#303A5F
Closest named color: Prussian Blue (#1D3557). oklch(35.8% 0.066 271.3), rgb(48, 58, 95).
Aa
White text reads best on this color (11.07:1).
About this color
#303A5F is a dark, muted blue. In OKLCH its lightness is 36%, its chroma 0.066 and its hue 271°. Its hue sits on the cool side of the wheel. The nearest named color is Prussian Blue (#1D3557), ΔE 0.034 away. White text reads best on it, at 11.07:1.
| Hue family | Blues |
| Lightness | dark (36%) |
| Chroma | muted (0.066) |
| Temperature | cool |
| Nearest name | Prussian Blue (#1D3557) |
| Black text | 1.89:1 |
| White text | 11.07:1 |
Values
| HEX | #303A5F |
| RGB | rgb(48, 58, 95) |
| HSL | hsl(227, 33%, 28%) |
| OKLCH | oklch(35.8% 0.066 271.3) |
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 #303A5F | 11.07:1 | AAA | Lc -99.4 | Preferred for body text |
| Black text on #303A5F | 1.89:1 | Fails | Lc 8.4 | Not readable |
| #303A5F text on white | 11.07:1 | AAA | Lc 95.5 | Preferred for body text |
| #303A5F text on black | 1.89:1 | Fails | Lc 0.0 | 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
#F4F5FA
oklch(97.1% 0.007 277.2)
-
Step 100
100
#E6EAF4
oklch(93.7% 0.014 268.5)
-
Step 200
200
#D2D9EC
oklch(88.6% 0.027 269.6)
-
Step 300
300
#B5C0E1
oklch(81% 0.048 270.8)
-
Step 400
400
#8E9ED2
oklch(70.6% 0.079 271.1)
-
Step 500
500
#7386C7
oklch(63.2% 0.101 270.9)
-
Step 600
600
#5C6EB3
oklch(55.5% 0.11 271.4)
-
Step 700
700
#4C5C9A
oklch(49.1% 0.101 271.3)
-
Step 800
800
#3E4B7D
oklch(42.6% 0.085 271.4)
-
Step 900
900 (this color)
#303A5F
oklch(35.8% 0.066 271.3)
-
Step 950
950
#1F253B
oklch(27% 0.042 271.7)
#303A5F 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) | #2C3E60 | 0.013 |
| Deuteranopia (no green cones) | #283A5E | 0.011 |
| Tritanopia (no blue cones) | #1F4248 | 0.059 |
| Achromatopsia (no color) | #3C3C3C | 0.066 |
Harmonies
Hue rotations in OKLCH that keep this color's lightness and chroma.
Complementary
The opposite hue (180°).
- #303A5F
#303A5F
oklch(35.8% 0.066 271.3)
- #493B0B
#493B0B
oklch(35.8% 0.066 91.8)
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 #303A5F, closest first.
Similar named colors
The eight closest entries in our named color list, with their ΔE distance.
- Prussian Blue #1D3557 ΔE 0.034
- Dark Grey Blue #29465B ΔE 0.041
- Dark Blue Grey #1F3B4D ΔE 0.041
- Marine Blue #01386A ΔE 0.048
- Charcoal #264653 ΔE 0.050
- Onyx #343A40 ΔE 0.055
- Twilight Blue #0A437A ΔE 0.056
- Gunmetal #293241 ΔE 0.056
Use #303A5F 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.