#4372D9
Closest named color: Royal Blue (#4169E1). oklch(57.3% 0.166 263.6), rgb(67, 114, 217).
Aa
Black text reads best on this color (4.64:1).
About this color
#4372D9 is a medium-dark, vivid blue. In OKLCH its lightness is 57%, its chroma 0.166 and its hue 264°. Its hue sits on the cool side of the wheel. The nearest named color is Royal Blue (#4169E1), ΔE 0.027 away. Black text reads best on it, at 4.64:1.
| Hue family | Blues |
| Lightness | medium-dark (57%) |
| Chroma | vivid (0.166) |
| Temperature | cool |
| Nearest name | Royal Blue (#4169E1) |
| Black text | 4.64:1 |
| White text | 4.51:1 |
Values
| HEX | #4372D9 |
| RGB | rgb(67, 114, 217) |
| HSL | hsl(221, 66%, 56%) |
| OKLCH | oklch(57.3% 0.166 263.6) |
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 #4372D9 | 4.51:1 | AA | Lc -76.5 | Fine for body text |
| Black text on #4372D9 | 4.64:1 | AA | Lc 33.1 | Non-text elements, placeholder text |
| #4372D9 text on white | 4.51:1 | AA | Lc 71.0 | Content text, not long reading |
| #4372D9 text on black | 4.64:1 | AA | Lc -30.7 | 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
#CBDAF5
oklch(88.6% 0.041 262.3)
-
Step 300
300
#A8C1F2
oklch(80.9% 0.075 263.7)
-
Step 400
400
#7A9FEB
oklch(70.7% 0.119 263.8)
-
Step 500
500
#5885E5
oklch(63% 0.153 263.7)
-
Step 600
600 (this color)
#4372D9
oklch(57.3% 0.166 263.6)
-
Step 700
700
#315AB7
oklch(49.1% 0.155 263.8)
-
Step 800
800
#294A94
oklch(42.7% 0.128 263.8)
-
Step 900
900
#253F76
oklch(37.8% 0.099 263.4)
-
Step 950
950
#162545
oklch(27% 0.063 263.8)
#4372D9 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) | #3B7EDD | 0.031 |
| Deuteranopia (no green cones) | #1570D7 | 0.032 |
| Tritanopia (no blue cones) | #008A9B | 0.134 |
| Achromatopsia (no color) | #767676 | 0.166 |
Harmonies
Hue rotations in OKLCH that keep this color's lightness and chroma.
Complementary
The opposite hue (180°).
- #4372D9
#4372D9
oklch(57.3% 0.166 263.6)
- #997100
#997100
oklch(57.3% 0.118 83.9)
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 #4372D9, closest first.
Similar named colors
The eight closest entries in our named color list, with their ΔE distance.
- Royal Blue #4169E1 ΔE 0.027
- Windows Blue #3778BF ΔE 0.047
- Cerulean Blue #056EEE ΔE 0.048
- Neon Blue #4361EE ΔE 0.054
- Clear Blue #247AFD ΔE 0.057
- Dark Periwinkle #665FD1 ΔE 0.058
- Warm Blue #4B57DB ΔE 0.065
- Water Blue #0E87CC ΔE 0.066
Use #4372D9 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.