#333661
Closest named color: Prussian Blue (#1D3557). oklch(35.2% 0.074 278.8), rgb(51, 54, 97).
Aa
White text reads best on this color (11.40:1).
About this color
#333661 is a dark, moderately saturated blue. In OKLCH its lightness is 35%, its chroma 0.074 and its hue 279°. Its hue sits on the cool side of the wheel. The nearest named color is Prussian Blue (#1D3557), ΔE 0.037 away. White text reads best on it, at 11.40:1.
| Hue family | Blues |
| Lightness | dark (35%) |
| Chroma | moderately saturated (0.074) |
| Temperature | cool |
| Nearest name | Prussian Blue (#1D3557) |
| Black text | 1.84:1 |
| White text | 11.40:1 |
Values
| HEX | #333661 |
| RGB | rgb(51, 54, 97) |
| HSL | hsl(236, 31%, 29%) |
| OKLCH | oklch(35.2% 0.074 278.8) |
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 #333661 | 11.40:1 | AAA | Lc -99.9 | Preferred for body text |
| Black text on #333661 | 1.84:1 | Fails | Lc 7.7 | Not readable |
| #333661 text on white | 11.40:1 | AAA | Lc 96.2 | Preferred for body text |
| #333661 text on black | 1.84:1 | 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 900.
-
Step 50
50
#F4F5FB
oklch(97.1% 0.008 278.6)
-
Step 100
100
#E7E9F5
oklch(93.6% 0.016 278.5)
-
Step 200
200
#D4D8EE
oklch(88.6% 0.03 277.6)
-
Step 300
300
#B8BEE5
oklch(81% 0.055 278.2)
-
Step 400
400
#949BD8
oklch(70.7% 0.089 278.8)
-
Step 500
500
#7B81CD
oklch(63% 0.114 279.2)
-
Step 600
600
#646ABA
oklch(55.6% 0.123 278.4)
-
Step 700
700
#5458A0
oklch(49.2% 0.114 278.9)
-
Step 800
800
#444882
oklch(42.7% 0.095 278.6)
-
Step 900
900 (this color)
#333661
oklch(35.2% 0.074 278.8)
-
Step 950
950
#21243D
oklch(27% 0.047 277.6)
#333661 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) | #263C63 | 0.024 |
| Deuteranopia (no green cones) | #233860 | 0.023 |
| Tritanopia (no blue cones) | #243F46 | 0.066 |
| Achromatopsia (no color) | #3A3A3A | 0.074 |
Harmonies
Hue rotations in OKLCH that keep this color's lightness and chroma.
Complementary
The opposite hue (180°).
- #333661
#333661
oklch(35.2% 0.074 278.8)
- #453B00
#453B00
oklch(35.2% 0.073 98.5)
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 #333661, closest first.
Similar named colors
The eight closest entries in our named color list, with their ΔE distance.
- Prussian Blue #1D3557 ΔE 0.037
- Marine Blue #01386A ΔE 0.050
- Dark Blue Grey #1F3B4D ΔE 0.051
- Dark Grey Blue #29465B ΔE 0.054
- Space Cadet #2B2D42 ΔE 0.060
- Gunmetal #293241 ΔE 0.060
- Twilight Blue #0A437A ΔE 0.060
- Marine #042E60 ΔE 0.062
Use #333661 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.