#3366E1
Closest named color: Royal Blue (#4169E1). oklch(54.8% 0.196 264), rgb(51, 102, 225).
Aa
White text reads best on this color (5.08:1).
About this color
#3366E1 is a medium-dark, vivid blue. In OKLCH its lightness is 55%, its chroma 0.196 and its hue 264°. Its hue sits on the cool side of the wheel. The nearest named color is Royal Blue (#4169E1), ΔE 0.016 away. White text reads best on it, at 5.08:1.
| Hue family | Blues |
| Lightness | medium-dark (55%) |
| Chroma | vivid (0.196) |
| Temperature | cool |
| Nearest name | Royal Blue (#4169E1) |
| Black text | 4.12:1 |
| White text | 5.08:1 |
Values
| HEX | #3366E1 |
| RGB | rgb(51, 102, 225) |
| HSL | hsl(222, 74%, 54%) |
| OKLCH | oklch(54.8% 0.196 264) |
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 #3366E1 | 5.08:1 | AA | Lc -79.9 | Fine for body text |
| Black text on #3366E1 | 4.12:1 | AA large text | Lc 29.5 | Dividers and decoration only |
| #3366E1 text on white | 5.08:1 | AA | Lc 74.6 | Content text, not long reading |
| #3366E1 text on black | 4.12:1 | AA large text | Lc -27.2 | 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
#C9DAFA
oklch(88.6% 0.048 263.1)
-
Step 300
300
#A4C1FA
oklch(81% 0.087 263.6)
-
Step 400
400
#739EF8
oklch(70.7% 0.141 263.8)
-
Step 500
500
#5082F5
oklch(63.1% 0.181 264.2)
-
Step 600
600 (this color)
#3366E1
oklch(54.8% 0.196 264)
-
Step 700
700
#2856C6
oklch(49.1% 0.182 264)
-
Step 800
800
#2247A0
oklch(42.7% 0.151 264)
-
Step 900
900
#203D7F
oklch(37.7% 0.117 263.8)
-
Step 950
950
#13244A
oklch(26.9% 0.074 264)
#3366E1 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) | #0077E5 | 0.043 |
| Deuteranopia (no green cones) | #0067DF | 0.023 |
| Tritanopia (no blue cones) | #008499 | 0.153 |
| Achromatopsia (no color) | #6E6E6E | 0.196 |
Harmonies
Hue rotations in OKLCH that keep this color's lightness and chroma.
Complementary
The opposite hue (180°).
- #3366E1
#3366E1
oklch(54.8% 0.196 264)
- #906A00
#906A00
oklch(54.8% 0.113 83.7)
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 #3366E1, closest first.
Similar named colors
The eight closest entries in our named color list, with their ΔE distance.
- Royal Blue #4169E1 ΔE 0.016
- Neon Blue #4361EE ΔE 0.027
- Cerulean Blue #056EEE ΔE 0.030
- Azul #1D5DEC ΔE 0.033
- Warm Blue #4B57DB ΔE 0.039
- Bright Blue #0165FC ΔE 0.046
- Clear Blue #247AFD ΔE 0.062
- Dark Periwinkle #665FD1 ΔE 0.063
Use #3366E1 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.