#6578BC
Closest named color: Cool Blue (#4984B8). oklch(58.7% 0.107 271), rgb(101, 120, 188).
Aa
Black text reads best on this color (4.96:1).
About this color
#6578BC is a medium-dark, moderately saturated blue. In OKLCH its lightness is 59%, its chroma 0.107 and its hue 271°. Its hue sits on the cool side of the wheel. The nearest named color is Cool Blue (#4984B8), ΔE 0.044 away. Black text reads best on it, at 4.96:1.
| Hue family | Blues |
| Lightness | medium-dark (59%) |
| Chroma | moderately saturated (0.107) |
| Temperature | cool |
| Nearest name | Cool Blue (#4984B8) |
| Black text | 4.96:1 |
| White text | 4.22:1 |
Values
| HEX | #6578BC |
| RGB | rgb(101, 120, 188) |
| HSL | hsl(227, 39%, 57%) |
| OKLCH | oklch(58.7% 0.107 271) |
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 #6578BC | 4.22:1 | AA large text | Lc -74.6 | Content text, not long reading |
| Black text on #6578BC | 4.96:1 | AA | Lc 35.0 | Non-text elements, placeholder text |
| #6578BC text on white | 4.22:1 | AA large text | Lc 69.1 | Content text, not long reading |
| #6578BC 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
#B5C0E1
oklch(81% 0.048 270.8)
-
Step 400
400
#8F9ED1
oklch(70.6% 0.077 271.6)
-
Step 500
500
#7386C5
oklch(63.1% 0.098 270.6)
-
Step 600
600 (this color)
#6578BC
oklch(58.7% 0.107 271)
-
Step 700
700
#4C5C99
oklch(49% 0.1 271.2)
-
Step 800
800
#3E4C7C
oklch(42.8% 0.082 270.3)
-
Step 900
900
#353F64
oklch(37.6% 0.065 271.5)
-
Step 950
950
#1F253A
oklch(26.9% 0.04 271.3)
#6578BC 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) | #5F7FBF | 0.019 |
| Deuteranopia (no green cones) | #5778BA | 0.018 |
| Tritanopia (no blue cones) | #458691 | 0.095 |
| Achromatopsia (no color) | #7B7B7B | 0.107 |
Harmonies
Hue rotations in OKLCH that keep this color's lightness and chroma.
Complementary
The opposite hue (180°).
- #6578BC
#6578BC
oklch(58.7% 0.107 271)
- #947922
#947922
oklch(58.6% 0.107 90.8)
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 #6578BC, closest first.
Similar named colors
The eight closest entries in our named color list, with their ΔE distance.
- Cool Blue #4984B8 ΔE 0.044
- Steel Blue #4682B4 ΔE 0.046
- Off Blue #5684AE ΔE 0.047
- Windows Blue #3778BF ΔE 0.048
- Dusty Blue #5A86AD ΔE 0.052
- Faded Blue #658CBB ΔE 0.057
- Flat Blue #3C73A8 ΔE 0.060
- Stormy Blue #507B9C ΔE 0.060
Use #6578BC 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.