#0663CC
Closest named color: Mid Blue (#276AB3). oklch(51.6% 0.18 257.1), rgb(6, 99, 204).
Aa
White text reads best on this color (5.73:1).
About this color
#0663CC is a medium-dark, vivid blue. In OKLCH its lightness is 52%, its chroma 0.180 and its hue 257°. Its hue sits on the cool side of the wheel. The nearest named color is Mid Blue (#276AB3), ΔE 0.048 away. White text reads best on it, at 5.73:1.
| Hue family | Blues |
| Lightness | medium-dark (52%) |
| Chroma | vivid (0.180) |
| Temperature | cool |
| Nearest name | Mid Blue (#276AB3) |
| Black text | 3.66:1 |
| White text | 5.73:1 |
Values
| HEX | #0663CC |
| RGB | rgb(6, 99, 204) |
| HSL | hsl(212, 94%, 41%) |
| OKLCH | oklch(51.6% 0.18 257.1) |
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 #0663CC | 5.73:1 | AA | Lc -83.2 | Fine for body text |
| Black text on #0663CC | 3.66:1 | AA large text | Lc 26.2 | Dividers and decoration only |
| #0663CC text on white | 5.73:1 | AA | Lc 77.9 | Fine for body text |
| #0663CC text on black | 3.66:1 | AA large text | Lc -23.9 | 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 700.
-
Step 50
50
#F1F6FD
oklch(97.1% 0.011 256.7)
-
Step 100
100
#DFEBFB
oklch(93.6% 0.025 255.6)
-
Step 200
200
#C5DBFA
oklch(88.5% 0.049 256.9)
-
Step 300
300
#9DC3F9
oklch(80.9% 0.087 257.2)
-
Step 400
400
#65A2F6
oklch(70.7% 0.139 256.7)
-
Step 500
500
#3887F2
oklch(63% 0.178 257.1)
-
Step 600
600
#086EE1
oklch(55.6% 0.194 257)
-
Step 700
700 (this color)
#0663CC
oklch(51.6% 0.18 257.1)
-
Step 800
800
#034B9E
oklch(42.7% 0.149 257.1)
-
Step 900
900
#10407E
oklch(37.8% 0.117 257)
-
Step 950
950
#0C2649
oklch(27% 0.072 256.9)
#0663CC 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) | #166FD0 | 0.033 |
| Deuteranopia (no green cones) | #005ECA | 0.014 |
| Tritanopia (no blue cones) | #007D8E | 0.135 |
| Achromatopsia (no color) | #666666 | 0.180 |
Harmonies
Hue rotations in OKLCH that keep this color's lightness and chroma.
Complementary
The opposite hue (180°).
- #0663CC
#0663CC
oklch(51.6% 0.18 257.1)
- #8A5E00
#8A5E00
oklch(51.6% 0.108 77)
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 #0663CC, closest first.
Similar named colors
The eight closest entries in our named color list, with their ΔE distance.
- Mid Blue #276AB3 ΔE 0.048
- Azul #1D5DEC ΔE 0.052
- Royal Blue #4169E1 ΔE 0.054
- Cerulean Blue #056EEE ΔE 0.058
- Warm Blue #4B57DB ΔE 0.058
- Neon Blue #4361EE ΔE 0.066
- French Blue #436BAD ΔE 0.068
- Windows Blue #3778BF ΔE 0.072
Use #0663CC 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.