#033F77
Closest named color: Twilight Blue (#0A437A). oklch(36.7% 0.111 253), rgb(3, 63, 119).
Aa
White text reads best on this color (10.59:1).
About this color
#033F77 is a dark, moderately saturated blue. In OKLCH its lightness is 37%, its chroma 0.111 and its hue 253°. Its hue sits on the cool side of the wheel. The nearest named color is Twilight Blue (#0A437A), ΔE 0.014 away. White text reads best on it, at 10.59:1.
| Hue family | Blues |
| Lightness | dark (37%) |
| Chroma | moderately saturated (0.111) |
| Temperature | cool |
| Nearest name | Twilight Blue (#0A437A) |
| Black text | 1.98:1 |
| White text | 10.59:1 |
Values
| HEX | #033F77 |
| RGB | rgb(3, 63, 119) |
| HSL | hsl(209, 95%, 24%) |
| OKLCH | oklch(36.7% 0.111 253) |
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 #033F77 | 10.59:1 | AAA | Lc -98.0 | Preferred for body text |
| Black text on #033F77 | 1.98:1 | Fails | Lc 9.9 | Not readable |
| #033F77 text on white | 10.59:1 | AAA | Lc 94.0 | Preferred for body text |
| #033F77 text on black | 1.98:1 | Fails | Lc -8.5 | 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
#F0F6FD
oklch(97.1% 0.011 252.1)
-
Step 100
100
#DFEBFA
oklch(93.6% 0.024 254)
-
Step 200
200
#C4DCF8
oklch(88.6% 0.047 252.4)
-
Step 300
300
#9BC4F5
oklch(80.8% 0.082 253.2)
-
Step 400
400
#61A4F1
oklch(70.7% 0.133 253.1)
-
Step 500
500
#2C8BEC
oklch(63.2% 0.169 252.8)
-
Step 600
600
#0073D3
oklch(55.6% 0.171 252.9)
-
Step 700
700
#0060B3
oklch(49% 0.152 253.2)
-
Step 800
800
#004F94
oklch(42.8% 0.131 252.8)
-
Step 900
900 (this color)
#033F77
oklch(36.7% 0.111 253)
-
Step 950
950
#082747
oklch(27% 0.069 252.5)
#033F77 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) | #204479 | 0.026 |
| Deuteranopia (no green cones) | #033A76 | 0.015 |
| Tritanopia (no blue cones) | #004D55 | 0.082 |
| Achromatopsia (no color) | #3F3F3F | 0.111 |
Harmonies
Hue rotations in OKLCH that keep this color's lightness and chroma.
Complementary
The opposite hue (180°).
- #033F77
#033F77
oklch(36.7% 0.111 253)
- #583700
#583700
oklch(36.7% 0.079 72.2)
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 #033F77, closest first.
Similar named colors
The eight closest entries in our named color list, with their ΔE distance.
- Twilight Blue #0A437A ΔE 0.014
- Marine Blue #01386A ΔE 0.029
- Cobalt #1E488F ΔE 0.052
- Light Navy #155084 ΔE 0.056
- Prussian Blue #1D3557 ΔE 0.059
- Marine #042E60 ΔE 0.062
- Dark Grey Blue #29465B ΔE 0.064
- Deep Sea Blue #015482 ΔE 0.064
Use #033F77 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.