#6379B9
Closest named color: Cool Blue (#4984B8). oklch(58.6% 0.102 268.7), rgb(99, 121, 185).
Aa
Black text reads best on this color (4.96:1).
About this color
#6379B9 is a medium-dark, moderately saturated blue. In OKLCH its lightness is 59%, its chroma 0.102 and its hue 269°. Its hue sits on the cool side of the wheel. The nearest named color is Cool Blue (#4984B8), ΔE 0.039 away. Black text reads best on it, at 4.96:1.
| Hue family | Blues |
| Lightness | medium-dark (59%) |
| Chroma | moderately saturated (0.102) |
| Temperature | cool |
| Nearest name | Cool Blue (#4984B8) |
| Black text | 4.96:1 |
| White text | 4.22:1 |
Values
| HEX | #6379B9 |
| RGB | rgb(99, 121, 185) |
| HSL | hsl(225, 38%, 56%) |
| OKLCH | oklch(58.6% 0.102 268.7) |
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 #6379B9 | 4.22:1 | AA large text | Lc -74.6 | Content text, not long reading |
| Black text on #6379B9 | 4.96:1 | AA | Lc 35.0 | Non-text elements, placeholder text |
| #6379B9 text on white | 4.22:1 | AA large text | Lc 69.1 | Content text, not long reading |
| #6379B9 text on black | 4.96:1 | AA | Lc -32.6 | 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
#F4F5FA
oklch(97.1% 0.007 277.2)
-
Step 100
100
#E6EAF3
oklch(93.7% 0.013 266.7)
-
Step 200
200
#D2D9EB
oklch(88.5% 0.026 268.8)
-
Step 300
300
#B4C0DF
oklch(80.9% 0.046 268.6)
-
Step 400
400
#8D9FCF
oklch(70.6% 0.073 268.5)
-
Step 500
500
#7287C3
oklch(63.1% 0.094 268.9)
-
Step 600
600 (this color)
#6379B9
oklch(58.6% 0.102 268.7)
-
Step 700
700
#4A5D97
oklch(49% 0.096 268.9)
-
Step 800
800
#3D4D7A
oklch(42.8% 0.078 268.2)
-
Step 900
900
#344062
oklch(37.7% 0.061 268.6)
-
Step 950
950
#1E263A
oklch(27.1% 0.039 267.1)
#6379B9 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) | #627FBC | 0.016 |
| Deuteranopia (no green cones) | #5978B8 | 0.013 |
| Tritanopia (no blue cones) | #428690 | 0.091 |
| Achromatopsia (no color) | #7B7B7B | 0.102 |
Harmonies
Hue rotations in OKLCH that keep this color's lightness and chroma.
Complementary
The opposite hue (180°).
- #6379B9
#6379B9
oklch(58.6% 0.102 268.7)
- #957829
#957829
oklch(58.6% 0.102 88.2)
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 #6379B9, closest first.
Similar named colors
The eight closest entries in our named color list, with their ΔE distance.
- Cool Blue #4984B8 ΔE 0.039
- Steel Blue #4682B4 ΔE 0.040
- Off Blue #5684AE ΔE 0.041
- Dusty Blue #5A86AD ΔE 0.046
- Windows Blue #3778BF ΔE 0.047
- Faded Blue #658CBB ΔE 0.053
- Stormy Blue #507B9C ΔE 0.054
- Flat Blue #3C73A8 ΔE 0.056
Use #6379B9 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.