#4178DE
Closest named color: Royal Blue (#4169E1). oklch(58.8% 0.166 261.5), rgb(65, 120, 222).
Aa
Black text reads best on this color (4.96:1).
About this color
#4178DE is a medium-dark, vivid blue. In OKLCH its lightness is 59%, its chroma 0.166 and its hue 261°. Its hue sits on the cool side of the wheel. The nearest named color is Royal Blue (#4169E1), ΔE 0.039 away. Black text reads best on it, at 4.96:1.
| Hue family | Blues |
| Lightness | medium-dark (59%) |
| Chroma | vivid (0.166) |
| Temperature | cool |
| Nearest name | Royal Blue (#4169E1) |
| Black text | 4.96:1 |
| White text | 4.22:1 |
Values
| HEX | #4178DE |
| RGB | rgb(65, 120, 222) |
| HSL | hsl(219, 70%, 56%) |
| OKLCH | oklch(58.8% 0.166 261.5) |
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 #4178DE | 4.22:1 | AA large text | Lc -74.3 | Content text, not long reading |
| Black text on #4178DE | 4.96:1 | AA | Lc 35.3 | Non-text elements, placeholder text |
| #4178DE text on white | 4.22:1 | AA large text | Lc 68.8 | Content text, not long reading |
| #4178DE text on black | 4.96:1 | AA | Lc -32.8 | 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
#E2EAF9
oklch(93.5% 0.022 263.2)
-
Step 200
200
#CADAF5
oklch(88.5% 0.041 260.9)
-
Step 300
300
#A6C2F2
oklch(81% 0.075 261.1)
-
Step 400
400
#76A0EB
oklch(70.6% 0.12 261.5)
-
Step 500
500
#5386E5
oklch(63% 0.154 261.7)
-
Step 600
600 (this color)
#4178DE
oklch(58.8% 0.166 261.5)
-
Step 700
700
#2A5BB7
oklch(49% 0.155 261.5)
-
Step 800
800
#244B94
oklch(42.7% 0.128 261.5)
-
Step 900
900
#223F76
oklch(37.6% 0.1 261.9)
-
Step 950
950
#142545
oklch(26.9% 0.064 261.9)
#4178DE 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) | #4383E2 | 0.029 |
| Deuteranopia (no green cones) | #2074DC | 0.027 |
| Tritanopia (no blue cones) | #0090A0 | 0.133 |
| Achromatopsia (no color) | #7B7B7B | 0.166 |
Harmonies
Hue rotations in OKLCH that keep this color's lightness and chroma.
Complementary
The opposite hue (180°).
- #4178DE
#4178DE
oklch(58.8% 0.166 261.5)
- #A17400
#A17400
oklch(58.9% 0.121 81.5)
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 #4178DE, closest first.
Similar named colors
The eight closest entries in our named color list, with their ΔE distance.
- Royal Blue #4169E1 ΔE 0.039
- Clear Blue #247AFD ΔE 0.049
- Windows Blue #3778BF ΔE 0.050
- Cerulean Blue #056EEE ΔE 0.050
- Water Blue #0E87CC ΔE 0.057
- Dark Sky Blue #448EE4 ΔE 0.059
- Cornflower #6A79F7 ΔE 0.060
- Soft Blue #6488EA ΔE 0.061
Use #4178DE 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.