#5370AC
Closest named color: French Blue (#436BAD). oklch(55% 0.1 263.8), rgb(83, 112, 172).
Aa
White text reads best on this color (4.90:1).
About this color
#5370AC is a medium-dark, moderately saturated blue. In OKLCH its lightness is 55%, its chroma 0.100 and its hue 264°. Its hue sits on the cool side of the wheel. The nearest named color is French Blue (#436BAD), ΔE 0.025 away. White text reads best on it, at 4.90:1.
| Hue family | Blues |
| Lightness | medium-dark (55%) |
| Chroma | moderately saturated (0.100) |
| Temperature | cool |
| Nearest name | French Blue (#436BAD) |
| Black text | 4.28:1 |
| White text | 4.90:1 |
Values
| HEX | #5370AC |
| RGB | rgb(83, 112, 172) |
| HSL | hsl(220, 35%, 50%) |
| OKLCH | oklch(55% 0.1 263.8) |
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 #5370AC | 4.90:1 | AA | Lc -79.3 | Fine for body text |
| Black text on #5370AC | 4.28:1 | AA large text | Lc 30.2 | Non-text elements, placeholder text |
| #5370AC text on white | 4.90:1 | AA | Lc 73.9 | Content text, not long reading |
| #5370AC text on black | 4.28:1 | AA large text | Lc -27.8 | 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
#F3F5FA
oklch(97% 0.007 268.5)
-
Step 100
100
#E5EAF3
oklch(93.6% 0.013 262.4)
-
Step 200
200
#D1D9EA
oklch(88.4% 0.025 265.6)
-
Step 300
300
#B2C1DF
oklch(80.9% 0.046 264.3)
-
Step 400
400
#8AA1CE
oklch(70.8% 0.071 263.6)
-
Step 500
500
#6D89C2
oklch(63.2% 0.092 263.9)
-
Step 600
600 (this color)
#5370AC
oklch(55% 0.1 263.8)
-
Step 700
700
#455F96
oklch(49.1% 0.094 264.1)
-
Step 800
800
#394E79
oklch(42.7% 0.077 263.7)
-
Step 900
900
#314162
oklch(37.7% 0.061 264)
-
Step 950
950
#1D2639
oklch(27% 0.038 264.5)
#5370AC 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) | #5975AE | 0.017 |
| Deuteranopia (no green cones) | #4E6DAB | 0.011 |
| Tritanopia (no blue cones) | #297D86 | 0.090 |
| Achromatopsia (no color) | #717171 | 0.100 |
Harmonies
Hue rotations in OKLCH that keep this color's lightness and chroma.
Complementary
The opposite hue (180°).
- #5370AC
#5370AC
oklch(55% 0.1 263.8)
- #8D6C1F
#8D6C1F
oklch(55% 0.1 84.2)
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 #5370AC, closest first.
Similar named colors
The eight closest entries in our named color list, with their ΔE distance.
- French Blue #436BAD ΔE 0.025
- Flat Blue #3C73A8 ΔE 0.026
- Dull Blue #49759C ΔE 0.034
- Muted Blue #3B719F ΔE 0.035
- Windows Blue #3778BF ΔE 0.039
- Stormy Blue #507B9C ΔE 0.046
- Cerulean #457B9D ΔE 0.046
- Mid Blue #276AB3 ΔE 0.049
Use #5370AC 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.