#003755
Closest named color: Prussian Blue (#1D3557). oklch(32.1% 0.074 240.5), rgb(0, 55, 85).
Aa
White text reads best on this color (12.51:1).
About this color
#003755 is a dark, moderately saturated blue. In OKLCH its lightness is 32%, its chroma 0.074 and its hue 240°. 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 12.51:1.
| Hue family | Blues |
| Lightness | dark (32%) |
| Chroma | moderately saturated (0.074) |
| Temperature | cool |
| Nearest name | Prussian Blue (#1D3557) |
| Black text | 1.67:1 |
| White text | 12.51:1 |
Values
| HEX | #003755 |
| RGB | rgb(0, 55, 85) |
| HSL | hsl(201, 100%, 17%) |
| OKLCH | oklch(32.1% 0.074 240.5) |
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 #003755 | 12.51:1 | AAA | Lc -101.4 | Preferred for body text |
| Black text on #003755 | 1.67:1 | Fails | Lc 0.0 | Not readable |
| #003755 text on white | 12.51:1 | AAA | Lc 98.0 | Preferred for body text |
| #003755 text on black | 1.67:1 | 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
#EFF7FD
oklch(97.2% 0.012 239.9)
-
Step 100
100
#DBEDFA
oklch(93.7% 0.026 239.1)
-
Step 200
200
#BDDEF7
oklch(88.5% 0.049 240.8)
-
Step 300
300
#8CC9F4
oklch(81% 0.087 239.9)
-
Step 400
400
#3AAAEF
oklch(70.6% 0.141 240.6)
-
Step 500
500
#0092D8
oklch(63% 0.146 240.6)
-
Step 600
600
#007BB6
oklch(55.6% 0.128 240.2)
-
Step 700
700
#00679A
oklch(49.1% 0.113 240.5)
-
Step 800
800
#00547F
oklch(42.6% 0.099 240.7)
-
Step 900
900
#00466B
oklch(37.7% 0.087 240.8)
-
Step 950
950 (this color)
#003755
oklch(32.1% 0.074 240.5)
#003755 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) | #283856 | 0.036 |
| Deuteranopia (no green cones) | #1D3054 | 0.029 |
| Tritanopia (no blue cones) | #003F42 | 0.050 |
| Achromatopsia (no color) | #343434 | 0.074 |
Harmonies
Hue rotations in OKLCH that keep this color's lightness and chroma.
Complementary
The opposite hue (180°).
- #003755
#003755
oklch(32.1% 0.074 240.5)
- #4E2801
#4E2801
oklch(32.1% 0.075 59.6)
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 #003755, 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 0.024
- Dark Blue Grey #1F3B4D ΔE 0.033
- Marine Blue #01386A ΔE 0.037
- Marine #042E60 ΔE 0.037
- Gunmetal #293241 ΔE 0.048
- Space Cadet #2B2D42 ΔE 0.053
- Charcoal #264653 ΔE 0.063
Use #003755 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.