch(37.8% 0.154 275.7)
- #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 #303191, closest first.
Similar named colors
The eight closest entries in our named color list, with their ΔE distance.
- Sapphire #2138AB ΔE 0.048
- Dark Slate Blue #483D8B ΔE 0.053
- Blueberry #464196 ΔE 0.056
- Cobalt #1E488F ΔE 0.059
- Indigo Blue #3A18B1 ΔE 0.062
- Imperial Purple #480CA8 ΔE 0.069
- Twilight Blue #0A437A ΔE 0.069
- Royal #0C1793 ΔE 0.073
Use #303191 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.