#0664C4
Closest named color: Mid Blue (#276AB3). oklch(51.2% 0.169 255.5), rgb(6, 100, 196).
Aa
White text reads best on this color (5.78:1).
About this color
#0664C4 is a medium-dark, vivid blue. In OKLCH its lightness is 51%, its chroma 0.169 and its hue 256°. Its hue sits on the cool side of the wheel. The nearest named color is Mid Blue (#276AB3), ΔE 0.037 away. White text reads best on it, at 5.78:1.
| Hue family | Blues |
| Lightness | medium-dark (51%) |
| Chroma | vivid (0.169) |
| Temperature | cool |
| Nearest name | Mid Blue (#276AB3) |
| Black text | 3.62:1 |
| White text | 5.78:1 |
Values
| HEX | #0664C4 |
| RGB | rgb(6, 100, 196) |
| HSL | hsl(210, 94%, 40%) |
| OKLCH | oklch(51.2% 0.169 255.5) |
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 #0664C4 | 5.78:1 | AA | Lc -83.5 | Fine for body text |
| Black text on #0664C4 | 3.62:1 | AA large text | Lc 25.8 | Dividers and decoration only |
| #0664C4 text on white | 5.78:1 | AA | Lc 78.2 | Fine for body text |
| #0664C4 text on black | 3.62:1 | AA large text | Lc -23.6 | 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
#E0EBFA
oklch(93.6% 0.024 256.1)
-
Step 200
200
#C6DBF7
oklch(88.5% 0.045 255.6)
-
Step 300
300
#9EC3F5
oklch(80.8% 0.082 256.1)
-
Step 400
400
#67A3F0
oklch(70.7% 0.13 255.3)
-
Step 500
500
#3A89EB
oklch(63% 0.166 255.6)
-
Step 600
600
#0B70DA
oklch(55.5% 0.182 255.7)
-
Step 700
700 (this color)
#0664C4
oklch(51.2% 0.169 255.5)
-
Step 800
800
#054D99
oklch(42.7% 0.14 255.5)
-
Step 900
900
#11417A
oklch(37.8% 0.109 255.5)
-
Step 950
950
#0C2647
oklch(26.9% 0.069 255.8)
#0664C4 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) | #286EC8 | 0.034 |
| Deuteranopia (no green cones) | #005EC2 | 0.017 |
| Tritanopia (no blue cones) | #007C8A | 0.128 |
| Achromatopsia (no color) | #656565 | 0.169 |
Harmonies
Hue rotations in OKLCH that keep this color's lightness and chroma.
Complementary
The opposite hue (180°).
- #0664C4
#0664C4
oklch(51.2% 0.169 255.5)
- #8A5C00
#8A5C00
oklch(51.2% 0.108 75.1)
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 #0664C4, closest first.
Similar named colors
The eight closest entries in our named color list, with their ΔE distance.
- Mid Blue #276AB3 ΔE 0.037
- French Blue #436BAD ΔE 0.059
- Royal Blue #4169E1 ΔE 0.062
- Azul #1D5DEC ΔE 0.065
- Warm Blue #4B57DB ΔE 0.066
- Windows Blue #3778BF ΔE 0.066
- Cerulean Blue #056EEE ΔE 0.068
- Flat Blue #3C73A8 ΔE 0.074
Use #0664C4 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.