#3366E5
Closest named color: Royal Blue (#4169E1). oklch(55.1% 0.201 264.2), rgb(51, 102, 229).
Aa
White text reads best on this color (5.03:1).
About this color
#3366E5 is a medium-dark, vivid blue. In OKLCH its lightness is 55%, its chroma 0.201 and its hue 264°. Its hue sits on the cool side of the wheel. The nearest named color is Royal Blue (#4169E1), ΔE 0.017 away. White text reads best on it, at 5.03:1.
| Hue family | Blues |
| Lightness | medium-dark (55%) |
| Chroma | vivid (0.201) |
| Temperature | cool |
| Nearest name | Royal Blue (#4169E1) |
| Black text | 4.17:1 |
| White text | 5.03:1 |
Values
| HEX | #3366E5 |
| RGB | rgb(51, 102, 229) |
| HSL | hsl(223, 77%, 55%) |
| OKLCH | oklch(55.1% 0.201 264.2) |
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 #3366E5 | 5.03:1 | AA | Lc -79.6 | Fine for body text |
| Black text on #3366E5 | 4.17:1 | AA large text | Lc 29.9 | Dividers and decoration only |
| #3366E5 text on white | 5.03:1 | AA | Lc 74.2 | Content text, not long reading |
| #3366E5 text on black | 4.17:1 | AA large text | Lc -27.5 | 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 600.
-
Step 50
50
#F1F6FE
oklch(97.2% 0.012 259.8)
-
Step 100
100
#E1EAFC
oklch(93.6% 0.026 264.4)
-
Step 200
200
#C9DAFB
oklch(88.6% 0.049 263.7)
-
Step 300
300
#A3C0FC
oklch(80.8% 0.091 264.4)
-
Step 400
400
#729DFA
oklch(70.6% 0.145 264.3)
-
Step 500
500
#4F82F8
oklch(63.2% 0.185 264.2)
-
Step 600
600 (this color)
#3366E5
oklch(55.1% 0.201 264.2)
-
Step 700
700
#2855C8
oklch(49.1% 0.186 264.3)
-
Step 800
800
#2146A2
oklch(42.6% 0.155 264.2)
-
Step 900
900
#203C81
oklch(37.7% 0.121 264.6)
-
Step 950
950
#13244B
oklch(27% 0.076 264.2)
#3366E5 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) | #0077E9 | 0.042 |
| Deuteranopia (no green cones) | #0067E3 | 0.023 |
| Tritanopia (no blue cones) | #00869C | 0.157 |
| Achromatopsia (no color) | #6F6F6F | 0.201 |
Harmonies
Hue rotations in OKLCH that keep this color's lightness and chroma.
Complementary
The opposite hue (180°).
- #3366E5
#3366E5
oklch(55.1% 0.201 264.2)
- #916B00
#916B00
oklch(55.1% 0.113 83.9)
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 #3366E5, closest first.
Similar named colors
The eight closest entries in our named color list, with their ΔE distance.
- Royal Blue #4169E1 ΔE 0.017
- Neon Blue #4361EE ΔE 0.022
- Cerulean Blue #056EEE ΔE 0.027
- Azul #1D5DEC ΔE 0.030
- Bright Blue #0165FC ΔE 0.040
- Warm Blue #4B57DB ΔE 0.040
- Clear Blue #247AFD ΔE 0.058
- Dark Periwinkle #665FD1 ΔE 0.065
Use #3366E5 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.