#4377E4
Closest named color: Royal Blue (#4169E1). oklch(59.1% 0.175 263), rgb(67, 119, 228).
Aa
Black text reads best on this color (4.99:1).
About this color
#4377E4 is a medium-dark, vivid blue. In OKLCH its lightness is 59%, its chroma 0.175 and its hue 263°. Its hue sits on the cool side of the wheel. The nearest named color is Royal Blue (#4169E1), ΔE 0.036 away. Black text reads best on it, at 4.99:1.
| Hue family | Blues |
| Lightness | medium-dark (59%) |
| Chroma | vivid (0.175) |
| Temperature | cool |
| Nearest name | Royal Blue (#4169E1) |
| Black text | 4.99:1 |
| White text | 4.20:1 |
Values
| HEX | #4377E4 |
| RGB | rgb(67, 119, 228) |
| HSL | hsl(221, 75%, 58%) |
| OKLCH | oklch(59.1% 0.175 263) |
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 #4377E4 | 4.20:1 | AA large text | Lc -74.1 | Content text, not long reading |
| Black text on #4377E4 | 4.99:1 | AA | Lc 35.5 | Non-text elements, placeholder text |
| #4377E4 text on white | 4.20:1 | AA large text | Lc 68.6 | Content text, not long reading |
| #4377E4 text on black | 4.99:1 | AA | Lc -33.1 | 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
#F2F6FD
oklch(97.2% 0.01 261.8)
-
Step 100
100
#E2EAFA
oklch(93.6% 0.023 264.5)
-
Step 200
200
#CADAF7
oklch(88.5% 0.044 262.4)
-
Step 300
300
#A6C1F4
oklch(80.9% 0.078 262.9)
-
Step 400
400
#769FEF
oklch(70.6% 0.126 262.9)
-
Step 500
500
#5485EA
oklch(63.2% 0.161 263.1)
-
Step 600
600 (this color)
#4377E4
oklch(59.1% 0.175 263)
-
Step 700
700
#2C59BB
oklch(49% 0.163 263.2)
-
Step 800
800
#254A98
oklch(42.8% 0.135 262.9)
-
Step 900
900
#223E79
oklch(37.6% 0.106 263.2)
-
Step 950
950
#142547
oklch(27% 0.067 262.7)
#4377E4 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) | #3B83E8 | 0.030 |
| Deuteranopia (no green cones) | #0875E2 | 0.033 |
| Tritanopia (no blue cones) | #0091A2 | 0.141 |
| Achromatopsia (no color) | #7C7C7C | 0.175 |
Harmonies
Hue rotations in OKLCH that keep this color's lightness and chroma.
Complementary
The opposite hue (180°).
- #4377E4
#4377E4
oklch(59.1% 0.175 263)
- #A07500
#A07500
oklch(59% 0.121 82.8)
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 #4377E4, closest first.
Similar named colors
The eight closest entries in our named color list, with their ΔE distance.
- Royal Blue #4169E1 ΔE 0.036
- Clear Blue #247AFD ΔE 0.041
- Cerulean Blue #056EEE ΔE 0.046
- Cornflower #6A79F7 ΔE 0.054
- Neon Blue #4361EE ΔE 0.057
- Windows Blue #3778BF ΔE 0.059
- Soft Blue #6488EA ΔE 0.060
- Dark Sky Blue #448EE4 ΔE 0.061
Use #4377E4 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.