#0D78E4
Closest named color: Cerulean Blue (#056EEE). oklch(58% 0.185 255), rgb(13, 120, 228).
Aa
Black text reads best on this color (4.82:1).
About this color
#0D78E4 is a medium-dark, vivid blue. In OKLCH its lightness is 58%, its chroma 0.185 and its hue 255°. Its hue sits on the cool side of the wheel. The nearest named color is Cerulean Blue (#056EEE), ΔE 0.031 away. Black text reads best on it, at 4.82:1.
| Hue family | Blues |
| Lightness | medium-dark (58%) |
| Chroma | vivid (0.185) |
| Temperature | cool |
| Nearest name | Cerulean Blue (#056EEE) |
| Black text | 4.82:1 |
| White text | 4.35:1 |
Values
| HEX | #0D78E4 |
| RGB | rgb(13, 120, 228) |
| HSL | hsl(210, 89%, 47%) |
| OKLCH | oklch(58% 0.185 255) |
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 #0D78E4 | 4.35:1 | AA large text | Lc -74.9 | Content text, not long reading |
| Black text on #0D78E4 | 4.82:1 | AA | Lc 34.6 | Non-text elements, placeholder text |
| #0D78E4 text on white | 4.35:1 | AA large text | Lc 69.4 | Content text, not long reading |
| #0D78E4 text on black | 4.82:1 | AA | Lc -32.2 | 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
#F1F6FD
oklch(97.1% 0.011 256.7)
-
Step 100
100
#DFEBFA
oklch(93.6% 0.024 254)
-
Step 200
200
#C5DBF8
oklch(88.4% 0.047 255.4)
-
Step 300
300
#9CC4F6
oklch(80.9% 0.083 254.3)
-
Step 400
400
#64A3F2
oklch(70.7% 0.134 254.9)
-
Step 500
500
#3589ED
oklch(63% 0.17 255.1)
-
Step 600
600 (this color)
#0D78E4
oklch(58% 0.185 255)
-
Step 700
700
#005EB9
oklch(49% 0.162 255.1)
-
Step 800
800
#004D99
oklch(42.7% 0.14 255)
-
Step 900
900
#0E417B
oklch(37.8% 0.111 255.1)
-
Step 950
950
#0B2648
oklch(26.9% 0.071 255.8)
#0D78E4 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) | #3883E8 | 0.039 |
| Deuteranopia (no green cones) | #0071E2 | 0.019 |
| Tritanopia (no blue cones) | #0092A3 | 0.137 |
| Achromatopsia (no color) | #797979 | 0.185 |
Harmonies
Hue rotations in OKLCH that keep this color's lightness and chroma.
Complementary
The opposite hue (180°).
- #0D78E4
#0D78E4
oklch(58% 0.185 255)
- #A46E00
#A46E00
oklch(58% 0.122 75)
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 #0D78E4, closest first.
Similar named colors
The eight closest entries in our named color list, with their ΔE distance.
- Cerulean Blue #056EEE ΔE 0.031
- Clear Blue #247AFD ΔE 0.040
- Royal Blue #4169E1 ΔE 0.042
- Windows Blue #3778BF ΔE 0.059
- Water Blue #0E87CC ΔE 0.059
- Bright Blue #0165FC ΔE 0.061
- Neon Blue #4361EE ΔE 0.061
- Azul #1D5DEC ΔE 0.067
Use #0D78E4 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.