#333F85
Closest named color: Cobalt (#1E488F). oklch(39.7% 0.117 272.6), rgb(51, 63, 133).
Aa
White text reads best on this color (9.58:1).
About this color
#333F85 is a dark, moderately saturated blue. In OKLCH its lightness is 40%, its chroma 0.117 and its hue 273°. Its hue sits on the cool side of the wheel. The nearest named color is Cobalt (#1E488F), ΔE 0.033 away. White text reads best on it, at 9.58:1.
| Hue family | Blues |
| Lightness | dark (40%) |
| Chroma | moderately saturated (0.117) |
| Temperature | cool |
| Nearest name | Cobalt (#1E488F) |
| Black text | 2.19:1 |
| White text | 9.58:1 |
Values
| HEX | #333F85 |
| RGB | rgb(51, 63, 133) |
| HSL | hsl(231, 45%, 36%) |
| OKLCH | oklch(39.7% 0.117 272.6) |
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 #333F85 | 9.58:1 | AAA | Lc -96.2 | Preferred for body text |
| Black text on #333F85 | 2.19:1 | Fails | Lc 12.0 | Not readable |
| #333F85 text on white | 9.58:1 | AAA | Lc 91.9 | Preferred for body text |
| #333F85 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
#CED8FA
oklch(88.5% 0.048 272.4)
-
Step 300
300
#ADBDFA
oklch(80.8% 0.088 272.9)
-
Step 400
400
#8399F8
oklch(70.7% 0.141 272.5)
-
Step 500
500
#677CF4
oklch(63% 0.18 272.7)
-
Step 600
600
#5162E3
oklch(55.6% 0.195 272.7)
-
Step 700
700
#4250C5
oklch(49.1% 0.181 272.6)
-
Step 800
800
#3642A0
oklch(42.7% 0.152 272.7)
-
Step 900
900 (this color)
#333F85
oklch(39.7% 0.117 272.6)
-
Step 950
950
#1B224A
oklch(27% 0.074 273)
#333F85 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) | #184987 | 0.035 |
| Deuteranopia (no green cones) | #054284 | 0.039 |
| Tritanopia (no blue cones) | #004F5B | 0.103 |
| Achromatopsia (no color) | #454545 | 0.117 |
Harmonies
Hue rotations in OKLCH that keep this color's lightness and chroma.
Complementary
The opposite hue (180°).
- #333F85
#333F85
oklch(39.7% 0.117 272.6)
- #564500
#564500
oklch(39.7% 0.081 92.8)
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 #333F85, closest first.
Similar named colors
The eight closest entries in our named color list, with their ΔE distance.
- Cobalt #1E488F ΔE 0.033
- Dark Slate Blue #483D8B ΔE 0.034
- Blueberry #464196 ΔE 0.041
- Twilight Blue #0A437A ΔE 0.043
- Light Navy #155084 ΔE 0.052
- Dusk Blue #26538D ΔE 0.056
- Deep Sea Blue #015482 ΔE 0.066
- Twilight #4E518B ΔE 0.068
Use #333F85 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.