#066AE9
Closest named color: Cerulean Blue (#056EEE). oklch(55.3% 0.209 258.8), rgb(6, 106, 233).
Aa
White text reads best on this color (4.94:1).
About this color
#066AE9 is a medium-dark, vivid blue. In OKLCH its lightness is 55%, its chroma 0.209 and its hue 259°. Its hue sits on the cool side of the wheel. The nearest named color is Cerulean Blue (#056EEE), ΔE 0.012 away. White text reads best on it, at 4.94:1.
| Hue family | Blues |
| Lightness | medium-dark (55%) |
| Chroma | vivid (0.209) |
| Temperature | cool |
| Nearest name | Cerulean Blue (#056EEE) |
| Black text | 4.24:1 |
| White text | 4.94:1 |
Values
| HEX | #066AE9 |
| RGB | rgb(6, 106, 233) |
| HSL | hsl(214, 95%, 47%) |
| OKLCH | oklch(55.3% 0.209 258.8) |
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 #066AE9 | 4.94:1 | AA | Lc -78.8 | Fine for body text |
| Black text on #066AE9 | 4.24:1 | AA large text | Lc 30.7 | Non-text elements, placeholder text |
| #066AE9 text on white | 4.94:1 | AA | Lc 73.4 | Content text, not long reading |
| #066AE9 text on black | 4.24:1 | 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
#F0F6FE
oklch(97.1% 0.012 255.5)
-
Step 100
100
#DFEBFD
oklch(93.6% 0.028 258.4)
-
Step 200
200
#C5DBFC
oklch(88.6% 0.051 258.4)
-
Step 300
300
#9CC2FD
oklch(80.8% 0.094 259)
-
Step 400
400
#64A0FD
oklch(70.7% 0.151 258.9)
-
Step 500
500
#3785FB
oklch(63.1% 0.192 258.8)
-
Step 600
600 (this color)
#066AE9
oklch(55.3% 0.209 258.8)
-
Step 700
700
#0059C8
oklch(49.1% 0.188 258.7)
-
Step 800
800
#0349A4
oklch(42.7% 0.16 258.6)
-
Step 900
900
#103E82
oklch(37.6% 0.125 258.9)
-
Step 950
950
#0B254C
oklch(27% 0.079 258.6)
#066AE9 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) | #007AED | 0.040 |
| Deuteranopia (no green cones) | #0067E7 | 0.008 |
| Tritanopia (no blue cones) | #008A9F | 0.158 |
| Achromatopsia (no color) | #707070 | 0.209 |
Harmonies
Hue rotations in OKLCH that keep this color's lightness and chroma.
Complementary
The opposite hue (180°).
- #066AE9
#066AE9
oklch(55.3% 0.209 258.8)
- #966900
#966900
oklch(55.3% 0.115 79.1)
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 #066AE9, closest first.
Similar named colors
The eight closest entries in our named color list, with their ΔE distance.
- Cerulean Blue #056EEE ΔE 0.012
- Azul #1D5DEC ΔE 0.030
- Bright Blue #0165FC ΔE 0.031
- Royal Blue #4169E1 ΔE 0.034
- Neon Blue #4361EE ΔE 0.038
- Clear Blue #247AFD ΔE 0.052
- Warm Blue #4B57DB ΔE 0.059
- Electric Blue #0652FF ΔE 0.062
Use #066AE9 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.