#4D66E1
Closest named color: Royal Blue (#4169E1). oklch(56% 0.188 270.5), rgb(77, 102, 225).
Aa
White text reads best on this color (4.87:1).
About this color
#4D66E1 is a medium-dark, vivid blue. In OKLCH its lightness is 56%, its chroma 0.188 and its hue 270°. Its hue sits on the cool side of the wheel. The nearest named color is Royal Blue (#4169E1), ΔE 0.013 away. White text reads best on it, at 4.87:1.
| Hue family | Blues |
| Lightness | medium-dark (56%) |
| Chroma | vivid (0.188) |
| Temperature | cool |
| Nearest name | Royal Blue (#4169E1) |
| Black text | 4.30:1 |
| White text | 4.87:1 |
Values
| HEX | #4D66E1 |
| RGB | rgb(77, 102, 225) |
| HSL | hsl(230, 71%, 59%) |
| OKLCH | oklch(56% 0.188 270.5) |
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 #4D66E1 | 4.87:1 | AA | Lc -78.8 | Fine for body text |
| Black text on #4D66E1 | 4.30:1 | AA large text | Lc 30.7 | Non-text elements, placeholder text |
| #4D66E1 text on white | 4.87:1 | AA | Lc 73.4 | Content text, not long reading |
| #4D66E1 text on black | 4.30:1 | 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
#F2F5FD
oklch(97% 0.011 269.6)
-
Step 100
100
#E3E9FB
oklch(93.5% 0.025 271.1)
-
Step 200
200
#CDD8F9
oklch(88.4% 0.047 270.8)
-
Step 300
300
#ACBEF8
oklch(80.8% 0.085 271.1)
-
Step 400
400
#819BF5
oklch(70.8% 0.135 270.5)
-
Step 500
500
#637FF1
oklch(63.2% 0.173 270.4)
-
Step 600
600 (this color)
#4D66E1
oklch(56% 0.188 270.5)
-
Step 700
700
#3E53C2
oklch(49.2% 0.174 270.5)
-
Step 800
800
#33449D
oklch(42.6% 0.146 270.8)
-
Step 900
900
#2C3B7D
oklch(37.8% 0.113 270.5)
-
Step 950
950
#192349
oklch(27% 0.072 270)
#4D66E1 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) | #0078E5 | 0.056 |
| Deuteranopia (no green cones) | #006BDF | 0.047 |
| Tritanopia (no blue cones) | #00849A | 0.156 |
| Achromatopsia (no color) | #717171 | 0.189 |
Harmonies
Hue rotations in OKLCH that keep this color's lightness and chroma.
Complementary
The opposite hue (180°).
- #4D66E1
#4D66E1
oklch(56% 0.188 270.5)
- #8E7100
#8E7100
oklch(56.1% 0.115 90.8)
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 #4D66E1, closest first.
Similar named colors
The eight closest entries in our named color list, with their ΔE distance.
- Royal Blue #4169E1 ΔE 0.013
- Neon Blue #4361EE ΔE 0.026
- Warm Blue #4B57DB ΔE 0.036
- Dark Periwinkle #665FD1 ΔE 0.041
- Cerulean Blue #056EEE ΔE 0.048
- Azul #1D5DEC ΔE 0.052
- Slate Blue #6A5ACD ΔE 0.053
- Light Indigo #6D5ACF ΔE 0.054
Use #4D66E1 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.