#303B80
Closest named color: Twilight Blue (#0A437A). oklch(38.3% 0.116 272.9), rgb(48, 59, 128).
Aa
White text reads best on this color (10.17:1).
About this color
#303B80 is a dark, moderately saturated blue. In OKLCH its lightness is 38%, its chroma 0.116 and its hue 273°. Its hue sits on the cool side of the wheel. The nearest named color is Twilight Blue (#0A437A), ΔE 0.040 away. White text reads best on it, at 10.17:1.
| Hue family | Blues |
| Lightness | dark (38%) |
| Chroma | moderately saturated (0.116) |
| Temperature | cool |
| Nearest name | Twilight Blue (#0A437A) |
| Black text | 2.06:1 |
| White text | 10.17:1 |
Values
| HEX | #303B80 |
| RGB | rgb(48, 59, 128) |
| HSL | hsl(232, 45%, 35%) |
| OKLCH | oklch(38.3% 0.116 272.9) |
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 #303B80 | 10.17:1 | AAA | Lc -97.5 | Preferred for body text |
| Black text on #303B80 | 2.06:1 | Fails | Lc 10.6 | Not readable |
| #303B80 text on white | 10.17:1 | AAA | Lc 93.4 | Preferred for body text |
| #303B80 text on black | 2.06:1 | Fails | Lc -9.1 | 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
#F3F5FE
oklch(97.1% 0.012 276.1)
-
Step 100
100
#E4E9FB
oklch(93.6% 0.025 273.5)
-
Step 200
200
#CED8FA
oklch(88.5% 0.048 272.4)
-
Step 300
300
#AEBDFA
oklch(80.9% 0.088 273.6)
-
Step 400
400
#8499F7
oklch(70.7% 0.14 272.8)
-
Step 500
500
#687CF3
oklch(63% 0.178 273.1)
-
Step 600
600
#5262E2
oklch(55.6% 0.193 273)
-
Step 700
700
#4350C5
oklch(49.1% 0.181 273)
-
Step 800
800
#37429F
oklch(42.7% 0.15 273.2)
-
Step 900
900 (this color)
#303B80
oklch(38.3% 0.116 272.9)
-
Step 950
950
#1B224A
oklch(27% 0.074 273)
#303B80 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) | #134582 | 0.036 |
| Deuteranopia (no green cones) | #003E7F | 0.039 |
| Tritanopia (no blue cones) | #004B57 | 0.101 |
| Achromatopsia (no color) | #414141 | 0.117 |
Harmonies
Hue rotations in OKLCH that keep this color's lightness and chroma.
Complementary
The opposite hue (180°).
- #303B80
#303B80
oklch(38.3% 0.116 272.9)
- #524100
#524100
oklch(38.2% 0.078 91.9)
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 #303B80, closest first.
Similar named colors
The eight closest entries in our named color list, with their ΔE distance.
- Twilight Blue #0A437A ΔE 0.040
- Cobalt #1E488F ΔE 0.042
- Dark Slate Blue #483D8B ΔE 0.043
- Blueberry #464196 ΔE 0.053
- Marine Blue #01386A ΔE 0.060
- Light Navy #155084 ΔE 0.060
- Dusk Blue #26538D ΔE 0.068
- Sapphire #2138AB ΔE 0.073
Use #303B80 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.