#0A78EE
Closest named color: Cerulean Blue (#056EEE). oklch(58.7% 0.198 256.3), rgb(10, 120, 238).
Aa
Black text reads best on this color (4.93:1).
About this color
#0A78EE is a medium-dark, vivid blue. In OKLCH its lightness is 59%, its chroma 0.198 and its hue 256°. Its hue sits on the cool side of the wheel. The nearest named color is Cerulean Blue (#056EEE), ΔE 0.026 away. Black text reads best on it, at 4.93:1.
| Hue family | Blues |
| Lightness | medium-dark (59%) |
| Chroma | vivid (0.198) |
| Temperature | cool |
| Nearest name | Cerulean Blue (#056EEE) |
| Black text | 4.93:1 |
| White text | 4.25:1 |
Values
| HEX | #0A78EE |
| RGB | rgb(10, 120, 238) |
| HSL | hsl(211, 92%, 49%) |
| OKLCH | oklch(58.7% 0.198 256.3) |
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 #0A78EE | 4.25:1 | AA large text | Lc -74.1 | Content text, not long reading |
| Black text on #0A78EE | 4.93:1 | AA | Lc 35.5 | Non-text elements, placeholder text |
| #0A78EE text on white | 4.25:1 | AA large text | Lc 68.6 | Content text, not long reading |
| #0A78EE text on black | 4.93:1 | AA | Lc -33.0 | 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
#F0F6FE
oklch(97.1% 0.012 255.5)
-
Step 100
100
#DFEBFB
oklch(93.6% 0.025 255.6)
-
Step 200
200
#C4DBFA
oklch(88.4% 0.05 255.9)
-
Step 300
300
#9BC3FA
oklch(80.8% 0.089 256.5)
-
Step 400
400
#62A2F8
oklch(70.7% 0.143 256.3)
-
Step 500
500
#3188F4
oklch(63.1% 0.181 256)
-
Step 600
600 (this color)
#0A78EE
oklch(58.7% 0.198 256.3)
-
Step 700
700
#005DBE
oklch(49.2% 0.17 256.3)
-
Step 800
800
#004C9D
oklch(42.8% 0.147 256.2)
-
Step 900
900
#0B407F
oklch(37.8% 0.119 256.2)
-
Step 950
950
#0A264A
oklch(27% 0.075 256.3)
#0A78EE 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) | #2A85F2 | 0.038 |
| Deuteranopia (no green cones) | #0072EC | 0.016 |
| Tritanopia (no blue cones) | #0095A8 | 0.148 |
| Achromatopsia (no color) | #7B7B7B | 0.198 |
Harmonies
Hue rotations in OKLCH that keep this color's lightness and chroma.
Complementary
The opposite hue (180°).
- #0A78EE
#0A78EE
oklch(58.7% 0.198 256.3)
- #A57000
#A57000
oklch(58.6% 0.123 76.1)
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 #0A78EE, closest first.
No curated palette has a color within ΔE 0.04 of #0A78EE.
Similar named colors
The eight closest entries in our named color list, with their ΔE distance.
- Cerulean Blue #056EEE ΔE 0.026
- Clear Blue #247AFD ΔE 0.026
- Royal Blue #4169E1 ΔE 0.045
- Bright Blue #0165FC ΔE 0.052
- Neon Blue #4361EE ΔE 0.057
- Azul #1D5DEC ΔE 0.064
- Dodger Blue #1E90FF ΔE 0.067
- Water Blue #0E87CC ΔE 0.071
Use #0A78EE 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.