#333BF1
Closest named color: Light Royal Blue (#3A2EFE). oklch(49.2% 0.261 270), rgb(51, 59, 241).
Aa
White text reads best on this color (6.91:1).
About this color
#333BF1 is a medium-dark, vivid blue. In OKLCH its lightness is 49%, its chroma 0.261 and its hue 270°. Its hue sits on the cool side of the wheel. The nearest named color is Light Royal Blue (#3A2EFE), ΔE 0.024 away. White text reads best on it, at 6.91:1.
| Hue family | Blues |
| Lightness | medium-dark (49%) |
| Chroma | vivid (0.261) |
| Temperature | cool |
| Nearest name | Light Royal Blue (#3A2EFE) |
| Black text | 3.03:1 |
| White text | 6.91:1 |
Values
| HEX | #333BF1 |
| RGB | rgb(51, 59, 241) |
| HSL | hsl(237, 87%, 57%) |
| OKLCH | oklch(49.2% 0.261 270) |
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 #333BF1 | 6.91:1 | AA | Lc -87.7 | Fine for body text |
| Black text on #333BF1 | 3.03:1 | AA large text | Lc 21.4 | Dividers and decoration only |
| #333BF1 text on white | 6.91:1 | AA | Lc 82.6 | Fine for body text |
| #333BF1 text on black | 3.03:1 | AA large text | Lc -19.3 | Dividers and decoration only |
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 700.
-
Step 50
50
#F2F5FF
oklch(97.1% 0.014 272.7)
-
Step 100
100
#E2E9FF
oklch(93.5% 0.031 271.7)
-
Step 200
200
#CBD8FF
oklch(88.5% 0.056 270.7)
-
Step 300
300
#A8BEFF
oklch(80.9% 0.096 269.8)
-
Step 400
400
#7C99FF
oklch(70.6% 0.153 270.2)
-
Step 500
500
#5D7CFF
oklch(63.2% 0.197 269.9)
-
Step 600
600
#4259FF
oklch(55.6% 0.245 269.9)
-
Step 700
700 (this color)
#333BF1
oklch(49.2% 0.261 270)
-
Step 800
800
#2933C2
oklch(42.6% 0.216 270)
-
Step 900
900
#233199
oklch(37.8% 0.168 269.9)
-
Step 950
950
#141E59
oklch(26.9% 0.106 270.2)
#333BF1 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) | #0063F6 | 0.076 |
| Deuteranopia (no green cones) | #0050EE | 0.040 |
| Tritanopia (no blue cones) | #007294 | 0.201 |
| Achromatopsia (no color) | #5A5A5A | 0.262 |
Harmonies
Hue rotations in OKLCH that keep this color's lightness and chroma.
Complementary
The opposite hue (180°).
- #333BF1
#333BF1
oklch(49.2% 0.261 270)
- #775D00
#775D00
oklch(49.1% 0.1 89.6)
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 #333BF1, closest first.
No curated palette has a color within ΔE 0.04 of #333BF1.
Similar named colors
The eight closest entries in our named color list, with their ΔE distance.
- Light Royal Blue #3A2EFE ΔE 0.024
- Vibrant Blue #0339F8 ΔE 0.033
- Vivid Blue #152EFF ΔE 0.039
- Electric Blue #0652FF ΔE 0.049
- Rich Blue #021BF9 ΔE 0.059
- Azul #1D5DEC ΔE 0.063
- Purpley Blue #5F34E7 ΔE 0.065
- Majorelle Blue #3F37C9 ΔE 0.065
Use #333BF1 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.