#4666F0
Closest named color: Neon Blue (#4361EE). oklch(56.8% 0.21 268.8), rgb(70, 102, 240).
Aa
White text reads best on this color (4.75:1).
About this color
#4666F0 is a medium-dark, vivid blue. In OKLCH its lightness is 57%, its chroma 0.210 and its hue 269°. 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 4.75:1.
| Hue family | Blues |
| Lightness | medium-dark (57%) |
| Chroma | vivid (0.210) |
| Temperature | cool |
| Nearest name | Neon Blue (#4361EE) |
| Black text | 4.41:1 |
| White text | 4.75:1 |
Values
| HEX | #4666F0 |
| RGB | rgb(70, 102, 240) |
| HSL | hsl(229, 85%, 61%) |
| OKLCH | oklch(56.8% 0.21 268.8) |
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 #4666F0 | 4.75:1 | AA | Lc -77.9 | Fine for body text |
| Black text on #4666F0 | 4.41:1 | AA large text | Lc 31.6 | Non-text elements, placeholder text |
| #4666F0 text on white | 4.75:1 | AA | Lc 72.5 | Content text, not long reading |
| #4666F0 text on black | 4.41:1 | AA large text | Lc -29.2 | 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
#E2EAFD
oklch(93.7% 0.027 267.5)
-
Step 200
200
#CBD9FD
oklch(88.6% 0.052 268.5)
-
Step 300
300
#A7BFFF
oklch(81% 0.095 268.4)
-
Step 400
400
#7A9AFE
oklch(70.6% 0.151 268.9)
-
Step 500
500
#5A7DFD
oklch(63.1% 0.194 268.8)
-
Step 600
600 (this color)
#4666F0
oklch(56.8% 0.21 268.8)
-
Step 700
700
#3650CD
oklch(49.1% 0.195 268.9)
-
Step 800
800
#2C42A6
oklch(42.6% 0.163 268.9)
-
Step 900
900
#273A83
oklch(37.8% 0.125 268.7)
-
Step 950
950
#17224D
oklch(26.9% 0.081 269.5)
#4666F0 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) | #007BF5 | 0.055 |
| Deuteranopia (no green cones) | #006BED | 0.039 |
| Tritanopia (no blue cones) | #0088A1 | 0.168 |
| Achromatopsia (no color) | #737373 | 0.210 |
Harmonies
Hue rotations in OKLCH that keep this color's lightness and chroma.
Complementary
The opposite hue (180°).
- #4666F0
#4666F0
oklch(56.8% 0.21 268.8)
- #927200
#927200
oklch(56.7% 0.116 89.1)
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 #4666F0, 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 0.025
- Cerulean Blue #056EEE ΔE 0.038
- Bright Blue #0165FC ΔE 0.043
- Azul #1D5DEC ΔE 0.043
- Warm Blue #4B57DB ΔE 0.046
- Clear Blue #247AFD ΔE 0.051
- Dark Periwinkle #665FD1 ΔE 0.061
Use #4666F0 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.