#677AC4
Closest named color: Cool Blue (#4984B8). oklch(59.7% 0.115 271.6), rgb(103, 122, 196).
Aa
Black text reads best on this color (5.15:1).
About this color
#677AC4 is a medium-dark, moderately saturated blue. In OKLCH its lightness is 60%, its chroma 0.115 and its hue 272°. Its hue sits on the cool side of the wheel. The nearest named color is Cool Blue (#4984B8), ΔE 0.048 away. Black text reads best on it, at 5.15:1.
| Hue family | Blues |
| Lightness | medium-dark (60%) |
| Chroma | moderately saturated (0.115) |
| Temperature | cool |
| Nearest name | Cool Blue (#4984B8) |
| Black text | 5.15:1 |
| White text | 4.07:1 |
Values
| HEX | #677AC4 |
| RGB | rgb(103, 122, 196) |
| HSL | hsl(228, 44%, 59%) |
| OKLCH | oklch(59.7% 0.115 271.6) |
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 #677AC4 | 4.07:1 | AA large text | Lc -73.3 | Content text, not long reading |
| Black text on #677AC4 | 5.15:1 | AA | Lc 36.3 | Non-text elements, placeholder text |
| #677AC4 text on white | 4.07:1 | AA large text | Lc 67.8 | Content text, not long reading |
| #677AC4 text on black | 5.15:1 | AA | Lc -33.9 | 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 500.
-
Step 50
50
#F3F5FB
oklch(97% 0.008 271.3)
-
Step 100
100
#E6E9F5
oklch(93.5% 0.016 274.8)
-
Step 200
200
#D1D8EF
oklch(88.4% 0.033 272.2)
-
Step 300
300
#B3BFE6
oklch(80.8% 0.057 271.7)
-
Step 400
400
#8C9DD9
oklch(70.6% 0.09 271.8)
-
Step 500
500 (this color)
#677AC4
oklch(59.7% 0.115 271.6)
-
Step 600
600
#5A6DBC
oklch(55.7% 0.124 271.6)
-
Step 700
700
#4A5AA2
oklch(49% 0.117 272)
-
Step 800
800
#3C4A83
oklch(42.6% 0.096 271.4)
-
Step 900
900
#333E69
oklch(37.6% 0.075 271.5)
-
Step 950
950
#1E253E
oklch(27.1% 0.048 271.1)
#677AC4 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) | #5E82C7 | 0.022 |
| Deuteranopia (no green cones) | #557AC2 | 0.022 |
| Tritanopia (no blue cones) | #438996 | 0.102 |
| Achromatopsia (no color) | #7E7E7E | 0.115 |
Harmonies
Hue rotations in OKLCH that keep this color's lightness and chroma.
Complementary
The opposite hue (180°).
- #677AC4
#677AC4
oklch(59.7% 0.115 271.6)
- #987C17
#987C17
oklch(59.6% 0.115 91.8)
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 #677AC4, closest first.
Similar named colors
The eight closest entries in our named color list, with their ΔE distance.
- Cool Blue #4984B8 ΔE 0.048
- Steel Blue #4682B4 ΔE 0.051
- Windows Blue #3778BF ΔE 0.053
- Off Blue #5684AE ΔE 0.053
- Faded Blue #658CBB ΔE 0.055
- Dusty Blue #5A86AD ΔE 0.057
- Soft Blue #6488EA ΔE 0.062
- Dark Sky Blue #448EE4 ΔE 0.068
Use #677AC4 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.