#303579
Closest named color: Twilight Blue (#0A437A). oklch(36.5% 0.114 276), rgb(48, 53, 121).
Aa
White text reads best on this color (10.98:1).
About this color
#303579 is a dark, moderately saturated blue. In OKLCH its lightness is 36%, its chroma 0.114 and its hue 276°. Its hue sits on the cool side of the wheel. The nearest named color is Twilight Blue (#0A437A), ΔE 0.048 away. White text reads best on it, at 10.98:1.
| Hue family | Blues |
| Lightness | dark (36%) |
| Chroma | moderately saturated (0.114) |
| Temperature | cool |
| Nearest name | Twilight Blue (#0A437A) |
| Black text | 1.91:1 |
| White text | 10.98:1 |
Values
| HEX | #303579 |
| RGB | rgb(48, 53, 121) |
| HSL | hsl(236, 43%, 33%) |
| OKLCH | oklch(36.5% 0.114 276) |
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 #303579 | 10.98:1 | AAA | Lc -99.0 | Preferred for body text |
| Black text on #303579 | 1.91:1 | Fails | Lc 8.7 | Not readable |
| #303579 text on white | 10.98:1 | AAA | Lc 95.2 | Preferred for body text |
| #303579 text on black | 1.91:1 | Fails | Lc -7.5 | 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
#F3F5FD
oklch(97.1% 0.011 274.9)
-
Step 100
100
#E5E9FB
oklch(93.6% 0.025 275.9)
-
Step 200
200
#D0D7F9
oklch(88.5% 0.047 276.2)
-
Step 300
300
#B1BCF8
oklch(80.8% 0.086 276.3)
-
Step 400
400
#8A98F5
oklch(70.8% 0.136 275.9)
-
Step 500
500
#6F7BF1
oklch(63.1% 0.175 275.8)
-
Step 600
600
#5A60E0
oklch(55.6% 0.191 276.2)
-
Step 700
700
#4A4FC2
oklch(49.2% 0.176 275.9)
-
Step 800
800
#3C419D
oklch(42.6% 0.147 275.9)
-
Step 900
900 (this color)
#303579
oklch(36.5% 0.114 276)
-
Step 950
950
#1E2249
oklch(27.1% 0.072 276.1)
#303579 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) | #093F7B | 0.042 |
| Deuteranopia (no green cones) | #003978 | 0.043 |
| Tritanopia (no blue cones) | #014551 | 0.101 |
| Achromatopsia (no color) | #3C3C3C | 0.115 |
Harmonies
Hue rotations in OKLCH that keep this color's lightness and chroma.
Complementary
The opposite hue (180°).
- #303579
#303579
oklch(36.5% 0.114 276)
- #4A3E00
#4A3E00
oklch(36.5% 0.075 96.7)
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 #303579, closest first.
Similar named colors
The eight closest entries in our named color list, with their ΔE distance.
- Twilight Blue #0A437A ΔE 0.048
- Marine Blue #01386A ΔE 0.053
- Dark Slate Blue #483D8B ΔE 0.055
- Cobalt #1E488F ΔE 0.060
- Prussian Blue #1D3557 ΔE 0.066
- Blueberry #464196 ΔE 0.068
- Marine #042E60 ΔE 0.070
- Light Navy #155084 ΔE 0.077
Use #303579 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.