#0078CE
Closest named color: Windows Blue (#3778BF). oklch(56.4% 0.159 249.9), rgb(0, 120, 206).
Aa
White text reads best on this color (4.58:1).
About this color
#0078CE is a medium-dark, vivid blue. In OKLCH its lightness is 56%, its chroma 0.159 and its hue 250°. Its hue sits on the cool side of the wheel. The nearest named color is Windows Blue (#3778BF), ΔE 0.031 away. White text reads best on it, at 4.58:1.
| Hue family | Blues |
| Lightness | medium-dark (56%) |
| Chroma | vivid (0.159) |
| Temperature | cool |
| Nearest name | Windows Blue (#3778BF) |
| Black text | 4.57:1 |
| White text | 4.58:1 |
Values
| HEX | #0078CE |
| RGB | rgb(0, 120, 206) |
| HSL | hsl(205, 100%, 40%) |
| OKLCH | oklch(56.4% 0.159 249.9) |
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 #0078CE | 4.58:1 | AA | Lc -76.6 | Fine for body text |
| Black text on #0078CE | 4.57:1 | AA | Lc 32.9 | Non-text elements, placeholder text |
| #0078CE text on white | 4.58:1 | AA | Lc 71.1 | Content text, not long reading |
| #0078CE text on black | 4.57:1 | AA | Lc -30.5 | Non-text elements, placeholder text |
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 600.
-
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
#C6DCF3
oklch(88.5% 0.04 249.5)
-
Step 300
300
#9EC5EE
oklch(81% 0.072 250)
-
Step 400
400
#66A5E5
oklch(70.6% 0.115 250.1)
-
Step 500
500
#368DDE
oklch(63% 0.147 250.1)
-
Step 600
600 (this color)
#0078CE
oklch(56.4% 0.159 249.9)
-
Step 700
700
#0063AB
oklch(49.2% 0.138 249.7)
-
Step 800
800
#00518D
oklch(42.7% 0.12 249.5)
-
Step 900
900
#0E4372
oklch(37.6% 0.096 250.3)
-
Step 950
950
#0B2843
oklch(27.1% 0.061 249.8)
#0078CE 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) | #4B7ED1 | 0.047 |
| Deuteranopia (no green cones) | #286ECC | 0.027 |
| Tritanopia (no blue cones) | #008D99 | 0.115 |
| Achromatopsia (no color) | #757575 | 0.159 |
Harmonies
Hue rotations in OKLCH that keep this color's lightness and chroma.
Complementary
The opposite hue (180°).
- #0078CE
#0078CE
oklch(56.4% 0.159 249.9)
- #A26600
#A26600
oklch(56.2% 0.122 69.8)
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 #0078CE, closest first.
Similar named colors
The eight closest entries in our named color list, with their ΔE distance.
- Windows Blue #3778BF ΔE 0.031
- Water Blue #0E87CC ΔE 0.044
- Nice Blue #107AB0 ΔE 0.049
- Mid Blue #276AB3 ΔE 0.051
- Royal Blue #4169E1 ΔE 0.058
- Cerulean Blue #056EEE ΔE 0.058
- Flat Blue #3C73A8 ΔE 0.061
- French Blue #436BAD ΔE 0.061
Use #0078CE 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.