#4370B5
Closest named color: French Blue (#436BAD). oklch(54.6% 0.119 258.7), rgb(67, 112, 181).
Aa
White text reads best on this color (4.97:1).
About this color
#4370B5 is a medium-dark, moderately saturated blue. In OKLCH its lightness is 55%, its chroma 0.119 and its hue 259°. Its hue sits on the cool side of the wheel. The nearest named color is French Blue (#436BAD), ΔE 0.017 away. White text reads best on it, at 4.97:1.
| Hue family | Blues |
| Lightness | medium-dark (55%) |
| Chroma | moderately saturated (0.119) |
| Temperature | cool |
| Nearest name | French Blue (#436BAD) |
| Black text | 4.22:1 |
| White text | 4.97:1 |
Values
| HEX | #4370B5 |
| RGB | rgb(67, 112, 181) |
| HSL | hsl(216, 46%, 49%) |
| OKLCH | oklch(54.6% 0.119 258.7) |
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 #4370B5 | 4.97:1 | AA | Lc -79.6 | Fine for body text |
| Black text on #4370B5 | 4.22:1 | AA large text | Lc 29.9 | Dividers and decoration only |
| #4370B5 text on white | 4.97:1 | AA | Lc 74.2 | Content text, not long reading |
| #4370B5 text on black | 4.22:1 | AA large text | Lc -27.5 | Dividers and decoration only |
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
#F3F6FA
oklch(97.2% 0.006 255.5)
-
Step 100
100
#E4EAF5
oklch(93.6% 0.016 262.8)
-
Step 200
200
#CDDAED
oklch(88.4% 0.03 257.8)
-
Step 300
300
#ACC2E4
oklch(80.9% 0.054 259)
-
Step 400
400
#80A2D6
oklch(70.7% 0.085 258.7)
-
Step 500
500
#608ACB
oklch(63.1% 0.109 258.9)
-
Step 600
600 (this color)
#4370B5
oklch(54.6% 0.119 258.7)
-
Step 700
700
#37609F
oklch(49.1% 0.112 258.7)
-
Step 800
800
#2E4F81
oklch(42.8% 0.092 258.5)
-
Step 900
900
#294267
oklch(37.7% 0.071 258)
-
Step 950
950
#18273C
oklch(27% 0.044 256.9)
#4370B5 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) | #5276B8 | 0.025 |
| Deuteranopia (no green cones) | #426BB4 | 0.014 |
| Tritanopia (no blue cones) | #00808A | 0.100 |
| Achromatopsia (no color) | #707070 | 0.119 |
Harmonies
Hue rotations in OKLCH that keep this color's lightness and chroma.
Complementary
The opposite hue (180°).
- #4370B5
#4370B5
oklch(54.6% 0.119 258.7)
- #946700
#946700
oklch(54.7% 0.114 78.6)
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 #4370B5, closest first.
Similar named colors
The eight closest entries in our named color list, with their ΔE distance.
- French Blue #436BAD ΔE 0.017
- Windows Blue #3778BF ΔE 0.025
- Flat Blue #3C73A8 ΔE 0.025
- Mid Blue #276AB3 ΔE 0.032
- Muted Blue #3B719F ΔE 0.037
- Nice Blue #107AB0 ΔE 0.041
- Dull Blue #49759C ΔE 0.046
- Steel Blue #4682B4 ΔE 0.053
Use #4370B5 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.