#0664CB
Closest named color: Mid Blue (#276AB3). oklch(51.7% 0.178 256.6), rgb(6, 100, 203).
Aa
White text reads best on this color (5.68:1).
About this color
#0664CB is a medium-dark, vivid blue. In OKLCH its lightness is 52%, its chroma 0.178 and its hue 257°. Its hue sits on the cool side of the wheel. The nearest named color is Mid Blue (#276AB3), ΔE 0.045 away. White text reads best on it, at 5.68:1.
| Hue family | Blues |
| Lightness | medium-dark (52%) |
| Chroma | vivid (0.178) |
| Temperature | cool |
| Nearest name | Mid Blue (#276AB3) |
| Black text | 3.69:1 |
| White text | 5.68:1 |
Values
| HEX | #0664CB |
| RGB | rgb(6, 100, 203) |
| HSL | hsl(211, 94%, 41%) |
| OKLCH | oklch(51.7% 0.178 256.6) |
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 #0664CB | 5.68:1 | AA | Lc -83.0 | Fine for body text |
| Black text on #0664CB | 3.69:1 | AA large text | Lc 26.4 | Dividers and decoration only |
| #0664CB text on white | 5.68:1 | AA | Lc 77.7 | Fine for body text |
| #0664CB text on black | 3.69:1 | AA large text | Lc -24.1 | 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
#C5DBF9
oklch(88.5% 0.048 256.2)
-
Step 300
300
#9DC3F8
oklch(80.9% 0.086 256.8)
-
Step 400
400
#66A2F5
oklch(70.7% 0.137 256.8)
-
Step 500
500
#3888F1
oklch(63.1% 0.176 256.6)
-
Step 600
600
#076FDF
oklch(55.6% 0.19 256.5)
-
Step 700
700 (this color)
#0664CB
oklch(51.7% 0.178 256.6)
-
Step 800
800
#034C9D
oklch(42.8% 0.147 256.5)
-
Step 900
900
#10407D
oklch(37.7% 0.115 256.7)
-
Step 950
950
#0C2649
oklch(27% 0.072 256.9)
#0664CB 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) | #1D6FCF | 0.032 |
| Deuteranopia (no green cones) | #005FC9 | 0.014 |
| Tritanopia (no blue cones) | #007D8E | 0.132 |
| Achromatopsia (no color) | #676767 | 0.178 |
Harmonies
Hue rotations in OKLCH that keep this color's lightness and chroma.
Complementary
The opposite hue (180°).
- #0664CB
#0664CB
oklch(51.7% 0.178 256.6)
- #8B5E00
#8B5E00
oklch(51.7% 0.108 76.3)
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 #0664CB, closest first.
Similar named colors
The eight closest entries in our named color list, with their ΔE distance.
- Mid Blue #276AB3 ΔE 0.045
- Royal Blue #4169E1 ΔE 0.054
- Azul #1D5DEC ΔE 0.055
- Cerulean Blue #056EEE ΔE 0.058
- Warm Blue #4B57DB ΔE 0.060
- French Blue #436BAD ΔE 0.066
- Neon Blue #4361EE ΔE 0.068
- Windows Blue #3778BF ΔE 0.069
Use #0664CB 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.