#677BC3
Closest named color: Cool Blue (#4984B8). oklch(59.9% 0.113 270.9), rgb(103, 123, 195).
Aa
Black text reads best on this color (5.19:1).
About this color
#677BC3 is a medium-dark, moderately saturated blue. In OKLCH its lightness is 60%, its chroma 0.113 and its hue 271°. Its hue sits on the cool side of the wheel. The nearest named color is Cool Blue (#4984B8), ΔE 0.046 away. Black text reads best on it, at 5.19:1.
| Hue family | Blues |
| Lightness | medium-dark (60%) |
| Chroma | moderately saturated (0.113) |
| Temperature | cool |
| Nearest name | Cool Blue (#4984B8) |
| Black text | 5.19:1 |
| White text | 4.04:1 |
Values
| HEX | #677BC3 |
| RGB | rgb(103, 123, 195) |
| HSL | hsl(227, 43%, 58%) |
| OKLCH | oklch(59.9% 0.113 270.9) |
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 #677BC3 | 4.04:1 | AA large text | Lc -73.1 | Content text, not long reading |
| Black text on #677BC3 | 5.19:1 | AA | Lc 36.5 | Non-text elements, placeholder text |
| #677BC3 text on white | 4.04:1 | AA large text | Lc 67.5 | Content text, not long reading |
| #677BC3 text on black | 5.19:1 | AA | Lc -34.1 | 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
#E6EAF5
oklch(93.7% 0.015 270)
-
Step 200
200
#D1D9EE
oklch(88.6% 0.03 269.1)
-
Step 300
300
#B3BFE5
oklch(80.8% 0.055 271.4)
-
Step 400
400
#8C9ED8
oklch(70.7% 0.088 270.8)
-
Step 500
500 (this color)
#677BC3
oklch(59.9% 0.113 270.9)
-
Step 600
600
#596DBB
oklch(55.6% 0.123 271.1)
-
Step 700
700
#495BA1
oklch(49.1% 0.114 270.8)
-
Step 800
800
#3C4B82
oklch(42.8% 0.093 270.6)
-
Step 900
900
#333F69
oklch(37.8% 0.074 270.5)
-
Step 950
950
#1E253D
oklch(27% 0.046 270.7)
#677BC3 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) | #6083C6 | 0.022 |
| Deuteranopia (no green cones) | #577BC1 | 0.020 |
| Tritanopia (no blue cones) | #448A96 | 0.100 |
| Achromatopsia (no color) | #7E7E7E | 0.113 |
Harmonies
Hue rotations in OKLCH that keep this color's lightness and chroma.
Complementary
The opposite hue (180°).
- #677BC3
#677BC3
oklch(59.9% 0.113 270.9)
- #997C1D
#997C1D
oklch(59.8% 0.112 90.6)
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 #677BC3, closest first.
Similar named colors
The eight closest entries in our named color list, with their ΔE distance.
- Cool Blue #4984B8 ΔE 0.046
- Steel Blue #4682B4 ΔE 0.049
- Off Blue #5684AE ΔE 0.050
- Faded Blue #658CBB ΔE 0.052
- Windows Blue #3778BF ΔE 0.053
- Dusty Blue #5A86AD ΔE 0.054
- Soft Blue #6488EA ΔE 0.062
- Water Blue #0E87CC ΔE 0.067
Use #677BC3 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.