#066AF4
Closest named color: Cerulean Blue (#056EEE). oklch(56.2% 0.222 259.7), rgb(6, 106, 244).
Aa
White text reads best on this color (4.79:1).
About this color
#066AF4 is a medium-dark, vivid blue. In OKLCH its lightness is 56%, its chroma 0.222 and its hue 260°. Its hue sits on the cool side of the wheel. The nearest named color is Cerulean Blue (#056EEE), ΔE 0.013 away. White text reads best on it, at 4.79:1.
| Hue family | Blues |
| Lightness | medium-dark (56%) |
| Chroma | vivid (0.222) |
| Temperature | cool |
| Nearest name | Cerulean Blue (#056EEE) |
| Black text | 4.37:1 |
| White text | 4.79:1 |
Values
| HEX | #066AF4 |
| RGB | rgb(6, 106, 244) |
| HSL | hsl(215, 95%, 49%) |
| OKLCH | oklch(56.2% 0.222 259.7) |
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 #066AF4 | 4.79:1 | AA | Lc -77.8 | Fine for body text |
| Black text on #066AF4 | 4.37:1 | AA large text | Lc 31.7 | Non-text elements, placeholder text |
| #066AF4 text on white | 4.79:1 | AA | Lc 72.4 | Content text, not long reading |
| #066AF4 text on black | 4.37:1 | AA large text | Lc -29.3 | 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
#F0F6FF
oklch(97.1% 0.014 258.3)
-
Step 100
100
#DFEBFE
oklch(93.7% 0.029 259.6)
-
Step 200
200
#C4DBFF
oklch(88.6% 0.056 259.3)
-
Step 300
300
#9CC2FF
oklch(80.9% 0.096 259.7)
-
Step 400
400
#659FFF
oklch(70.6% 0.154 260)
-
Step 500
500
#3783FF
oklch(63% 0.199 259.9)
-
Step 600
600 (this color)
#066AF4
oklch(56.2% 0.222 259.7)
-
Step 700
700
#0057CD
oklch(49.1% 0.196 259.6)
-
Step 800
800
#0047AA
oklch(42.8% 0.171 259.6)
-
Step 900
900
#0E3D87
oklch(37.8% 0.134 259.8)
-
Step 950
950
#0A244F
oklch(26.9% 0.085 260)
#066AF4 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) | #007CF9 | 0.044 |
| Deuteranopia (no green cones) | #0069F1 | 0.006 |
| Tritanopia (no blue cones) | #008DA5 | 0.167 |
| Achromatopsia (no color) | #727272 | 0.223 |
Harmonies
Hue rotations in OKLCH that keep this color's lightness and chroma.
Complementary
The opposite hue (180°).
- #066AF4
#066AF4
oklch(56.2% 0.222 259.7)
- #996C00
#996C00
oklch(56.3% 0.117 79.8)
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 #066AF4, closest first.
Similar named colors
The eight closest entries in our named color list, with their ΔE distance.
- Cerulean Blue #056EEE ΔE 0.013
- Bright Blue #0165FC ΔE 0.017
- Azul #1D5DEC ΔE 0.031
- Neon Blue #4361EE ΔE 0.037
- Royal Blue #4169E1 ΔE 0.042
- Clear Blue #247AFD ΔE 0.045
- Electric Blue #0652FF ΔE 0.054
- Warm Blue #4B57DB ΔE 0.066
Use #066AF4 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.