#303878
Closest named color: Twilight Blue (#0A437A). oklch(37% 0.108 274.5), rgb(48, 56, 120).
Aa
White text reads best on this color (10.70:1).
About this color
#303878 is a dark, moderately saturated blue. In OKLCH its lightness is 37%, its chroma 0.108 and its hue 274°. Its hue sits on the cool side of the wheel. The nearest named color is Twilight Blue (#0A437A), ΔE 0.042 away. White text reads best on it, at 10.70:1.
| Hue family | Blues |
| Lightness | dark (37%) |
| Chroma | moderately saturated (0.108) |
| Temperature | cool |
| Nearest name | Twilight Blue (#0A437A) |
| Black text | 1.96:1 |
| White text | 10.70:1 |
Values
| HEX | #303878 |
| RGB | rgb(48, 56, 120) |
| HSL | hsl(233, 43%, 33%) |
| OKLCH | oklch(37% 0.108 274.5) |
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 #303878 | 10.70:1 | AAA | Lc -98.5 | Preferred for body text |
| Black text on #303878 | 1.96:1 | Fails | Lc 9.3 | Not readable |
| #303878 text on white | 10.70:1 | AAA | Lc 94.6 | Preferred for body text |
| #303878 text on black | 1.96:1 | Fails | Lc -8.0 | 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
#F3F5FD
oklch(97.1% 0.011 274.9)
-
Step 100
100
#E5E9FA
oklch(93.6% 0.023 275.4)
-
Step 200
200
#D0D8F8
oklch(88.6% 0.045 274.4)
-
Step 300
300
#B0BDF6
oklch(80.8% 0.082 274.5)
-
Step 400
400
#8899F1
oklch(70.6% 0.13 274.3)
-
Step 500
500
#6D7DEC
oklch(63.1% 0.166 274.5)
-
Step 600
600
#5763DB
oklch(55.6% 0.182 274.6)
-
Step 700
700
#4851BE
oklch(49.1% 0.169 274.7)
-
Step 800
800
#3B4399
oklch(42.6% 0.139 274.9)
-
Step 900
900 (this color)
#303878
oklch(37% 0.108 274.5)
-
Step 950
950
#1D2247
oklch(26.9% 0.068 275)
#303878 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) | #15417A | 0.035 |
| Deuteranopia (no green cones) | #073B77 | 0.038 |
| Tritanopia (no blue cones) | #024752 | 0.097 |
| Achromatopsia (no color) | #3E3E3E | 0.109 |
Harmonies
Hue rotations in OKLCH that keep this color's lightness and chroma.
Complementary
The opposite hue (180°).
- #303878
#303878
oklch(37% 0.108 274.5)
- #4D3F00
#4D3F00
oklch(37.2% 0.076 94.7)
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 #303878, closest first.
Similar named colors
The eight closest entries in our named color list, with their ΔE distance.
- Twilight Blue #0A437A ΔE 0.042
- Marine Blue #01386A ΔE 0.051
- Dark Slate Blue #483D8B ΔE 0.052
- Cobalt #1E488F ΔE 0.055
- Prussian Blue #1D3557 ΔE 0.064
- Blueberry #464196 ΔE 0.066
- Light Navy #155084 ΔE 0.069
- Marine #042E60 ΔE 0.072
Use #303878 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.