#00357B
Closest named color: Marine Blue (#01386A). oklch(34.6% 0.13 258.3), rgb(0, 53, 123).
Aa
White text reads best on this color (11.69:1).
About this color
#00357B is a dark, moderately saturated blue. In OKLCH its lightness is 35%, its chroma 0.130 and its hue 258°. Its hue sits on the cool side of the wheel. The nearest named color is Marine Blue (#01386A), ΔE 0.031 away. White text reads best on it, at 11.69:1.
| Hue family | Blues |
| Lightness | dark (35%) |
| Chroma | moderately saturated (0.130) |
| Temperature | cool |
| Nearest name | Marine Blue (#01386A) |
| Black text | 1.79:1 |
| White text | 11.69:1 |
Values
| HEX | #00357B |
| RGB | rgb(0, 53, 123) |
| HSL | hsl(214, 100%, 24%) |
| OKLCH | oklch(34.6% 0.13 258.3) |
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 #00357B | 11.69:1 | AAA | Lc -99.9 | Preferred for body text |
| Black text on #00357B | 1.79:1 | Fails | Lc 7.7 | Not readable |
| #00357B text on white | 11.69:1 | AAA | Lc 96.1 | Preferred for body text |
| #00357B text on black | 1.79:1 | 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
#F0F6FE
oklch(97.1% 0.012 255.5)
-
Step 100
100
#DFEBFD
oklch(93.6% 0.028 258.4)
-
Step 200
200
#C4DBFE
oklch(88.6% 0.054 258.7)
-
Step 300
300
#9AC3FF
oklch(81% 0.096 257.8)
-
Step 400
400
#61A0FF
oklch(70.6% 0.154 258.4)
-
Step 500
500
#2F85FF
oklch(63.2% 0.199 258.2)
-
Step 600
600
#006BEA
oklch(55.6% 0.209 258.4)
-
Step 700
700
#005AC6
oklch(49.1% 0.184 258.2)
-
Step 800
800
#0049A4
oklch(42.7% 0.16 258.3)
-
Step 900
900 (this color)
#00357B
oklch(34.6% 0.13 258.3)
-
Step 950
950
#09254E
oklch(27.1% 0.083 258.4)
#00357B 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) | #003E7D | 0.026 |
| Deuteranopia (no green cones) | #00337A | 0.006 |
| Tritanopia (no blue cones) | #004752 | 0.099 |
| Achromatopsia (no color) | #383838 | 0.130 |
Harmonies
Hue rotations in OKLCH that keep this color's lightness and chroma.
Complementary
The opposite hue (180°).
- #00357B
#00357B
oklch(34.6% 0.13 258.3)
- #4E3400
#4E3400
oklch(34.7% 0.072 77.9)
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 #00357B, closest first.
Similar named colors
The eight closest entries in our named color list, with their ΔE distance.
- Marine Blue #01386A ΔE 0.031
- Twilight Blue #0A437A ΔE 0.042
- Marine #042E60 ΔE 0.050
- Prussian Blue #1D3557 ΔE 0.065
- Cobalt #1E488F ΔE 0.068
- Midnight Blue #191970 ΔE 0.069
- Royal #0C1793 ΔE 0.070
- Light Navy #155084 ΔE 0.082
Use #00357B 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.