#0B73E1
Closest named color: Cerulean Blue (#056EEE). oklch(56.7% 0.188 255.9), rgb(11, 115, 225).
Aa
White text reads best on this color (4.61:1).
About this color
#0B73E1 is a medium-dark, vivid blue. In OKLCH its lightness is 57%, its chroma 0.188 and its hue 256°. Its hue sits on the cool side of the wheel. The nearest named color is Cerulean Blue (#056EEE), ΔE 0.024 away. White text reads best on it, at 4.61:1.
| Hue family | Blues |
| Lightness | medium-dark (57%) |
| Chroma | vivid (0.188) |
| Temperature | cool |
| Nearest name | Cerulean Blue (#056EEE) |
| Black text | 4.55:1 |
| White text | 4.61:1 |
Values
| HEX | #0B73E1 |
| RGB | rgb(11, 115, 225) |
| HSL | hsl(211, 91%, 46%) |
| OKLCH | oklch(56.7% 0.188 255.9) |
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 #0B73E1 | 4.61:1 | AA | Lc -76.8 | Fine for body text |
| Black text on #0B73E1 | 4.55:1 | AA | Lc 32.8 | Non-text elements, placeholder text |
| #0B73E1 text on white | 4.61:1 | AA | Lc 71.3 | Content text, not long reading |
| #0B73E1 text on black | 4.55:1 | AA | Lc -30.4 | 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
#9DC3F7
oklch(80.8% 0.085 256.3)
-
Step 400
400
#65A2F3
oklch(70.6% 0.135 256)
-
Step 500
500
#3789EF
oklch(63.2% 0.172 255.8)
-
Step 600
600 (this color)
#0B73E1
oklch(56.7% 0.188 255.9)
-
Step 700
700
#005DBC
oklch(49% 0.167 256)
-
Step 800
800
#014C9B
oklch(42.6% 0.144 255.9)
-
Step 900
900
#0F407B
oklch(37.5% 0.113 255.9)
-
Step 950
950
#0B2648
oklch(26.9% 0.071 255.8)
#0B73E1 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) | #2D7EE5 | 0.035 |
| Deuteranopia (no green cones) | #006DDF | 0.016 |
| Tritanopia (no blue cones) | #008E9F | 0.141 |
| Achromatopsia (no color) | #757575 | 0.188 |
Harmonies
Hue rotations in OKLCH that keep this color's lightness and chroma.
Complementary
The opposite hue (180°).
- #0B73E1
#0B73E1
oklch(56.7% 0.188 255.9)
- #9E6B00
#9E6B00
oklch(56.7% 0.119 76)
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 #0B73E1, closest first.
Similar named colors
The eight closest entries in our named color list, with their ΔE distance.
- Cerulean Blue #056EEE ΔE 0.024
- Royal Blue #4169E1 ΔE 0.035
- Clear Blue #247AFD ΔE 0.047
- Neon Blue #4361EE ΔE 0.054
- Bright Blue #0165FC ΔE 0.054
- Azul #1D5DEC ΔE 0.056
- Windows Blue #3778BF ΔE 0.059
- Water Blue #0E87CC ΔE 0.068
Use #0B73E1 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.