#00305B
Closest named color: Marine (#042E60). oklch(30.7% 0.091 251.5), rgb(0, 48, 91).
Aa
White text reads best on this color (13.34:1).
About this color
#00305B is a dark, moderately saturated blue. In OKLCH its lightness is 31%, its chroma 0.091 and its hue 252°. Its hue sits on the cool side of the wheel. The nearest named color is Marine (#042E60), ΔE 0.012 away. White text reads best on it, at 13.34:1.
| Hue family | Blues |
| Lightness | dark (31%) |
| Chroma | moderately saturated (0.091) |
| Temperature | cool |
| Nearest name | Marine (#042E60) |
| Black text | 1.57:1 |
| White text | 13.34:1 |
Values
| HEX | #00305B |
| RGB | rgb(0, 48, 91) |
| HSL | hsl(208, 100%, 18%) |
| OKLCH | oklch(30.7% 0.091 251.5) |
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 #00305B | 13.34:1 | AAA | Lc -102.5 | Preferred for body text |
| Black text on #00305B | 1.57:1 | Fails | Lc 0.0 | Not readable |
| #00305B text on white | 13.34:1 | AAA | Lc 99.3 | Preferred for body text |
| #00305B text on black | 1.57:1 | 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 950.
-
Step 50
50
#EFF6FF
oklch(97% 0.014 254.6)
-
Step 100
100
#DBECFF
oklch(93.6% 0.032 251.1)
-
Step 200
200
#BEDDFF
oklch(88.6% 0.058 250.9)
-
Step 300
300
#91C5FF
oklch(80.9% 0.099 251.8)
-
Step 400
400
#4CA4FF
oklch(70.7% 0.158 251.7)
-
Step 500
500
#008BF5
oklch(63.2% 0.186 251.5)
-
Step 600
600
#0074CF
oklch(55.5% 0.165 251.7)
-
Step 700
700
#0062AF
oklch(49.2% 0.144 251.3)
-
Step 800
800
#005091
oklch(42.8% 0.126 251.5)
-
Step 900
900
#00427A
oklch(37.7% 0.112 251.7)
-
Step 950
950 (this color)
#00305B
oklch(30.7% 0.091 251.5)
#00305B 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) | #19335D | 0.023 |
| Deuteranopia (no green cones) | #052C5A | 0.012 |
| Tritanopia (no blue cones) | #003A41 | 0.064 |
| Achromatopsia (no color) | #2F2F2F | 0.091 |
Harmonies
Hue rotations in OKLCH that keep this color's lightness and chroma.
Complementary
The opposite hue (180°).
- #00305B
#00305B
oklch(30.7% 0.091 251.5)
- #442900
#442900
oklch(30.7% 0.066 71.4)
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 #00305B, closest first.
Similar named colors
The eight closest entries in our named color list, with their ΔE distance.
- Marine #042E60 ΔE 0.012
- Prussian Blue #1D3557 ΔE 0.032
- Marine Blue #01386A ΔE 0.034
- Midnight Green #073B4C ΔE 0.051
- Dark Blue Grey #1F3B4D ΔE 0.056
- Space Cadet #2B2D42 ΔE 0.060
- Gunmetal #293241 ΔE 0.062
- Oxford Blue #1B263B ΔE 0.062
Use #00305B 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.