#303E80
Closest named color: Twilight Blue (#0A437A). oklch(38.9% 0.112 271.3), rgb(48, 62, 128).
Aa
White text reads best on this color (9.87:1).
About this color
#303E80 is a dark, moderately saturated blue. In OKLCH its lightness is 39%, its chroma 0.112 and its hue 271°. Its hue sits on the cool side of the wheel. The nearest named color is Twilight Blue (#0A437A), ΔE 0.037 away. White text reads best on it, at 9.87:1.
| Hue family | Blues |
| Lightness | dark (39%) |
| Chroma | moderately saturated (0.112) |
| Temperature | cool |
| Nearest name | Twilight Blue (#0A437A) |
| Black text | 2.12:1 |
| White text | 9.87:1 |
Values
| HEX | #303E80 |
| RGB | rgb(48, 62, 128) |
| HSL | hsl(230, 45%, 35%) |
| OKLCH | oklch(38.9% 0.112 271.3) |
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 #303E80 | 9.87:1 | AAA | Lc -96.9 | Preferred for body text |
| Black text on #303E80 | 2.12:1 | Fails | Lc 11.3 | Not readable |
| #303E80 text on white | 9.87:1 | AAA | Lc 92.7 | Preferred for body text |
| #303E80 text on black | 2.12:1 | Fails | Lc -9.8 | 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
#F2F5FD
oklch(97% 0.011 269.6)
-
Step 100
100
#E4E9FB
oklch(93.6% 0.025 273.5)
-
Step 200
200
#CED8F9
oklch(88.5% 0.047 272.1)
-
Step 300
300
#ADBEF8
oklch(80.9% 0.084 271.8)
-
Step 400
400
#829AF4
oklch(70.6% 0.135 271.3)
-
Step 500
500
#657EF0
oklch(63% 0.172 271.4)
-
Step 600
600
#4E64DF
oklch(55.5% 0.188 271.3)
-
Step 700
700
#4052C1
oklch(49% 0.174 271.5)
-
Step 800
800
#34449C
oklch(42.6% 0.144 271.2)
-
Step 900
900 (this color)
#303E80
oklch(38.9% 0.112 271.3)
-
Step 950
950
#1A2349
oklch(27.1% 0.071 270.9)
#303E80 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) | #1B4782 | 0.030 |
| Deuteranopia (no green cones) | #0A407F | 0.034 |
| Tritanopia (no blue cones) | #004D59 | 0.096 |
| Achromatopsia (no color) | #434343 | 0.112 |
Harmonies
Hue rotations in OKLCH that keep this color's lightness and chroma.
Complementary
The opposite hue (180°).
- #303E80
#303E80
oklch(38.9% 0.112 271.3)
- #554300
#554300
oklch(39.1% 0.08 91.4)
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 #303E80, closest first.
Similar named colors
The eight closest entries in our named color list, with their ΔE distance.
- Twilight Blue #0A437A ΔE 0.037
- Cobalt #1E488F ΔE 0.037
- Dark Slate Blue #483D8B ΔE 0.041
- Blueberry #464196 ΔE 0.050
- Light Navy #155084 ΔE 0.053
- Dusk Blue #26538D ΔE 0.060
- Marine Blue #01386A ΔE 0.062
- Deep Sea Blue #015482 ΔE 0.066
Use #303E80 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.