#0666E6
Closest named color: Azul (#1D5DEC). oklch(54.3% 0.21 259.3), rgb(6, 102, 230).
Aa
White text reads best on this color (5.18:1).
About this color
#0666E6 is a medium-dark, vivid blue. In OKLCH its lightness is 54%, its chroma 0.210 and its hue 259°. Its hue sits on the cool side of the wheel. The nearest named color is Azul (#1D5DEC), ΔE 0.023 away. White text reads best on it, at 5.18:1.
| Hue family | Blues |
| Lightness | medium-dark (54%) |
| Chroma | vivid (0.210) |
| Temperature | cool |
| Nearest name | Azul (#1D5DEC) |
| Black text | 4.05:1 |
| White text | 5.18:1 |
Values
| HEX | #0666E6 |
| RGB | rgb(6, 102, 230) |
| HSL | hsl(214, 95%, 46%) |
| OKLCH | oklch(54.3% 0.21 259.3) |
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 #0666E6 | 5.18:1 | AA | Lc -80.2 | Fine for body text |
| Black text on #0666E6 | 4.05:1 | AA large text | Lc 29.3 | Dividers and decoration only |
| #0666E6 text on white | 5.18:1 | AA | Lc 74.8 | Content text, not long reading |
| #0666E6 text on black | 4.05:1 | AA large text | Lc -26.9 | 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
#9CC2FE
oklch(80.9% 0.095 259.4)
-
Step 400
400
#65A0FD
oklch(70.7% 0.15 259.2)
-
Step 500
500
#3884FB
oklch(63% 0.193 259.3)
-
Step 600
600 (this color)
#0666E6
oklch(54.3% 0.21 259.3)
-
Step 700
700
#0058CB
oklch(49.1% 0.193 259.2)
-
Step 800
800
#0648A5
oklch(42.6% 0.162 259.4)
-
Step 900
900
#113E83
oklch(37.7% 0.126 259.3)
-
Step 950
950
#0C254C
oklch(27% 0.079 259.2)
#0666E6 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) | #0077EA | 0.043 |
| Deuteranopia (no green cones) | #0064E4 | 0.006 |
| Tritanopia (no blue cones) | #00869C | 0.158 |
| Achromatopsia (no color) | #6D6D6D | 0.210 |
Harmonies
Hue rotations in OKLCH that keep this color's lightness and chroma.
Complementary
The opposite hue (180°).
- #0666E6
#0666E6
oklch(54.3% 0.21 259.3)
- #926600
#926600
oklch(54.2% 0.113 79)
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 #0666E6, closest first.
Similar named colors
The eight closest entries in our named color list, with their ΔE distance.
- Azul #1D5DEC ΔE 0.023
- Cerulean Blue #056EEE ΔE 0.023
- Bright Blue #0165FC ΔE 0.033
- Royal Blue #4169E1 ΔE 0.037
- Neon Blue #4361EE ΔE 0.038
- Warm Blue #4B57DB ΔE 0.054
- Electric Blue #0652FF ΔE 0.057
- Clear Blue #247AFD ΔE 0.063
Use #0666E6 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.