#033B8F
Closest named color: Cobalt (#1E488F). oklch(37.8% 0.149 259.9), rgb(3, 59, 143).
Aa
White text reads best on this color (10.36:1).
About this color
#033B8F is a dark, vivid blue. In OKLCH its lightness is 38%, its chroma 0.149 and its hue 260°. Its hue sits on the cool side of the wheel. The nearest named color is Cobalt (#1E488F), ΔE 0.042 away. White text reads best on it, at 10.36:1.
| Hue family | Blues |
| Lightness | dark (38%) |
| Chroma | vivid (0.149) |
| Temperature | cool |
| Nearest name | Cobalt (#1E488F) |
| Black text | 2.02:1 |
| White text | 10.36:1 |
Values
| HEX | #033B8F |
| RGB | rgb(3, 59, 143) |
| HSL | hsl(216, 96%, 29%) |
| OKLCH | oklch(37.8% 0.149 259.9) |
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 #033B8F | 10.36:1 | AAA | Lc -97.4 | Preferred for body text |
| Black text on #033B8F | 2.02:1 | Fails | Lc 10.7 | Not readable |
| #033B8F text on white | 10.36:1 | AAA | Lc 93.3 | Preferred for body text |
| #033B8F text on black | 2.02:1 | Fails | Lc -9.2 | 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
#C4DBFF
oklch(88.6% 0.056 259.3)
-
Step 300
300
#9CC2FF
oklch(80.9% 0.096 259.7)
-
Step 400
400
#659FFF
oklch(70.6% 0.154 260)
-
Step 500
500
#3883FF
oklch(63% 0.199 260)
-
Step 600
600
#0067F4
oklch(55.6% 0.226 260)
-
Step 700
700
#0056CF
oklch(49.1% 0.2 260)
-
Step 800
800
#0046AB
oklch(42.6% 0.173 259.9)
-
Step 900
900 (this color)
#033B8F
oklch(37.8% 0.149 259.9)
-
Step 950
950
#062353
oklch(26.9% 0.094 260)
#033B8F 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) | #004692 | 0.030 |
| Deuteranopia (no green cones) | #003A8D | 0.005 |
| Tritanopia (no blue cones) | #00505F | 0.112 |
| Achromatopsia (no color) | #404040 | 0.149 |
Harmonies
Hue rotations in OKLCH that keep this color's lightness and chroma.
Complementary
The opposite hue (180°).
- #033B8F
#033B8F
oklch(37.8% 0.149 259.9)
- #573C00
#573C00
oklch(37.7% 0.078 80.1)
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 #033B8F, closest first.
Similar named colors
The eight closest entries in our named color list, with their ΔE distance.
- Cobalt #1E488F ΔE 0.042
- Twilight Blue #0A437A ΔE 0.044
- Sapphire #2138AB ΔE 0.051
- Marine Blue #01386A ΔE 0.064
- Light Navy #155084 ΔE 0.067
- Royal #0C1793 ΔE 0.073
- Blueberry #464196 ΔE 0.075
- Dark Slate Blue #483D8B ΔE 0.076
Use #033B8F 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.