#00356B
Closest named color: Marine Blue (#01386A). oklch(33.2% 0.107 254.4), rgb(0, 53, 107).
Aa
White text reads best on this color (12.19:1).
About this color
#00356B is a dark, moderately saturated blue. In OKLCH its lightness is 33%, its chroma 0.107 and its hue 254°. Its hue sits on the cool side of the wheel. The nearest named color is Marine Blue (#01386A), ΔE 0.010 away. White text reads best on it, at 12.19:1.
| Hue family | Blues |
| Lightness | dark (33%) |
| Chroma | moderately saturated (0.107) |
| Temperature | cool |
| Nearest name | Marine Blue (#01386A) |
| Black text | 1.72:1 |
| White text | 12.19:1 |
Values
| HEX | #00356B |
| RGB | rgb(0, 53, 107) |
| HSL | hsl(210, 100%, 21%) |
| OKLCH | oklch(33.2% 0.107 254.4) |
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 #00356B | 12.19:1 | AAA | Lc -100.8 | Preferred for body text |
| Black text on #00356B | 1.72:1 | Fails | Lc 0.0 | Not readable |
| #00356B text on white | 12.19:1 | AAA | Lc 97.2 | Preferred for body text |
| #00356B text on black | 1.72:1 | 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
#F1F6FD
oklch(97.1% 0.011 256.7)
-
Step 100
100
#E0EBFA
oklch(93.6% 0.024 256.1)
-
Step 200
200
#C6DBF7
oklch(88.5% 0.045 255.6)
-
Step 300
300
#9DC4F4
oklch(80.9% 0.08 253.9)
-
Step 400
400
#66A3EF
oklch(70.6% 0.129 254.7)
-
Step 500
500
#378AEA
oklch(63.1% 0.165 254.5)
-
Step 600
600
#0172D8
oklch(55.7% 0.178 254.2)
-
Step 700
700
#005FB7
oklch(49.1% 0.158 254.4)
-
Step 800
800
#004E97
oklch(42.8% 0.136 254.1)
-
Step 900
900 (this color)
#00356B
oklch(33.2% 0.107 254.4)
-
Step 950
950
#0B2747
oklch(27.1% 0.068 254.1)
#00356B 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) | #153A6D | 0.022 |
| Deuteranopia (no green cones) | #00316A | 0.012 |
| Tritanopia (no blue cones) | #00424A | 0.080 |
| Achromatopsia (no color) | #353535 | 0.107 |
Harmonies
Hue rotations in OKLCH that keep this color's lightness and chroma.
Complementary
The opposite hue (180°).
- #00356B
#00356B
oklch(33.2% 0.107 254.4)
- #4B3000
#4B3000
oklch(33.3% 0.07 75)
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 #00356B, closest first.
Similar named colors
The eight closest entries in our named color list, with their ΔE distance.
- Marine Blue #01386A ΔE 0.010
- Marine #042E60 ΔE 0.027
- Prussian Blue #1D3557 ΔE 0.040
- Twilight Blue #0A437A ΔE 0.049
- Midnight Green #073B4C ΔE 0.062
- Dark Blue Grey #1F3B4D ΔE 0.064
- Midnight Blue #191970 ΔE 0.070
- Dark Grey Blue #29465B ΔE 0.077
Use #00356B 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.