#033991
Closest named color: Cobalt (#1E488F). oklch(37.6% 0.155 260.7), rgb(3, 57, 145).
Aa
White text reads best on this color (10.51:1).
About this color
#033991 is a dark, vivid blue. In OKLCH its lightness is 38%, its chroma 0.155 and its hue 261°. Its hue sits on the cool side of the wheel. The nearest named color is Cobalt (#1E488F), ΔE 0.047 away. White text reads best on it, at 10.51:1.
| Hue family | Blues |
| Lightness | dark (38%) |
| Chroma | vivid (0.155) |
| Temperature | cool |
| Nearest name | Cobalt (#1E488F) |
| Black text | 1.99:1 |
| White text | 10.51:1 |
Values
| HEX | #033991 |
| RGB | rgb(3, 57, 145) |
| HSL | hsl(217, 96%, 29%) |
| OKLCH | oklch(37.6% 0.155 260.7) |
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 #033991 | 10.51:1 | AAA | Lc -97.6 | Preferred for body text |
| Black text on #033991 | 1.99:1 | Fails | Lc 10.4 | Not readable |
| #033991 text on white | 10.51:1 | AAA | Lc 93.6 | Preferred for body text |
| #033991 text on black | 1.99:1 | Fails | Lc -9.0 | 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
#F0F6FF
oklch(97.1% 0.014 258.3)
-
Step 100
100
#DEEBFF
oklch(93.6% 0.031 258.9)
-
Step 200
200
#C4DAFF
oklch(88.4% 0.057 260.8)
-
Step 300
300
#9DC2FF
oklch(81% 0.096 260.2)
-
Step 400
400
#679FFF
oklch(70.7% 0.153 260.6)
-
Step 500
500
#3C83FF
oklch(63.2% 0.198 260.7)
-
Step 600
600
#0065F9
oklch(55.6% 0.235 260.6)
-
Step 700
700
#0054D3
oklch(49% 0.208 260.7)
-
Step 800
800
#0044AF
oklch(42.6% 0.181 260.7)
-
Step 900
900 (this color)
#033991
oklch(37.6% 0.155 260.7)
-
Step 950
950
#062355
oklch(27.1% 0.097 260.5)
#033991 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) | #004594 | 0.032 |
| Deuteranopia (no green cones) | #00398F | 0.004 |
| Tritanopia (no blue cones) | #00505F | 0.118 |
| Achromatopsia (no color) | #3F3F3F | 0.155 |
Harmonies
Hue rotations in OKLCH that keep this color's lightness and chroma.
Complementary
The opposite hue (180°).
- #033991
#033991
oklch(37.6% 0.155 260.7)
- #563C00
#563C00
oklch(37.6% 0.078 81.1)
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 #033991, closest first.
Similar named colors
The eight closest entries in our named color list, with their ΔE distance.
- Cobalt #1E488F ΔE 0.047
- Sapphire #2138AB ΔE 0.048
- Twilight Blue #0A437A ΔE 0.050
- Marine Blue #01386A ΔE 0.067
- Royal #0C1793 ΔE 0.067
- Light Navy #155084 ΔE 0.073
- Blueberry #464196 ΔE 0.077
- Dark Slate Blue #483D8B ΔE 0.078
Use #033991 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.