#6378BA
Closest named color: Cool Blue (#4984B8). oklch(58.5% 0.105 269.6), rgb(99, 120, 186).
Aa
Black text reads best on this color (4.92:1).
About this color
#6378BA is a medium-dark, moderately saturated blue. In OKLCH its lightness is 58%, its chroma 0.105 and its hue 270°. Its hue sits on the cool side of the wheel. The nearest named color is Cool Blue (#4984B8), ΔE 0.042 away. Black text reads best on it, at 4.92:1.
| Hue family | Blues |
| Lightness | medium-dark (58%) |
| Chroma | moderately saturated (0.105) |
| Temperature | cool |
| Nearest name | Cool Blue (#4984B8) |
| Black text | 4.92:1 |
| White text | 4.26:1 |
Values
| HEX | #6378BA |
| RGB | rgb(99, 120, 186) |
| HSL | hsl(226, 39%, 56%) |
| OKLCH | oklch(58.5% 0.105 269.6) |
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 #6378BA | 4.26:1 | AA large text | Lc -74.9 | Content text, not long reading |
| Black text on #6378BA | 4.92:1 | AA | Lc 34.7 | Non-text elements, placeholder text |
| #6378BA text on white | 4.26:1 | AA large text | Lc 69.4 | Content text, not long reading |
| #6378BA text on black | 4.92:1 | AA | Lc -32.3 | 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
#B4C0E0
oklch(80.9% 0.047 269.1)
-
Step 400
400
#8E9FD0
oklch(70.7% 0.075 269.6)
-
Step 500
500
#7286C4
oklch(63% 0.097 269.8)
-
Step 600
600 (this color)
#6378BA
oklch(58.5% 0.105 269.6)
-
Step 700
700
#4B5D98
oklch(49.1% 0.097 269.7)
-
Step 800
800
#3D4C7B
oklch(42.6% 0.081 269.4)
-
Step 900
900
#344063
oklch(37.8% 0.062 268.9)
-
Step 950
950
#1F253A
oklch(26.9% 0.04 271.3)
#6378BA 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) | #607FBD | 0.019 |
| Deuteranopia (no green cones) | #5777B9 | 0.016 |
| Tritanopia (no blue cones) | #428690 | 0.094 |
| Achromatopsia (no color) | #7A7A7A | 0.105 |
Harmonies
Hue rotations in OKLCH that keep this color's lightness and chroma.
Complementary
The opposite hue (180°).
- #6378BA
#6378BA
oklch(58.5% 0.105 269.6)
- #947825
#947825
oklch(58.4% 0.104 89.5)
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 #6378BA, closest first.
Similar named colors
The eight closest entries in our named color list, with their ΔE distance.
- Cool Blue #4984B8 ΔE 0.042
- Steel Blue #4682B4 ΔE 0.043
- Off Blue #5684AE ΔE 0.044
- Windows Blue #3778BF ΔE 0.046
- Dusty Blue #5A86AD ΔE 0.049
- Flat Blue #3C73A8 ΔE 0.056
- Faded Blue #658CBB ΔE 0.056
- Stormy Blue #507B9C ΔE 0.056
Use #6378BA 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.