#4178DB
Closest named color: Royal Blue (#4169E1). oklch(58.6% 0.162 261.1), rgb(65, 120, 219).
Aa
Black text reads best on this color (4.93:1).
About this color
#4178DB is a medium-dark, vivid blue. In OKLCH its lightness is 59%, its chroma 0.162 and its hue 261°. Its hue sits on the cool side of the wheel. The nearest named color is Royal Blue (#4169E1), ΔE 0.040 away. Black text reads best on it, at 4.93:1.
| Hue family | Blues |
| Lightness | medium-dark (59%) |
| Chroma | vivid (0.162) |
| Temperature | cool |
| Nearest name | Royal Blue (#4169E1) |
| Black text | 4.93:1 |
| White text | 4.25:1 |
Values
| HEX | #4178DB |
| RGB | rgb(65, 120, 219) |
| HSL | hsl(219, 68%, 56%) |
| OKLCH | oklch(58.6% 0.162 261.1) |
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 #4178DB | 4.25:1 | AA large text | Lc -74.5 | Content text, not long reading |
| Black text on #4178DB | 4.93:1 | AA | Lc 35.0 | Non-text elements, placeholder text |
| #4178DB text on white | 4.25:1 | AA large text | Lc 69.1 | Content text, not long reading |
| #4178DB text on black | 4.93:1 | AA | Lc -32.6 | 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
#F2F6FC
oklch(97.2% 0.009 258.3)
-
Step 100
100
#E2EAF8
oklch(93.5% 0.021 261.8)
-
Step 200
200
#CADAF5
oklch(88.5% 0.041 260.9)
-
Step 300
300
#A6C2F1
oklch(81% 0.073 260.7)
-
Step 400
400
#77A0E9
oklch(70.6% 0.117 261.4)
-
Step 500
500
#5387E3
oklch(63.1% 0.15 261)
-
Step 600
600 (this color)
#4178DB
oklch(58.6% 0.162 261.1)
-
Step 700
700
#2B5CB5
oklch(49.1% 0.151 261.2)
-
Step 800
800
#244C92
oklch(42.8% 0.124 260.7)
-
Step 900
900
#224075
oklch(37.8% 0.098 260.9)
-
Step 950
950
#142644
oklch(27% 0.061 260.1)
#4178DB 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) | #4682DF | 0.028 |
| Deuteranopia (no green cones) | #2674D9 | 0.024 |
| Tritanopia (no blue cones) | #008F9F | 0.129 |
| Achromatopsia (no color) | #7B7B7B | 0.162 |
Harmonies
Hue rotations in OKLCH that keep this color's lightness and chroma.
Complementary
The opposite hue (180°).
- #4178DB
#4178DB
oklch(58.6% 0.162 261.1)
- #A07300
#A07300
oklch(58.6% 0.121 81.3)
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 #4178DB, closest first.
Similar named colors
The eight closest entries in our named color list, with their ΔE distance.
- Royal Blue #4169E1 ΔE 0.040
- Windows Blue #3778BF ΔE 0.045
- Clear Blue #247AFD ΔE 0.053
- Cerulean Blue #056EEE ΔE 0.053
- Water Blue #0E87CC ΔE 0.054
- Dark Sky Blue #448EE4 ΔE 0.059
- Soft Blue #6488EA ΔE 0.063
- Cornflower #6A79F7 ΔE 0.064
Use #4178DB 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.