#303A68
Closest named color: Prussian Blue (#1D3557). oklch(36.3% 0.08 272.6), rgb(48, 58, 104).
Aa
White text reads best on this color (10.87:1).
About this color
#303A68 is a dark, moderately saturated blue. In OKLCH its lightness is 36%, its chroma 0.080 and its hue 273°. Its hue sits on the cool side of the wheel. The nearest named color is Prussian Blue (#1D3557), ΔE 0.043 away. White text reads best on it, at 10.87:1.
| Hue family | Blues |
| Lightness | dark (36%) |
| Chroma | moderately saturated (0.080) |
| Temperature | cool |
| Nearest name | Prussian Blue (#1D3557) |
| Black text | 1.93:1 |
| White text | 10.87:1 |
Values
| HEX | #303A68 |
| RGB | rgb(48, 58, 104) |
| HSL | hsl(229, 37%, 30%) |
| OKLCH | oklch(36.3% 0.08 272.6) |
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 #303A68 | 10.87:1 | AAA | Lc -99.0 | Preferred for body text |
| Black text on #303A68 | 1.93:1 | Fails | Lc 8.8 | Not readable |
| #303A68 text on white | 10.87:1 | AAA | Lc 95.1 | Preferred for body text |
| #303A68 text on black | 1.93:1 | Fails | Lc -7.6 | 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
#F3F5FB
oklch(97% 0.008 271.3)
-
Step 100
100
#E6E9F6
oklch(93.6% 0.018 275.6)
-
Step 200
200
#D1D8F0
oklch(88.4% 0.034 272.8)
-
Step 300
300
#B3BFE8
oklch(80.9% 0.06 272.2)
-
Step 400
400
#8C9DDD
oklch(70.7% 0.096 272.3)
-
Step 500
500
#7183D4
oklch(63.1% 0.124 272.9)
-
Step 600
600
#5A6BC1
oklch(55.6% 0.134 272.9)
-
Step 700
700
#4A59A7
oklch(49.1% 0.125 272.8)
-
Step 800
800
#3C4987
oklch(42.6% 0.104 272.4)
-
Step 900
900 (this color)
#303A68
oklch(36.3% 0.08 272.6)
-
Step 950
950
#1E243F
oklch(26.9% 0.051 273)
#303A68 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) | #273F6A | 0.017 |
| Deuteranopia (no green cones) | #223B67 | 0.018 |
| Tritanopia (no blue cones) | #18444C | 0.071 |
| Achromatopsia (no color) | #3D3D3D | 0.080 |
Harmonies
Hue rotations in OKLCH that keep this color's lightness and chroma.
Complementary
The opposite hue (180°).
- #303A68
#303A68
oklch(36.3% 0.08 272.6)
- #4C3C00
#4C3C00
oklch(36.3% 0.074 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 #303A68, closest first.
Similar named colors
The eight closest entries in our named color list, with their ΔE distance.
- Prussian Blue #1D3557 ΔE 0.043
- Marine Blue #01386A ΔE 0.045
- Twilight Blue #0A437A ΔE 0.046
- Dark Grey Blue #29465B ΔE 0.049
- Dark Blue Grey #1F3B4D ΔE 0.055
- Charcoal #264653 ΔE 0.060
- Marine #042E60 ΔE 0.065
- Midnight Green #073B4C ΔE 0.068
Use #303A68 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.