#333BB0
Closest named color: Sapphire (#2138AB). oklch(42.6% 0.183 272.7), rgb(51, 59, 176).
Aa
White text reads best on this color (8.77:1).
About this color
#333BB0 is a dark, vivid blue. In OKLCH its lightness is 43%, its chroma 0.183 and its hue 273°. Its hue sits on the cool side of the wheel. The nearest named color is Sapphire (#2138AB), ΔE 0.025 away. White text reads best on it, at 8.77:1.
| Hue family | Blues |
| Lightness | dark (43%) |
| Chroma | vivid (0.183) |
| Temperature | cool |
| Nearest name | Sapphire (#2138AB) |
| Black text | 2.39:1 |
| White text | 8.77:1 |
Values
| HEX | #333BB0 |
| RGB | rgb(51, 59, 176) |
| HSL | hsl(236, 55%, 45%) |
| OKLCH | oklch(42.6% 0.183 272.7) |
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 #333BB0 | 8.77:1 | AAA | Lc -93.9 | Preferred for body text |
| Black text on #333BB0 | 2.39:1 | Fails | Lc 14.6 | Not readable |
| #333BB0 text on white | 8.77:1 | AAA | Lc 89.4 | Fine for body text |
| #333BB0 text on black | 2.39:1 | Fails | Lc -12.9 | 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 800.
-
Step 50
50
#F2F5FF
oklch(97.1% 0.014 272.7)
-
Step 100
100
#E3E9FF
oklch(93.6% 0.03 273.6)
-
Step 200
200
#CCD8FF
oklch(88.6% 0.055 271.8)
-
Step 300
300
#ACBDFF
oklch(80.9% 0.095 273)
-
Step 400
400
#8198FF
oklch(70.7% 0.153 272.5)
-
Step 500
500
#6479FF
oklch(63% 0.199 272.7)
-
Step 600
600
#4D58FA
oklch(55.6% 0.237 272.8)
-
Step 700
700
#3F46DA
oklch(49% 0.22 272.8)
-
Step 800
800 (this color)
#333BB0
oklch(42.6% 0.183 272.7)
-
Step 900
900
#2B358B
oklch(37.7% 0.142 272.5)
-
Step 950
950
#192052
oklch(27% 0.091 272.8)
#333BB0 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) | #0051B4 | 0.055 |
| Deuteranopia (no green cones) | #0045AE | 0.039 |
| Tritanopia (no blue cones) | #005A70 | 0.146 |
| Achromatopsia (no color) | #4B4B4B | 0.183 |
Harmonies
Hue rotations in OKLCH that keep this color's lightness and chroma.
Complementary
The opposite hue (180°).
- #333BB0
#333BB0
oklch(42.6% 0.183 272.7)
- #5F4D00
#5F4D00
oklch(42.6% 0.087 93.4)
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 #333BB0, closest first.
No curated palette has a color within ΔE 0.04 of #333BB0.
Similar named colors
The eight closest entries in our named color list, with their ΔE distance.
- Sapphire #2138AB ΔE 0.025
- Blue Blue #2242C7 ΔE 0.042
- Majorelle Blue #3F37C9 ΔE 0.043
- Blueberry #464196 ΔE 0.054
- Indigo Blue #3A18B1 ΔE 0.056
- Blue With A Hint Of Purple #533CC6 ΔE 0.060
- Cobalt #1E488F ΔE 0.066
- Blurple #5539CC ΔE 0.067
Use #333BB0 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.