#4E66E7
Closest named color: Royal Blue (#4169E1). oklch(56.5% 0.196 270.8), rgb(78, 102, 231).
Aa
White text reads best on this color (4.79:1).
About this color
#4E66E7 is a medium-dark, vivid blue. In OKLCH its lightness is 57%, its chroma 0.196 and its hue 271°. Its hue sits on the cool side of the wheel. The nearest named color is Royal Blue (#4169E1), ΔE 0.018 away. White text reads best on it, at 4.79:1.
| Hue family | Blues |
| Lightness | medium-dark (57%) |
| Chroma | vivid (0.196) |
| Temperature | cool |
| Nearest name | Royal Blue (#4169E1) |
| Black text | 4.37:1 |
| White text | 4.79:1 |
Values
| HEX | #4E66E7 |
| RGB | rgb(78, 102, 231) |
| HSL | hsl(231, 76%, 61%) |
| OKLCH | oklch(56.5% 0.196 270.8) |
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 #4E66E7 | 4.79:1 | AA | Lc -78.3 | Fine for body text |
| Black text on #4E66E7 | 4.37:1 | AA large text | Lc 31.2 | Non-text elements, placeholder text |
| #4E66E7 text on white | 4.79:1 | AA | Lc 72.8 | Content text, not long reading |
| #4E66E7 text on black | 4.37:1 | AA large text | Lc -28.8 | 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
#E3E9FC
oklch(93.5% 0.027 271.9)
-
Step 200
200
#CDD8FB
oklch(88.5% 0.05 271.6)
-
Step 300
300
#ABBEFA
oklch(80.9% 0.088 270.8)
-
Step 400
400
#809AF8
oklch(70.7% 0.141 270.8)
-
Step 500
500
#627DF5
oklch(63% 0.181 270.9)
-
Step 600
600 (this color)
#4E66E7
oklch(56.5% 0.196 270.8)
-
Step 700
700
#3D51C6
oklch(49.1% 0.183 270.7)
-
Step 800
800
#3243A0
oklch(42.6% 0.151 270.7)
-
Step 900
900
#2B3A7F
oklch(37.7% 0.118 270.6)
-
Step 950
950
#19234A
oklch(27.1% 0.073 270.1)
#4E66E7 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) | #0079EB | 0.057 |
| Deuteranopia (no green cones) | #006CE4 | 0.048 |
| Tritanopia (no blue cones) | #00859D | 0.160 |
| Achromatopsia (no color) | #727272 | 0.197 |
Harmonies
Hue rotations in OKLCH that keep this color's lightness and chroma.
Complementary
The opposite hue (180°).
- #4E66E7
#4E66E7
oklch(56.5% 0.196 270.8)
- #907200
#907200
oklch(56.5% 0.116 90.3)
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 #4E66E7, closest first.
Similar named colors
The eight closest entries in our named color list, with their ΔE distance.
- Royal Blue #4169E1 ΔE 0.018
- Neon Blue #4361EE ΔE 0.021
- Warm Blue #4B57DB ΔE 0.040
- Dark Periwinkle #665FD1 ΔE 0.046
- Cerulean Blue #056EEE ΔE 0.046
- Azul #1D5DEC ΔE 0.051
- Bright Blue #0165FC ΔE 0.057
- Slate Blue #6A5ACD ΔE 0.057
Use #4E66E7 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.