#003A5B
Closest named color: Prussian Blue (#1D3557). oklch(33.4% 0.079 241.8), rgb(0, 58, 91).
Aa
White text reads best on this color (11.95:1).
About this color
#003A5B is a dark, moderately saturated blue. In OKLCH its lightness is 33%, its chroma 0.079 and its hue 242°. Its hue sits on the cool side of the wheel. The nearest named color is Prussian Blue (#1D3557), ΔE 0.023 away. White text reads best on it, at 11.95:1.
| Hue family | Blues |
| Lightness | dark (33%) |
| Chroma | moderately saturated (0.079) |
| Temperature | cool |
| Nearest name | Prussian Blue (#1D3557) |
| Black text | 1.75:1 |
| White text | 11.95:1 |
Values
| HEX | #003A5B |
| RGB | rgb(0, 58, 91) |
| HSL | hsl(202, 100%, 18%) |
| OKLCH | oklch(33.4% 0.079 241.8) |
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 #003A5B | 11.95:1 | AAA | Lc -100.5 | Preferred for body text |
| Black text on #003A5B | 1.75:1 | Fails | Lc 0.0 | Not readable |
| #003A5B text on white | 11.95:1 | AAA | Lc 96.9 | Preferred for body text |
| #003A5B text on black | 1.75:1 | 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
#F1F6FA
oklch(97.1% 0.008 241.7)
-
Step 100
100
#E0ECF5
oklch(93.7% 0.018 240)
-
Step 200
200
#C7DCED
oklch(88.4% 0.033 242.4)
-
Step 300
300
#9FC6E4
oklch(80.9% 0.06 241.6)
-
Step 400
400
#69A8D7
oklch(70.8% 0.095 242.1)
-
Step 500
500
#3A91CC
oklch(63.1% 0.121 242.1)
-
Step 600
600
#007AB9
oklch(55.5% 0.132 242.1)
-
Step 700
700
#00679C
oklch(49.2% 0.116 241.5)
-
Step 800
800
#005481
oklch(42.7% 0.101 241.9)
-
Step 900
900 (this color)
#003A5B
oklch(33.4% 0.079 241.8)
-
Step 950
950
#0C293D
oklch(27% 0.051 242.2)
#003A5B 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) | #2A3B5C | 0.037 |
| Deuteranopia (no green cones) | #1D335A | 0.028 |
| Tritanopia (no blue cones) | #004246 | 0.052 |
| Achromatopsia (no color) | #373737 | 0.079 |
Harmonies
Hue rotations in OKLCH that keep this color's lightness and chroma.
Complementary
The opposite hue (180°).
- #003A5B
#003A5B
oklch(33.4% 0.079 241.8)
- #522B00
#522B00
oklch(33.3% 0.077 61)
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 #003A5B, closest first.
Similar named colors
The eight closest entries in our named color list, with their ΔE distance.
- Prussian Blue #1D3557 ΔE 0.023
- Midnight Green #073B4C ΔE 0.028
- Marine Blue #01386A ΔE 0.029
- Dark Blue Grey #1F3B4D ΔE 0.033
- Marine #042E60 ΔE 0.040
- Gunmetal #293241 ΔE 0.055
- Dark Grey Blue #29465B ΔE 0.055
- Charcoal #264653 ΔE 0.057
Use #003A5B 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.