#0B66C2
Closest named color: Mid Blue (#276AB3). oklch(51.6% 0.163 254.8), rgb(11, 102, 194).
Aa
White text reads best on this color (5.68:1).
About this color
#0B66C2 is a medium-dark, vivid blue. In OKLCH its lightness is 52%, its chroma 0.163 and its hue 255°. Its hue sits on the cool side of the wheel. The nearest named color is Mid Blue (#276AB3), ΔE 0.030 away. White text reads best on it, at 5.68:1.
| Hue family | Blues |
| Lightness | medium-dark (52%) |
| Chroma | vivid (0.163) |
| Temperature | cool |
| Nearest name | Mid Blue (#276AB3) |
| Black text | 3.69:1 |
| White text | 5.68:1 |
Values
| HEX | #0B66C2 |
| RGB | rgb(11, 102, 194) |
| HSL | hsl(210, 89%, 40%) |
| OKLCH | oklch(51.6% 0.163 254.8) |
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 #0B66C2 | 5.68:1 | AA | Lc -83.1 | Fine for body text |
| Black text on #0B66C2 | 3.69:1 | AA large text | Lc 26.3 | Dividers and decoration only |
| #0B66C2 text on white | 5.68:1 | AA | Lc 77.8 | Fine for body text |
| #0B66C2 text on black | 3.69:1 | AA large text | Lc -24.0 | 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
#F1F6FD
oklch(97.1% 0.011 256.7)
-
Step 100
100
#E0EBF9
oklch(93.6% 0.022 254.4)
-
Step 200
200
#C6DBF6
oklch(88.4% 0.044 254.8)
-
Step 300
300
#9EC4F3
oklch(80.9% 0.078 254)
-
Step 400
400
#68A3EE
oklch(70.7% 0.127 255.1)
-
Step 500
500
#3B8AE8
oklch(63.1% 0.161 254.8)
-
Step 600
600
#0E71D6
oklch(55.5% 0.176 254.9)
-
Step 700
700 (this color)
#0B66C2
oklch(51.6% 0.163 254.8)
-
Step 800
800
#064E96
oklch(42.8% 0.134 254.5)
-
Step 900
900
#124178
oklch(37.6% 0.106 255.1)
-
Step 950
950
#0D2746
oklch(27.1% 0.066 254.6)
#0B66C2 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) | #306FC5 | 0.034 |
| Deuteranopia (no green cones) | #0060C0 | 0.017 |
| Tritanopia (no blue cones) | #007C8A | 0.121 |
| Achromatopsia (no color) | #676767 | 0.163 |
Harmonies
Hue rotations in OKLCH that keep this color's lightness and chroma.
Complementary
The opposite hue (180°).
- #0B66C2
#0B66C2
oklch(51.6% 0.163 254.8)
- #8C5D00
#8C5D00
oklch(51.6% 0.109 74.8)
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 #0B66C2, closest first.
Similar named colors
The eight closest entries in our named color list, with their ΔE distance.
- Mid Blue #276AB3 ΔE 0.030
- French Blue #436BAD ΔE 0.053
- Windows Blue #3778BF ΔE 0.060
- Royal Blue #4169E1 ΔE 0.062
- Flat Blue #3C73A8 ΔE 0.068
- Nice Blue #107AB0 ΔE 0.068
- Cerulean Blue #056EEE ΔE 0.070
- Warm Blue #4B57DB ΔE 0.070
Use #0B66C2 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.