#6370B2
Closest named color: French Blue (#436BAD). oklch(56.4% 0.103 274.2), rgb(99, 112, 178).
Aa
White text reads best on this color (4.67:1).
About this color
#6370B2 is a medium-dark, moderately saturated blue. In OKLCH its lightness is 56%, its chroma 0.103 and its hue 274°. Its hue sits on the cool side of the wheel. The nearest named color is French Blue (#436BAD), ΔE 0.044 away. White text reads best on it, at 4.67:1.
| Hue family | Blues |
| Lightness | medium-dark (56%) |
| Chroma | moderately saturated (0.103) |
| Temperature | cool |
| Nearest name | French Blue (#436BAD) |
| Black text | 4.49:1 |
| White text | 4.67:1 |
Values
| HEX | #6370B2 |
| RGB | rgb(99, 112, 178) |
| HSL | hsl(230, 34%, 54%) |
| OKLCH | oklch(56.4% 0.103 274.2) |
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 #6370B2 | 4.67:1 | AA | Lc -77.8 | Fine for body text |
| Black text on #6370B2 | 4.49:1 | AA large text | Lc 31.7 | Non-text elements, placeholder text |
| #6370B2 text on white | 4.67:1 | AA | Lc 72.4 | Content text, not long reading |
| #6370B2 text on black | 4.49:1 | AA large text | Lc -29.3 | 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
#F4F5FA
oklch(97.1% 0.007 277.2)
-
Step 100
100
#E7E9F3
oklch(93.5% 0.014 277.1)
-
Step 200
200
#D3D8EB
oklch(88.4% 0.027 274.1)
-
Step 300
300
#B7BFDF
oklch(80.9% 0.046 274.3)
-
Step 400
400
#929ED0
oklch(70.8% 0.075 273.9)
-
Step 500
500
#7885C3
oklch(63.1% 0.095 274.3)
-
Step 600
600 (this color)
#6370B2
oklch(56.4% 0.103 274.2)
-
Step 700
700
#505C97
oklch(49.2% 0.096 273.7)
-
Step 800
800
#424B7A
oklch(42.7% 0.079 274.4)
-
Step 900
900
#373F63
oklch(37.7% 0.063 273.5)
-
Step 950
950
#20253A
oklch(27% 0.04 273.2)
#6370B2 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) | #5877B5 | 0.022 |
| Deuteranopia (no green cones) | #5271B0 | 0.022 |
| Tritanopia (no blue cones) | #487D88 | 0.092 |
| Achromatopsia (no color) | #747474 | 0.103 |
Harmonies
Hue rotations in OKLCH that keep this color's lightness and chroma.
Complementary
The opposite hue (180°).
- #6370B2
#6370B2
oklch(56.4% 0.103 274.2)
- #89741F
#89741F
oklch(56.3% 0.104 94.5)
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 #6370B2, closest first.
Similar named colors
The eight closest entries in our named color list, with their ΔE distance.
- French Blue #436BAD ΔE 0.044
- Flat Blue #3C73A8 ΔE 0.049
- Windows Blue #3778BF ΔE 0.050
- Dull Blue #49759C ΔE 0.052
- Steel Blue #4682B4 ΔE 0.056
- Stormy Blue #507B9C ΔE 0.057
- Muted Blue #3B719F ΔE 0.057
- Cool Blue #4984B8 ΔE 0.058
Use #6370B2 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.