#333B7A
Closest named color: Twilight Blue (#0A437A). oklch(38.1% 0.106 274.7), rgb(51, 59, 122).
Aa
White text reads best on this color (10.25:1).
About this color
#333B7A is a dark, moderately saturated blue. In OKLCH its lightness is 38%, its chroma 0.106 and its hue 275°. Its hue sits on the cool side of the wheel. The nearest named color is Twilight Blue (#0A437A), ΔE 0.041 away. White text reads best on it, at 10.25:1.
| Hue family | Blues |
| Lightness | dark (38%) |
| Chroma | moderately saturated (0.106) |
| Temperature | cool |
| Nearest name | Twilight Blue (#0A437A) |
| Black text | 2.04:1 |
| White text | 10.25:1 |
Values
| HEX | #333B7A |
| RGB | rgb(51, 59, 122) |
| HSL | hsl(233, 41%, 34%) |
| OKLCH | oklch(38.1% 0.106 274.7) |
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 #333B7A | 10.25:1 | AAA | Lc -97.7 | Preferred for body text |
| Black text on #333B7A | 2.04:1 | Fails | Lc 10.3 | Not readable |
| #333B7A text on white | 10.25:1 | AAA | Lc 93.6 | Preferred for body text |
| #333B7A text on black | 2.04:1 | Fails | Lc -8.9 | 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
#F3F5FD
oklch(97.1% 0.011 274.9)
-
Step 100
100
#E5E9FA
oklch(93.6% 0.023 275.4)
-
Step 200
200
#D0D8F7
oklch(88.6% 0.044 274)
-
Step 300
300
#B1BDF5
oklch(80.9% 0.08 275.1)
-
Step 400
400
#8999F0
oklch(70.7% 0.128 274.7)
-
Step 500
500
#6E7DEA
oklch(63% 0.163 274.8)
-
Step 600
600
#5864D9
oklch(55.7% 0.177 274.7)
-
Step 700
700
#4852BC
oklch(49.1% 0.165 274.5)
-
Step 800
800
#3B4498
oklch(42.8% 0.136 274.5)
-
Step 900
900 (this color)
#333B7A
oklch(38.1% 0.106 274.7)
-
Step 950
950
#1D2247
oklch(26.9% 0.068 275)
#333B7A 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) | #1B447C | 0.034 |
| Deuteranopia (no green cones) | #113E79 | 0.036 |
| Tritanopia (no blue cones) | #0B4954 | 0.094 |
| Achromatopsia (no color) | #414141 | 0.106 |
Harmonies
Hue rotations in OKLCH that keep this color's lightness and chroma.
Complementary
The opposite hue (180°).
- #333B7A
#333B7A
oklch(38.1% 0.106 274.7)
- #504100
#504100
oklch(38% 0.078 94.1)
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 #333B7A, closest first.
Similar named colors
The eight closest entries in our named color list, with their ΔE distance.
- Twilight Blue #0A437A ΔE 0.041
- Dark Slate Blue #483D8B ΔE 0.045
- Cobalt #1E488F ΔE 0.049
- Blueberry #464196 ΔE 0.058
- Marine Blue #01386A ΔE 0.058
- Light Navy #155084 ΔE 0.062
- Dark Grey Blue #29465B ΔE 0.070
- Dusk Blue #26538D ΔE 0.070
Use #333B7A 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.