#677BC0
Closest named color: Cool Blue (#4984B8). oklch(59.7% 0.108 270.6), rgb(103, 123, 192).
Aa
Black text reads best on this color (5.17:1).
About this color
#677BC0 is a medium-dark, moderately saturated blue. In OKLCH its lightness is 60%, its chroma 0.108 and its hue 271°. Its hue sits on the cool side of the wheel. The nearest named color is Cool Blue (#4984B8), ΔE 0.043 away. Black text reads best on it, at 5.17:1.
| Hue family | Blues |
| Lightness | medium-dark (60%) |
| Chroma | moderately saturated (0.108) |
| Temperature | cool |
| Nearest name | Cool Blue (#4984B8) |
| Black text | 5.17:1 |
| White text | 4.06:1 |
Values
| HEX | #677BC0 |
| RGB | rgb(103, 123, 192) |
| HSL | hsl(227, 41%, 58%) |
| OKLCH | oklch(59.7% 0.108 270.6) |
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 #677BC0 | 4.06:1 | AA large text | Lc -73.2 | Content text, not long reading |
| Black text on #677BC0 | 5.17:1 | AA | Lc 36.3 | Non-text elements, placeholder text |
| #677BC0 text on white | 4.06:1 | AA large text | Lc 67.7 | Content text, not long reading |
| #677BC0 text on black | 5.17:1 | 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
#F3F5FA
oklch(97% 0.007 268.5)
-
Step 100
100
#E6EAF4
oklch(93.7% 0.014 268.5)
-
Step 200
200
#D2D9ED
oklch(88.6% 0.029 270.4)
-
Step 300
300
#B3C0E4
oklch(81% 0.053 269.6)
-
Step 400
400
#8C9ED6
oklch(70.6% 0.085 270.4)
-
Step 500
500 (this color)
#677BC0
oklch(59.7% 0.108 270.6)
-
Step 600
600
#5A6EB8
oklch(55.7% 0.117 270.8)
-
Step 700
700
#4A5C9E
oklch(49.2% 0.108 270.5)
-
Step 800
800
#3C4B80
oklch(42.6% 0.09 270.3)
-
Step 900
900
#333F67
oklch(37.7% 0.07 270.1)
-
Step 950
950
#1E253C
oklch(27% 0.044 270.3)
#677BC0 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) | #6282C3 | 0.019 |
| Deuteranopia (no green cones) | #597ABE | 0.018 |
| Tritanopia (no blue cones) | #468994 | 0.097 |
| Achromatopsia (no color) | #7E7E7E | 0.108 |
Harmonies
Hue rotations in OKLCH that keep this color's lightness and chroma.
Complementary
The opposite hue (180°).
- #677BC0
#677BC0
oklch(59.7% 0.108 270.6)
- #987C24
#987C24
oklch(59.7% 0.108 90.4)
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 #677BC0, closest first.
Similar named colors
The eight closest entries in our named color list, with their ΔE distance.
- Cool Blue #4984B8 ΔE 0.043
- Steel Blue #4682B4 ΔE 0.046
- Off Blue #5684AE ΔE 0.046
- Faded Blue #658CBB ΔE 0.050
- Dusty Blue #5A86AD ΔE 0.050
- Windows Blue #3778BF ΔE 0.053
- Stormy Blue #507B9C ΔE 0.065
- Soft Blue #6488EA ΔE 0.066
Use #677BC0 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.