#0665B9
Closest named color: Mid Blue (#276AB3). oklch(50.6% 0.153 253), rgb(6, 101, 185).
Aa
White text reads best on this color (5.88:1).
About this color
#0665B9 is a medium-dark, vivid blue. In OKLCH its lightness is 51%, its chroma 0.153 and its hue 253°. Its hue sits on the cool side of the wheel. The nearest named color is Mid Blue (#276AB3), ΔE 0.024 away. White text reads best on it, at 5.88:1.
| Hue family | Blues |
| Lightness | medium-dark (51%) |
| Chroma | vivid (0.153) |
| Temperature | cool |
| Nearest name | Mid Blue (#276AB3) |
| Black text | 3.56:1 |
| White text | 5.88:1 |
Values
| HEX | #0665B9 |
| RGB | rgb(6, 101, 185) |
| HSL | hsl(208, 94%, 37%) |
| OKLCH | oklch(50.6% 0.153 253) |
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 #0665B9 | 5.88:1 | AA | Lc -84.0 | Fine for body text |
| Black text on #0665B9 | 3.56:1 | AA large text | Lc 25.3 | Dividers and decoration only |
| #0665B9 text on white | 5.88:1 | AA | Lc 78.8 | Fine for body text |
| #0665B9 text on black | 3.56:1 | AA large text | Lc -23.0 | 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
#F1F6FC
oklch(97.1% 0.01 252.8)
-
Step 100
100
#E0EBF8
oklch(93.6% 0.021 252.5)
-
Step 200
200
#C7DBF4
oklch(88.4% 0.041 254)
-
Step 300
300
#9FC4F0
oklch(80.9% 0.074 253.1)
-
Step 400
400
#69A4E9
oklch(70.7% 0.119 253.2)
-
Step 500
500
#3C8CE2
oklch(63.2% 0.151 252.8)
-
Step 600
600
#1073D0
oklch(55.5% 0.166 253.2)
-
Step 700
700 (this color)
#0665B9
oklch(50.6% 0.153 253)
-
Step 800
800
#074F92
oklch(42.7% 0.127 253.1)
-
Step 900
900
#134274
oklch(37.6% 0.099 253.2)
-
Step 950
950
#0D2744
oklch(27% 0.063 253.3)
#0665B9 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) | #376CBC | 0.036 |
| Deuteranopia (no green cones) | #075EB7 | 0.019 |
| Tritanopia (no blue cones) | #007986 | 0.112 |
| Achromatopsia (no color) | #646464 | 0.153 |
Harmonies
Hue rotations in OKLCH that keep this color's lightness and chroma.
Complementary
The opposite hue (180°).
- #0665B9
#0665B9
oklch(50.6% 0.153 253)
- #8A5900
#8A5900
oklch(50.6% 0.108 72.4)
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 #0665B9, closest first.
Similar named colors
The eight closest entries in our named color list, with their ΔE distance.
- Mid Blue #276AB3 ΔE 0.024
- French Blue #436BAD ΔE 0.049
- Peacock Blue #016795 ΔE 0.060
- Flat Blue #3C73A8 ΔE 0.063
- Ocean Blue #03719C ΔE 0.063
- Windows Blue #3778BF ΔE 0.063
- Nice Blue #107AB0 ΔE 0.065
- Denim Blue #3B5B92 ΔE 0.067
Use #0665B9 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.