#677CC8
Closest named color: Cool Blue (#4984B8). oklch(60.4% 0.118 270.8), rgb(103, 124, 200).
Aa
Black text reads best on this color (5.29:1).
About this color
#677CC8 is a medium-dark, moderately saturated blue. In OKLCH its lightness is 60%, its chroma 0.118 and its hue 271°. 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 5.29:1.
| Hue family | Blues |
| Lightness | medium-dark (60%) |
| Chroma | moderately saturated (0.118) |
| Temperature | cool |
| Nearest name | Cool Blue (#4984B8) |
| Black text | 5.29:1 |
| White text | 3.96:1 |
Values
| HEX | #677CC8 |
| RGB | rgb(103, 124, 200) |
| HSL | hsl(227, 47%, 59%) |
| OKLCH | oklch(60.4% 0.118 270.8) |
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 #677CC8 | 3.96:1 | AA large text | Lc -72.4 | Content text, not long reading |
| Black text on #677CC8 | 5.29:1 | AA | Lc 37.2 | Non-text elements, placeholder text |
| #677CC8 text on white | 3.96:1 | AA large text | Lc 66.9 | Content text, not long reading |
| #677CC8 text on black | 5.29:1 | AA | Lc -34.8 | 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
#E5EAF5
oklch(93.6% 0.016 266.3)
-
Step 200
200
#D1D9EF
oklch(88.6% 0.031 269.8)
-
Step 300
300
#B2BFE7
oklch(80.8% 0.058 270.9)
-
Step 400
400
#8B9EDB
oklch(70.8% 0.092 270.6)
-
Step 500
500 (this color)
#677CC8
oklch(60.4% 0.118 270.8)
-
Step 600
600
#586DBE
oklch(55.7% 0.128 270.8)
-
Step 700
700
#485AA4
oklch(49% 0.12 271.1)
-
Step 800
800
#3B4A85
oklch(42.7% 0.099 270.9)
-
Step 900
900
#323E6B
oklch(37.6% 0.079 270.9)
-
Step 950
950
#1D253E
oklch(27% 0.048 269.5)
#677CC8 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) | #5F84CB | 0.022 |
| Deuteranopia (no green cones) | #557CC6 | 0.022 |
| Tritanopia (no blue cones) | #408C98 | 0.106 |
| Achromatopsia (no color) | #808080 | 0.119 |
Harmonies
Hue rotations in OKLCH that keep this color's lightness and chroma.
Complementary
The opposite hue (180°).
- #677CC8
#677CC8
oklch(60.4% 0.118 270.8)
- #9C7E12
#9C7E12
oklch(60.5% 0.119 91.2)
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 #677CC8, closest first.
Similar named colors
The eight closest entries in our named color list, with their ΔE distance.
- Cool Blue #4984B8 ΔE 0.049
- Faded Blue #658CBB ΔE 0.053
- Steel Blue #4682B4 ΔE 0.053
- Off Blue #5684AE ΔE 0.055
- Soft Blue #6488EA ΔE 0.055
- Windows Blue #3778BF ΔE 0.056
- Dusty Blue #5A86AD ΔE 0.058
- Dark Sky Blue #448EE4 ΔE 0.062
Use #677CC8 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.