#0066EB
Closest named color: Cerulean Blue (#056EEE). oklch(54.7% 0.216 259.4), rgb(0, 102, 235).
Aa
White text reads best on this color (5.12:1).
About this color
#0066EB is a medium-dark, vivid blue. In OKLCH its lightness is 55%, its chroma 0.216 and its hue 259°. Its hue sits on the cool side of the wheel. The nearest named color is Cerulean Blue (#056EEE), ΔE 0.020 away. White text reads best on it, at 5.12:1.
| Hue family | Blues |
| Lightness | medium-dark (55%) |
| Chroma | vivid (0.216) |
| Temperature | cool |
| Nearest name | Cerulean Blue (#056EEE) |
| Black text | 4.10:1 |
| White text | 5.12:1 |
Values
| HEX | #0066EB |
| RGB | rgb(0, 102, 235) |
| HSL | hsl(214, 100%, 46%) |
| OKLCH | oklch(54.7% 0.216 259.4) |
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 #0066EB | 5.12:1 | AA | Lc -79.7 | Fine for body text |
| Black text on #0066EB | 4.10:1 | AA large text | Lc 29.7 | Dividers and decoration only |
| #0066EB text on white | 5.12:1 | AA | Lc 74.3 | Content text, not long reading |
| #0066EB text on black | 4.10:1 | AA large text | Lc -27.4 | 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
#C4DBFE
oklch(88.6% 0.054 258.7)
-
Step 300
300
#9CC2FF
oklch(80.9% 0.096 259.7)
-
Step 400
400
#64A0FF
oklch(70.8% 0.153 259.2)
-
Step 500
500
#3584FF
oklch(63.2% 0.199 259.3)
-
Step 600
600 (this color)
#0066EB
oklch(54.7% 0.216 259.4)
-
Step 700
700
#0057CC
oklch(49% 0.195 259.5)
-
Step 800
800
#0248A8
oklch(42.8% 0.167 259.3)
-
Step 900
900
#0F3D85
oklch(37.6% 0.131 259.7)
-
Step 950
950
#0B254E
oklch(27.1% 0.082 259.4)
#0066EB 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) | #0078F0 | 0.045 |
| Deuteranopia (no green cones) | #0064E8 | 0.007 |
| Tritanopia (no blue cones) | #00889F | 0.163 |
| Achromatopsia (no color) | #6E6E6E | 0.216 |
Harmonies
Hue rotations in OKLCH that keep this color's lightness and chroma.
Complementary
The opposite hue (180°).
- #0066EB
#0066EB
oklch(54.7% 0.216 259.4)
- #936700
#936700
oklch(54.6% 0.113 79.2)
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 #0066EB, closest first.
Similar named colors
The eight closest entries in our named color list, with their ΔE distance.
- Cerulean Blue #056EEE ΔE 0.020
- Azul #1D5DEC ΔE 0.021
- Bright Blue #0165FC ΔE 0.026
- Neon Blue #4361EE ΔE 0.037
- Royal Blue #4169E1 ΔE 0.040
- Electric Blue #0652FF ΔE 0.052
- Warm Blue #4B57DB ΔE 0.057
- Clear Blue #247AFD ΔE 0.059
Use #0066EB 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.