#3B66EB
Closest named color: Neon Blue (#4361EE). oklch(55.9% 0.207 266.1), rgb(59, 102, 235).
Aa
White text reads best on this color (4.89:1).
About this color
#3B66EB is a medium-dark, vivid blue. In OKLCH its lightness is 56%, its chroma 0.207 and its hue 266°. Its hue sits on the cool side of the wheel. The nearest named color is Neon Blue (#4361EE), ΔE 0.013 away. White text reads best on it, at 4.89:1.
| Hue family | Blues |
| Lightness | medium-dark (56%) |
| Chroma | vivid (0.207) |
| Temperature | cool |
| Nearest name | Neon Blue (#4361EE) |
| Black text | 4.28:1 |
| White text | 4.89:1 |
Values
| HEX | #3B66EB |
| RGB | rgb(59, 102, 235) |
| HSL | hsl(225, 81%, 58%) |
| OKLCH | oklch(55.9% 0.207 266.1) |
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 #3B66EB | 4.89:1 | AA | Lc -78.8 | Fine for body text |
| Black text on #3B66EB | 4.28:1 | AA large text | Lc 30.7 | Non-text elements, placeholder text |
| #3B66EB text on white | 4.89:1 | AA | Lc 73.4 | Content text, not long reading |
| #3B66EB text on black | 4.28:1 | AA large text | Lc -28.3 | 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 600.
-
Step 50
50
#F1F5FE
oklch(97% 0.013 266.7)
-
Step 100
100
#E1EAFD
oklch(93.6% 0.028 265.4)
-
Step 200
200
#C9D9FC
oklch(88.5% 0.051 265.9)
-
Step 300
300
#A5C0FE
oklch(81% 0.093 266.2)
-
Step 400
400
#759CFD
oklch(70.7% 0.149 266.1)
-
Step 500
500
#5380FB
oklch(63.2% 0.19 266)
-
Step 600
600 (this color)
#3B66EB
oklch(55.9% 0.207 266.1)
-
Step 700
700
#2D53CB
oklch(49.1% 0.191 266)
-
Step 800
800
#2645A4
oklch(42.8% 0.158 266.1)
-
Step 900
900
#223B82
oklch(37.6% 0.124 266)
-
Step 950
950
#14234C
oklch(26.9% 0.078 266.1)
#3B66EB 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) | #0079F0 | 0.048 |
| Deuteranopia (no green cones) | #0069E8 | 0.029 |
| Tritanopia (no blue cones) | #00879F | 0.162 |
| Achromatopsia (no color) | #717171 | 0.207 |
Harmonies
Hue rotations in OKLCH that keep this color's lightness and chroma.
Complementary
The opposite hue (180°).
- #3B66EB
#3B66EB
oklch(55.9% 0.207 266.1)
- #926E00
#926E00
oklch(55.9% 0.114 85.8)
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 #3B66EB, closest first.
Similar named colors
The eight closest entries in our named color list, with their ΔE distance.
- Neon Blue #4361EE ΔE 0.013
- Royal Blue #4169E1 ΔE 0.018
- Cerulean Blue #056EEE ΔE 0.029
- Azul #1D5DEC ΔE 0.034
- Bright Blue #0165FC ΔE 0.038
- Warm Blue #4B57DB ΔE 0.042
- Clear Blue #247AFD ΔE 0.053
- Dark Periwinkle #665FD1 ΔE 0.064
Use #3B66EB 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.