#6B78BB
Closest named color: Cool Blue (#4984B8). oklch(59.1% 0.104 274.4), rgb(107, 120, 187).
Aa
Black text reads best on this color (5.02:1).
About this color
#6B78BB is a medium-dark, moderately saturated blue. In OKLCH its lightness is 59%, its chroma 0.104 and its hue 274°. Its hue sits on the cool side of the wheel. The nearest named color is Cool Blue (#4984B8), ΔE 0.049 away. Black text reads best on it, at 5.02:1.
| Hue family | Blues |
| Lightness | medium-dark (59%) |
| Chroma | moderately saturated (0.104) |
| Temperature | cool |
| Nearest name | Cool Blue (#4984B8) |
| Black text | 5.02:1 |
| White text | 4.17:1 |
Values
| HEX | #6B78BB |
| RGB | rgb(107, 120, 187) |
| HSL | hsl(230, 37%, 58%) |
| OKLCH | oklch(59.1% 0.104 274.4) |
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 #6B78BB | 4.17:1 | AA large text | Lc -74.2 | Content text, not long reading |
| Black text on #6B78BB | 5.02:1 | AA | Lc 35.4 | Non-text elements, placeholder text |
| #6B78BB text on white | 4.17:1 | AA large text | Lc 68.7 | Content text, not long reading |
| #6B78BB text on black | 5.02:1 | AA | Lc -33.0 | 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
#E7E9F3
oklch(93.5% 0.014 277.1)
-
Step 200
200
#D4D8EB
oklch(88.5% 0.026 276.4)
-
Step 300
300
#B7BFDF
oklch(80.9% 0.046 274.3)
-
Step 400
400
#929DD0
oklch(70.6% 0.076 274.9)
-
Step 500
500
#7885C3
oklch(63.1% 0.095 274.3)
-
Step 600
600 (this color)
#6B78BB
oklch(59.1% 0.104 274.4)
-
Step 700
700
#505B97
oklch(49% 0.097 274.4)
-
Step 800
800
#424B7B
oklch(42.8% 0.08 274.5)
-
Step 900
900
#383F63
oklch(37.8% 0.062 274.7)
-
Step 950
950
#21253A
oklch(27.1% 0.04 275.2)
#6B78BB 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) | #617FBE | 0.021 |
| Deuteranopia (no green cones) | #5A79B9 | 0.022 |
| Tritanopia (no blue cones) | #518691 | 0.092 |
| Achromatopsia (no color) | #7C7C7C | 0.104 |
Harmonies
Hue rotations in OKLCH that keep this color's lightness and chroma.
Complementary
The opposite hue (180°).
- #6B78BB
#6B78BB
oklch(59.1% 0.104 274.4)
- #917C29
#917C29
oklch(59% 0.104 94.6)
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 #6B78BB, closest first.
Similar named colors
The eight closest entries in our named color list, with their ΔE distance.
- Cool Blue #4984B8 ΔE 0.049
- Off Blue #5684AE ΔE 0.049
- Steel Blue #4682B4 ΔE 0.051
- Dusty Blue #5A86AD ΔE 0.053
- Faded Blue #658CBB ΔE 0.056
- Windows Blue #3778BF ΔE 0.056
- Stormy Blue #507B9C ΔE 0.063
- Lavender Gray #7E7F9A ΔE 0.065
Use #6B78BB 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.