#3D66E9
Closest named color: Neon Blue (#4361EE). oklch(55.8% 0.203 266.5), rgb(61, 102, 233).
Aa
White text reads best on this color (4.91:1).
About this color
#3D66E9 is a medium-dark, vivid blue. In OKLCH its lightness is 56%, its chroma 0.203 and its hue 267°. Its hue sits on the cool side of the wheel. The nearest named color is Neon Blue (#4361EE), ΔE 0.014 away. White text reads best on it, at 4.91:1.
| Hue family | Blues |
| Lightness | medium-dark (56%) |
| Chroma | vivid (0.203) |
| Temperature | cool |
| Nearest name | Neon Blue (#4361EE) |
| Black text | 4.27:1 |
| White text | 4.91:1 |
Values
| HEX | #3D66E9 |
| RGB | rgb(61, 102, 233) |
| HSL | hsl(226, 80%, 58%) |
| OKLCH | oklch(55.8% 0.203 266.5) |
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 #3D66E9 | 4.91:1 | AA | Lc -78.9 | Fine for body text |
| Black text on #3D66E9 | 4.27:1 | AA large text | Lc 30.6 | Non-text elements, placeholder text |
| #3D66E9 text on white | 4.91:1 | AA | Lc 73.5 | Content text, not long reading |
| #3D66E9 text on black | 4.27:1 | AA large text | Lc -28.2 | 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
#F2F5FE
oklch(97% 0.012 271.3)
-
Step 100
100
#E2EAFC
oklch(93.6% 0.026 266.6)
-
Step 200
200
#CAD9FC
oklch(88.5% 0.051 267)
-
Step 300
300
#A5C0FD
oklch(81% 0.092 265.9)
-
Step 400
400
#769CFC
oklch(70.7% 0.147 266.4)
-
Step 500
500
#5580F9
oklch(63.2% 0.187 266.4)
-
Step 600
600 (this color)
#3D66E9
oklch(55.8% 0.203 266.5)
-
Step 700
700
#2F53CA
oklch(49.1% 0.189 266.4)
-
Step 800
800
#2745A3
oklch(42.7% 0.156 266.3)
-
Step 900
900
#243B81
oklch(37.7% 0.122 266.8)
-
Step 950
950
#15234C
oklch(27% 0.078 266.9)
#3D66E9 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) | #0079ED | 0.049 |
| Deuteranopia (no green cones) | #0069E6 | 0.031 |
| Tritanopia (no blue cones) | #00869E | 0.160 |
| Achromatopsia (no color) | #717171 | 0.204 |
Harmonies
Hue rotations in OKLCH that keep this color's lightness and chroma.
Complementary
The opposite hue (180°).
- #3D66E9
#3D66E9
oklch(55.8% 0.203 266.5)
- #916E00
#916E00
oklch(55.8% 0.114 86.4)
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 #3D66E9, closest first.
Similar named colors
The eight closest entries in our named color list, with their ΔE distance.
- Neon Blue #4361EE ΔE 0.014
- Royal Blue #4169E1 ΔE 0.015
- Cerulean Blue #056EEE ΔE 0.031
- Azul #1D5DEC ΔE 0.035
- Warm Blue #4B57DB ΔE 0.040
- Bright Blue #0165FC ΔE 0.041
- Clear Blue #247AFD ΔE 0.054
- Dark Periwinkle #665FD1 ΔE 0.061
Use #3D66E9 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.