#333F86
Closest named color: Cobalt (#1E488F). oklch(39.8% 0.119 272.6), rgb(51, 63, 134).
Aa
White text reads best on this color (9.56:1).
About this color
#333F86 is a dark, moderately saturated blue. In OKLCH its lightness is 40%, its chroma 0.119 and its hue 273°. Its hue sits on the cool side of the wheel. The nearest named color is Cobalt (#1E488F), ΔE 0.032 away. White text reads best on it, at 9.56:1.
| Hue family | Blues |
| Lightness | dark (40%) |
| Chroma | moderately saturated (0.119) |
| Temperature | cool |
| Nearest name | Cobalt (#1E488F) |
| Black text | 2.19:1 |
| White text | 9.56:1 |
Values
| HEX | #333F86 |
| RGB | rgb(51, 63, 134) |
| HSL | hsl(231, 45%, 36%) |
| OKLCH | oklch(39.8% 0.119 272.6) |
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 #333F86 | 9.56:1 | AAA | Lc -96.1 | Preferred for body text |
| Black text on #333F86 | 2.19:1 | Fails | Lc 12.1 | Not readable |
| #333F86 text on white | 9.56:1 | AAA | Lc 91.9 | Preferred for body text |
| #333F86 text on black | 2.19:1 | Fails | Lc -10.5 | 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
#F3F5FE
oklch(97.1% 0.012 276.1)
-
Step 100
100
#E4E9FC
oklch(93.6% 0.026 274.1)
-
Step 200
200
#CED8FB
oklch(88.6% 0.049 272.8)
-
Step 300
300
#ADBDFB
oklch(80.8% 0.09 273.1)
-
Step 400
400
#8399F9
oklch(70.7% 0.143 272.5)
-
Step 500
500
#677CF6
oklch(63.2% 0.182 272.8)
-
Step 600
600
#5061E5
oklch(55.5% 0.199 272.6)
-
Step 700
700
#424FC7
oklch(49.1% 0.185 272.8)
-
Step 800
800
#3642A1
oklch(42.8% 0.153 272.7)
-
Step 900
900 (this color)
#333F86
oklch(39.8% 0.119 272.6)
-
Step 950
950
#1B224B
oklch(27% 0.076 273)
#333F86 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) | #174989 | 0.035 |
| Deuteranopia (no green cones) | #024285 | 0.040 |
| Tritanopia (no blue cones) | #004F5C | 0.102 |
| Achromatopsia (no color) | #454545 | 0.119 |
Harmonies
Hue rotations in OKLCH that keep this color's lightness and chroma.
Complementary
The opposite hue (180°).
- #333F86
#333F86
oklch(39.8% 0.119 272.6)
- #574500
#574500
oklch(39.8% 0.081 91.8)
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 #333F86, closest first.
Similar named colors
The eight closest entries in our named color list, with their ΔE distance.
- Cobalt #1E488F ΔE 0.032
- Dark Slate Blue #483D8B ΔE 0.033
- Blueberry #464196 ΔE 0.040
- Twilight Blue #0A437A ΔE 0.044
- Light Navy #155084 ΔE 0.053
- Dusk Blue #26538D ΔE 0.055
- Deep Sea Blue #015482 ΔE 0.067
- Sapphire #2138AB ΔE 0.067
Use #333F86 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.